Date   

Re: 600gto for astrophotography

Stephen E. Russell <sjruss55@...>
 

Thanks for the info. Gus, looks like the best of both worlds.
Stephen

-----Original Message-----
From: Paul Gustafson <drgus@erols.com>
To: ap-gto@egroups.com <ap-gto@egroups.com>
Date: Friday, March 17, 2000 2:08 PM
Subject: [ap-gto] Re: 600gto for astrophotography


Even if I buy the 54in pier, maybe you can just buy the center
section only.
AP said I could buy the 48" pier only (the base, legs, and tension rods are
the same), and a new set of turnbuckles to use with my current tension
rods.
Roland said with their 10" Mak-Cass on a 900, the 48" pier was just right.

Gus


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Re: 600gto for astrophotography

Stephen E. Russell <sjruss55@...>
 

Hi Bobby,
Thats exactly why I bought the guidescope.
Thanks for the response.
Stephen



I'm speaking a bit out-of-turn here because I don't use guidescopes only
off-axis guiders; but you should do just fine with the 60mm guidescope. The
glory of the guidescope is its ability to be tweeked independently of the
imaging scope. So the smaller apreture shouldn't ever be a problem since
you
will have so much flexability in finding guidestars.
Bobby Middleton


Re: 600gto for astrophotography

Stephen E. Russell <sjruss55@...>
 

Hi Bob,

I bought that 60mm GS from AP three years ago for the SDF and 130. With a
Tak 5mm Guide eyepiece, I'm at 140x, which does begin to get dim for
guiding. I'll try to keep within the FOV AMAP, good tip. The 140x works out
to be about 5x the focal length in inches with the 130f6, so it looks like I
should use 200+ with the 155f7. May have to upgrade as you say.

For all you ST4 users, isn't the 60mm GS adequate for autoguiding for 155f7?
Eventually I'll have to get one, but I want to experience the pain of manual
guiding for now anyway.

Thanks, Stephen



A 60mm guidescope can certainly work for manual guiding, though my
preference
has been 80mm. I prefer to select a guidestar that is within the
field of the image, to minimize the chances of field rotation (good polar
alignment is important). An 80mm just gives you a brighter selection of
stars,
at a high enough magnification (200X or higher) to make guiding easier.

In any case, a 60mm guidescope is pretty cheap and you can always upgrade
later.


Bob Luffel


Re: 600gto for astrophotography

Paul Gustafson <drgus@...>
 

Even if I buy the 54in pier, maybe you can just buy the center
section only.
AP said I could buy the 48" pier only (the base, legs, and tension rods are
the same), and a new set of turnbuckles to use with my current tension rods.
Roland said with their 10" Mak-Cass on a 900, the 48" pier was just right.

Gus


Re: 600gto for astrophotography

Stephen E. Russell <sjruss55@...>
 

Hi Dave,
I'll give AP a call to get the details on the tension rods.
Thanks, thought you interchange the piers since legs were the same.

Stephen




Stephen,
Yes you can buy the pier post only. I have a 900GTO and a 54" pier and
bought a 42" pier section with tension rods. You probably could get away
with only one set of rods, depending on the heights. I plan on using the
54"
pier with a refractor and the 42" pier with a SCT.

Dave Messier


Re: 600gto for astrophotography

Stephen E. Russell <sjruss55@...>
 

Hi Gus,
Thanks for the input. I figured that most folks use the 48in pier. I set up
my tripod at 54in with the 130f6 to get a feel for it. Crawling on my knees
and trying to guide manually is uncomfortable. Maybe easier to stand, I
guess you need to choose objects that allow you to sit is the key, easier
said than done. Even though the 155f7 is longer, the guidescope still will
remain at the same position, so I need to consider this some more. I can
see where the 80mm GS would be easier to use just because it is longer. Time
to bring out the stepstool for the shorter observers would solve the horizon
problem, except when they grab on the diagonal to get their balance. I don't
have any future plans for a shorter scope, if so then I will have to use the
tripod. Even if I buy the 54in pier, maybe you can just buy the center
section only.
Stephen

I'm 6'2" tall and use the 155 EDFS/900GTO combo (a little taller than the
600, I believe) on the 54" pier. I can view to the horizon standing and can
view at the zenith without crawling on my knees. It's quite doable, but if
you have any observing friends any shorter, it will be too tall when
viewing
near the horizon. And you won't be doing much viewing seated. If you plan
on
using a shorter scope on the mount/pier combo, I'd go for the 48". Since I
will be using a C-11 and a Mak-Cass on mine, I am going to sell the 54" and
go to a 48".

Gus


Re: Should I select 900GTO or 1200GTO?

Rich N. <rnapo@...>
 

I use a case something like the Pelican case for
my 400. I bought the AP case/box for the 400/600,
but I found it too bulky and too slow. It requires you
to bolt the mount into a ring on the bottom of the case.
I bought this case several years ago from AP.

Maybe AP will switch to a Pellican type case?

Rich


I hope you don't mind my piggy-backing on your question about a Pelican
case for the 600. I'm waiting for delivery of a 400GTO and was wondering
whether anyone uses a Pelican to transport this mount. At present A-P
doesn't have a case for the 400 in stock.

Thanks for your input,

Jim

On Fri, 17 Mar 2000, Bob Luffel wrote:

Hi Ron,

I would be interested in hearing what problems/fixes you had with your
600GTO (so that those of us with 600s know what to keep an eye out for).
The prior 600E QMD I owned worked flawlessly (and my new 600E GTO has
been
great).

I had a chance to use an EM200 mount this past Astrofest for the first
time,
it will be interesting to hear your experienced comparison to the 600.

Which Pelican case do you pack your 600 into? (I have the A-P case, but
a padded pelican would probably be an even more convenient way to go).


Bob Luffel



The 600E is a very solid mount, and as you noted the 400 can carry a
much
heavier load than you expect. I've done successful astrophotography
with
both mounts, and have done so with scopes that were well outside the
design
range of both mounts. And gotten swell pictures anyway. <g> I've used
8" and
9" SCTs and Cassegrains on both the 400 and 600 with great results, and
those have been at some very long focal lengths (up to f/33 and 7000mm
for
planetary photography, and that was right out there at the edge of what
these fine mounts can do).

I had some problems with my 600 GTO, and it recently came back from AP
much
improved. It's now like a tank, and I think Roland has changed the
specs on
the 600 mounts so that they are more robust. With the changes, the 600
GTO
is very good photographic platform. I've taken some excellent images
with it
lately (http://www.wodaski.com) with my 5" refractor. I recently
acquired an
EM-200 mount, and will be doing some side-by-side comparisons between
the
two to see how they shape up.

The 600 GTO is extremely portable, which is its main attraction for me.
I
bought a large Pelican case into which I can fit all mount components,
and I
can transport and set up quickly.

Ron Wodaski

-----Original Message-----
From: John Gleason [mailto:dvj@earthlink.net]
Sent: Thursday, March 16, 2000 7:32 PM
To: ap-gto@egroups.com
Subject: [ap-gto] Re: Should I select 900GTO or 1200GTO?


Don't rule out the AP goto 600 mount. If you are not too serious about
astrophotography and have the AP155 with the 2.7" focuser, I would
suggest
the 600 as a best all around mount for portability and support of the
6".
I have used the entire AP QMD mount product line and was very surprised
to
see just how well the 600 supported even the 155 EDF for serious visual
observation. I mounted the AP 400 once to a standard Losmandy Pier
and
even went as far to put the 155 EDF on it. Not recommended, but it did
support the telescope for visual work at my great surprise.

If on the otherhand you are obsessed with catching photons on film or
silicon, I wouldn't use anything less then the 900.

Happy choosing!

John Gleason, dvj@earthlink.net
http://www.celestialimage.com



----------
From: N. Foldager <nf@dadlnet.dk>
To: ap-gto@egroups.com
Subject: [ap-gto] Should I select 900GTO or 1200GTO?
Date: Thursday, March 16, 2000 8:32 AM

I would like someday to purchase an AP 155 Starfire, but for
economical reasons I have to start with the mount, and wait with the
scope. (In the meantime, I will use a good, homebuilt 4" doublet).

But should I select a 900GTO or a GTO-1200 mount?

One big problem is that I am several thousands kilometers away from
the showrooms; so I need your help.

If I had a permanent observation site, I would undoubtly select the
GTO-1200. However, as for now, I do not have a permanent site. I hope
to get one within some years. Until then, I will have to transport
the equipment in my (compact) car every time.

Paul Gustafson has a 900GTO and kindly gave me some clues to this
problem. I would like, however, to supplement with the opinions from
other users; in particular 1200GTO owners who have to transport their
mount by car to the observation site.

Would you think that the 1200GTO is too big and heavy for me in the
situation described above?

If I purchase a 900GTO, will I regret that I did not select the
1200GTO the day where I have a permanent site and maybe want to add
another scope or more equipment?

Also, I understand that the 1200GTO needs a pier where the 900GTO can
do with a tripod. Right? That means that I have to include the weight
and volume drawbacks of a pier versus a tripod when I consider
portability of these two mounts.

I very much appreciate any comments on this.

Best regards,

Niels Foldager
Copenhagen
Denmark
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Re: Should I select 900GTO or 1200GTO?

jim runsdorf
 

I hope you don't mind my piggy-backing on your question about a Pelican
case for the 600. I'm waiting for delivery of a 400GTO and was wondering
whether anyone uses a Pelican to transport this mount. At present A-P
doesn't have a case for the 400 in stock.

Thanks for your input,

Jim

On Fri, 17 Mar 2000, Bob Luffel wrote:

Hi Ron,

I would be interested in hearing what problems/fixes you had with your
600GTO (so that those of us with 600s know what to keep an eye out for).
The prior 600E QMD I owned worked flawlessly (and my new 600E GTO has been
great).

I had a chance to use an EM200 mount this past Astrofest for the first time,
it will be interesting to hear your experienced comparison to the 600.

Which Pelican case do you pack your 600 into? (I have the A-P case, but
a padded pelican would probably be an even more convenient way to go).


Bob Luffel



The 600E is a very solid mount, and as you noted the 400 can carry a much
heavier load than you expect. I've done successful astrophotography with
both mounts, and have done so with scopes that were well outside the design
range of both mounts. And gotten swell pictures anyway. <g> I've used 8" and
9" SCTs and Cassegrains on both the 400 and 600 with great results, and
those have been at some very long focal lengths (up to f/33 and 7000mm for
planetary photography, and that was right out there at the edge of what
these fine mounts can do).

I had some problems with my 600 GTO, and it recently came back from AP much
improved. It's now like a tank, and I think Roland has changed the specs on
the 600 mounts so that they are more robust. With the changes, the 600 GTO
is very good photographic platform. I've taken some excellent images with it
lately (http://www.wodaski.com) with my 5" refractor. I recently acquired an
EM-200 mount, and will be doing some side-by-side comparisons between the
two to see how they shape up.

The 600 GTO is extremely portable, which is its main attraction for me. I
bought a large Pelican case into which I can fit all mount components, and I
can transport and set up quickly.

Ron Wodaski

-----Original Message-----
From: John Gleason [mailto:dvj@earthlink.net]
Sent: Thursday, March 16, 2000 7:32 PM
To: ap-gto@egroups.com
Subject: [ap-gto] Re: Should I select 900GTO or 1200GTO?


Don't rule out the AP goto 600 mount. If you are not too serious about
astrophotography and have the AP155 with the 2.7" focuser, I would suggest
the 600 as a best all around mount for portability and support of the 6".
I have used the entire AP QMD mount product line and was very surprised to
see just how well the 600 supported even the 155 EDF for serious visual
observation. I mounted the AP 400 once to a standard Losmandy Pier and
even went as far to put the 155 EDF on it. Not recommended, but it did
support the telescope for visual work at my great surprise.

If on the otherhand you are obsessed with catching photons on film or
silicon, I wouldn't use anything less then the 900.

Happy choosing!

John Gleason, dvj@earthlink.net
http://www.celestialimage.com



----------
From: N. Foldager <nf@dadlnet.dk>
To: ap-gto@egroups.com
Subject: [ap-gto] Should I select 900GTO or 1200GTO?
Date: Thursday, March 16, 2000 8:32 AM

I would like someday to purchase an AP 155 Starfire, but for
economical reasons I have to start with the mount, and wait with the
scope. (In the meantime, I will use a good, homebuilt 4" doublet).

But should I select a 900GTO or a GTO-1200 mount?

One big problem is that I am several thousands kilometers away from
the showrooms; so I need your help.

If I had a permanent observation site, I would undoubtly select the
GTO-1200. However, as for now, I do not have a permanent site. I hope
to get one within some years. Until then, I will have to transport
the equipment in my (compact) car every time.

Paul Gustafson has a 900GTO and kindly gave me some clues to this
problem. I would like, however, to supplement with the opinions from
other users; in particular 1200GTO owners who have to transport their
mount by car to the observation site.

Would you think that the 1200GTO is too big and heavy for me in the
situation described above?

If I purchase a 900GTO, will I regret that I did not select the
1200GTO the day where I have a permanent site and maybe want to add
another scope or more equipment?

Also, I understand that the 1200GTO needs a pier where the 900GTO can
do with a tripod. Right? That means that I have to include the weight
and volume drawbacks of a pier versus a tripod when I consider
portability of these two mounts.

I very much appreciate any comments on this.

Best regards,

Niels Foldager
Copenhagen
Denmark

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Re: Should I select 900GTO or 1200GTO?

N. Foldager
 

Jeff wrote:

This is one of those times a digital picture would be a 1000 words.
Yes. I would love to see a picture of the 1200 GTO with a person on
it to get the scale. In the AP brochure, the other pictures have it,
but not the 1200-picture.

Best regards,

Niels


Re: Should I select 900GTO or 1200GTO?

Rich N. <rnapo@...>
 

"Rich N." wrote:
<SNIP>
You need to be sure the "Az screws" will fit over the projection
<snip>
the mount on the base plate easier.
This is one of those times a digital picture would be a 1000 words.
Jeff

On the AP website you can see a drawing of the top
of the pier, for a 900, with the base plate attached.
Click on "mounts", then "pier accessory tray".

If you look at the photos and drawings of the 900 mount,
the base plate is attached to the mount. However, that plate is
shipped from AP attached to the pier. Same for the 1200.

http://www.astro-physics.com/

Rich


Re: Should I select 900GTO or 1200GTO?

N. Foldager
 

Thank you so much to all of you for your kind answers.

Before I retract to make my decision, I have two more questions:

The specs for the 1200 states a capacity of 140 lb.
What is the capacity for the 900?

Is pointing and tracking accuracy the same for those two mounts?


Best regards,

Niels


Re: 600gto for astrophotography

Paul Gustafson <drgus@...>
 

I've the 6oogto with 130f6 and use a 60mm guide scope combo. I'm new at
this game and have only tried 15 min. shots so far. I'm using the
wooden tripod for now. When I move up to the 155f7 EDFS I understand
the 900 would be a much more stable platform. To get the most out of
the 6oo mount I will get the pier. AP is sold out of 48in piers for a
couple of months, so I was wondering if anybody is using the 54in pier
with the 600gto/155f7 combo? I'm 6ft tall, but wonder if the 54in pier
will be too tall?
I'm 6'2" tall and use the 155 EDFS/900GTO combo (a little taller than the
600, I believe) on the 54" pier. I can view to the horizon standing and can
view at the zenith without crawling on my knees. It's quite doable, but if
you have any observing friends any shorter, it will be too tall when viewing
near the horizon. And you won't be doing much viewing seated. If you plan on
using a shorter scope on the mount/pier combo, I'd go for the 48". Since I
will be using a C-11 and a Mak-Cass on mine, I am going to sell the 54" and
go to a 48".

Gus


Re: Should I select 900GTO or 1200GTO?

Bob Luffel <bluffel@...>
 

Sounds like it just needed adjustment of the worm to worm gear distance. My
new 600GTO has both 600X and 1200X speeds.

That must be a pretty hefty setup, all packed into one case
Thanks for the info.

Bob


My 600 GTO would stall out at 1200x with a 20-pound load, even if it was
balanced. The mount came back with what sounds like heftier motors and a
slower top speed (600x instead of 1200x), and works great; slews like a
tank. <g>

I have the Pelican 1650. It has big wheels on one end, handles on three
sides, and the mount takes up about 2/3rds of the interior, leaving room for
other stuff (counterweights, cwt shaft, controllers, etc.). It's a SUPER
case for the 600 GTO. I wouldn't hesitate to put it on an airline; that's
about as happy as I get with a case.

Ron Wodaski

-----Original Message-----
From: Bob Luffel [mailto:bluffel@nukin.gr.hp.com]
Sent: Friday, March 17, 2000 9:38 AM
To: ap-gto@egroups.com
Subject: [ap-gto] Re: Should I select 900GTO or 1200GTO?


Hi Ron,

I would be interested in hearing what problems/fixes you had with your
600GTO (so that those of us with 600s know what to keep an eye out for).
The prior 600E QMD I owned worked flawlessly (and my new 600E GTO has been
great).

I had a chance to use an EM200 mount this past Astrofest for the first time,
it will be interesting to hear your experienced comparison to the 600.

Which Pelican case do you pack your 600 into? (I have the A-P case, but
a padded pelican would probably be an even more convenient way to go).


Bob Luffel



The 600E is a very solid mount, and as you noted the 400 can carry a much
heavier load than you expect. I've done successful astrophotography with
both mounts, and have done so with scopes that were well outside the
design
range of both mounts. And gotten swell pictures anyway. <g> I've used 8"
and
9" SCTs and Cassegrains on both the 400 and 600 with great results, and
those have been at some very long focal lengths (up to f/33 and 7000mm for
planetary photography, and that was right out there at the edge of what
these fine mounts can do).

I had some problems with my 600 GTO, and it recently came back from AP
much
improved. It's now like a tank, and I think Roland has changed the specs
on
the 600 mounts so that they are more robust. With the changes, the 600 GTO
is very good photographic platform. I've taken some excellent images with
it
lately (http://www.wodaski.com) with my 5" refractor. I recently acquired
an
EM-200 mount, and will be doing some side-by-side comparisons between the
two to see how they shape up.

The 600 GTO is extremely portable, which is its main attraction for me. I
bought a large Pelican case into which I can fit all mount components, and
I
can transport and set up quickly.

Ron Wodaski

-----Original Message-----
From: John Gleason [mailto:dvj@earthlink.net]
Sent: Thursday, March 16, 2000 7:32 PM
To: ap-gto@egroups.com
Subject: [ap-gto] Re: Should I select 900GTO or 1200GTO?


Don't rule out the AP goto 600 mount. If you are not too serious about
astrophotography and have the AP155 with the 2.7" focuser, I would suggest
the 600 as a best all around mount for portability and support of the 6".
I have used the entire AP QMD mount product line and was very surprised to
see just how well the 600 supported even the 155 EDF for serious visual
observation. I mounted the AP 400 once to a standard Losmandy Pier and
even went as far to put the 155 EDF on it. Not recommended, but it did
support the telescope for visual work at my great surprise.

If on the otherhand you are obsessed with catching photons on film or
silicon, I wouldn't use anything less then the 900.

Happy choosing!

John Gleason, dvj@earthlink.net
http://www.celestialimage.com



----------
From: N. Foldager <nf@dadlnet.dk>
To: ap-gto@egroups.com
Subject: [ap-gto] Should I select 900GTO or 1200GTO?
Date: Thursday, March 16, 2000 8:32 AM

I would like someday to purchase an AP 155 Starfire, but for
economical reasons I have to start with the mount, and wait with the
scope. (In the meantime, I will use a good, homebuilt 4" doublet).

But should I select a 900GTO or a GTO-1200 mount?

One big problem is that I am several thousands kilometers away from
the showrooms; so I need your help.

If I had a permanent observation site, I would undoubtly select the
GTO-1200. However, as for now, I do not have a permanent site. I hope
to get one within some years. Until then, I will have to transport
the equipment in my (compact) car every time.

Paul Gustafson has a 900GTO and kindly gave me some clues to this
problem. I would like, however, to supplement with the opinions from
other users; in particular 1200GTO owners who have to transport their
mount by car to the observation site.

Would you think that the 1200GTO is too big and heavy for me in the
situation described above?

If I purchase a 900GTO, will I regret that I did not select the
1200GTO the day where I have a permanent site and maybe want to add
another scope or more equipment?

Also, I understand that the 1200GTO needs a pier where the 900GTO can
do with a tripod. Right? That means that I have to include the weight
and volume drawbacks of a pier versus a tripod when I consider
portability of these two mounts.

I very much appreciate any comments on this.

Best regards,

Niels Foldager
Copenhagen
Denmark

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Re: Should I select 900GTO or 1200GTO?

Jeffrey D. Gortatowsky <mrrockets@...>
 

"Rich N." wrote:
<SNIP>
You need to be sure the "Az screws" will fit over the projection
<snip>
the mount on the base plate easier.
This is one of those times a digital picture would be a 1000 words.
Jeff


Re: 600gto for astrophotography

DPMESSIER@...
 

In a message dated 3/17/2000 2:38:25 PM Eastern Standard Time,
sjruss55@dpc.net writes:

Time
to bring out the stepstool for the shorter observers would solve the
horizon
problem, except when they grab on the diagonal to get their balance. I
don't
have any future plans for a shorter scope, if so then I will have to use
the
tripod. Even if I buy the 54in pier, maybe you can just buy the center
section only.
Stephen
Stephen,
Yes you can buy the pier post only. I have a 900GTO and a 54" pier and
bought a 42" pier section with tension rods. You probably could get away
with only one set of rods, depending on the heights. I plan on using the 54"
pier with a refractor and the 42" pier with a SCT.

Dave Messier

David P. Messier
http://members.aol.com/dpmessier/


Re: 600gto for astrophotography

Bob Luffel <bluffel@...>
 

Sounds like you have it well in hand already.

I use a Celestron (vixen) 80mm f/11 and ST4 with my 155EDF.
At f/11 I generally have had no problem finding suitable guidestars within
the field. I like to have a bright enough star so I can keep the ST4 exposures
at or below 1 second. Assuming that your 60mm guidescope is f/11 it should
work just as well, just at a shorter focal length (but with the 130 f/6 you
will have a similar guidescope/mainscope focal length relationship).

Enjoy the manual guiding! I used to be more of a 'purist' and manually
guided, but I got used to auto guiding surprisingly fast :-) (still, the
set up time and hassles are the same for autoguiding and manual guiding).
What the ST4 really bought me is the ability to do something (like observe)
while taking an exposure. That is what my Traveler gets used a lot for (as
a second scope to use while the 155 is humming away).

Oh yeah, one more thing I learned. Stick with simple guidescope rings, they
work well. I once tried a Tak TGM-2 guidescope stage (basically a teegul
mount). It flexed like crazy and was actually a pain to use (lots of shift
in the axis' when adjusting).


Bob


Hi Bob,

I bought that 60mm GS from AP three years ago for the SDF and 130. With a
Tak 5mm Guide eyepiece, I'm at 140x, which does begin to get dim for
guiding. I'll try to keep within the FOV AMAP, good tip. The 140x works out
to be about 5x the focal length in inches with the 130f6, so it looks like I
should use 200+ with the 155f7. May have to upgrade as you say.

For all you ST4 users, isn't the 60mm GS adequate for autoguiding for 155f7?
Eventually I'll have to get one, but I want to experience the pain of manual
guiding for now anyway.

Thanks, Stephen



A 60mm guidescope can certainly work for manual guiding, though my
preference
has been 80mm. I prefer to select a guidestar that is within the
field of the image, to minimize the chances of field rotation (good polar
alignment is important). An 80mm just gives you a brighter selection of
stars,
at a high enough magnification (200X or higher) to make guiding easier.

In any case, a 60mm guidescope is pretty cheap and you can always upgrade
later.


Bob Luffel



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Re: Should I select 900GTO or 1200GTO?

Ray Gralak <ray@...>
 

Hi Ray and everyone:

I am on the list to order a 900, but I may reconsider. My problem is
not weight--I can carry my 18" dob or 65# 12" solid tube with no
problem. Unfortunately, lowering the 27# head exactly straight down
into the tripod is all I can handle. If I am a bit off the head sticks
into the tripod obliquely and has to be yanked out. I am afraid that
the 47# 1200 RA head will do the same thing. Can you lower it in
without a problem, and can you bench more than 200# :-)
Hi Derek,

All I do is "hug" the 1200's RA head and place it on top
of the pier. If you get too tall of a pier it might be
a lot harder to get it on top of the pier. I always make
sure to lift straight up from my legs to not put stress
on my back (I haven't injured anything yet!) And no,
I'm not a weightlifter, just a software engineer. :-)

Take care,

-Ray Gralak


Re: 600gto for astrophotography

Bobby Middleton <bobm@...>
 

I'm speaking a bit out-of-turn here because I don't use guidescopes only
off-axis guiders; but you should do just fine with the 60mm guidescope. The
glory of the guidescope is its ability to be tweeked independently of the
imaging scope. So the smaller apreture shouldn't ever be a problem since you
will have so much flexability in finding guidestars.
Bobby Middleton

http://www.koyote.com/users/bobm/astro1.htm

Assuming only 35mm format and lets say winds no more than 5mph, what is
your definition of casual vs. serious astrophotgraphy limits? I'm sure
I fall into the casual catagory since more than 75% of my time is
visual. If I have the paitence I would like to work my way up to 60min.
manually guided shots.
Can I get by with the 60mm guide scope with the 155 for manual guiding?
I would appreciate any comments on this setup.
Stephen


Re: 600gto for astrophotography

Bob Luffel <bluffel@...>
 

A 60mm guidescope can certainly work for manual guiding, though my preference
has been 80mm. I prefer to select a guidestar that is within the
field of the image, to minimize the chances of field rotation (good polar
alignment is important). An 80mm just gives you a brighter selection of stars,
at a high enough magnification (200X or higher) to make guiding easier.

In any case, a 60mm guidescope is pretty cheap and you can always upgrade later.


Bob Luffel


Hello fellow astrophotographers,
I've the 6oogto with 130f6 and use a 60mm guide scope combo. I'm new at
this game and have only tried 15 min. shots so far. I'm using the
wooden tripod for now. When I move up to the 155f7 EDFS I understand
the 900 would be a much more stable platform. To get the most out of
the 6oo mount I will get the pier. AP is sold out of 48in piers for a
couple of months, so I was wondering if anybody is using the 54in pier
with the 600gto/155f7 combo? I'm 6ft tall, but wonder if the 54in pier
will be too tall?
Assuming only 35mm format and lets say winds no more than 5mph, what is
your definition of casual vs. serious astrophotgraphy limits? I'm sure
I fall into the casual catagory since more than 75% of my time is
visual. If I have the paitence I would like to work my way up to 60min.
manually guided shots.
Can I get by with the 60mm guide scope with the 155 for manual guiding?
I would appreciate any comments on this setup.
Stephen


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Re: Should I select 900GTO or 1200GTO?

Bob Luffel <bluffel@...>
 

Hi Ron,

I would be interested in hearing what problems/fixes you had with your
600GTO (so that those of us with 600s know what to keep an eye out for).
The prior 600E QMD I owned worked flawlessly (and my new 600E GTO has been
great).

I had a chance to use an EM200 mount this past Astrofest for the first time,
it will be interesting to hear your experienced comparison to the 600.

Which Pelican case do you pack your 600 into? (I have the A-P case, but
a padded pelican would probably be an even more convenient way to go).


Bob Luffel


The 600E is a very solid mount, and as you noted the 400 can carry a much
heavier load than you expect. I've done successful astrophotography with
both mounts, and have done so with scopes that were well outside the design
range of both mounts. And gotten swell pictures anyway. <g> I've used 8" and
9" SCTs and Cassegrains on both the 400 and 600 with great results, and
those have been at some very long focal lengths (up to f/33 and 7000mm for
planetary photography, and that was right out there at the edge of what
these fine mounts can do).

I had some problems with my 600 GTO, and it recently came back from AP much
improved. It's now like a tank, and I think Roland has changed the specs on
the 600 mounts so that they are more robust. With the changes, the 600 GTO
is very good photographic platform. I've taken some excellent images with it
lately (http://www.wodaski.com) with my 5" refractor. I recently acquired an
EM-200 mount, and will be doing some side-by-side comparisons between the
two to see how they shape up.

The 600 GTO is extremely portable, which is its main attraction for me. I
bought a large Pelican case into which I can fit all mount components, and I
can transport and set up quickly.

Ron Wodaski

-----Original Message-----
From: John Gleason [mailto:dvj@earthlink.net]
Sent: Thursday, March 16, 2000 7:32 PM
To: ap-gto@egroups.com
Subject: [ap-gto] Re: Should I select 900GTO or 1200GTO?


Don't rule out the AP goto 600 mount. If you are not too serious about
astrophotography and have the AP155 with the 2.7" focuser, I would suggest
the 600 as a best all around mount for portability and support of the 6".
I have used the entire AP QMD mount product line and was very surprised to
see just how well the 600 supported even the 155 EDF for serious visual
observation. I mounted the AP 400 once to a standard Losmandy Pier and
even went as far to put the 155 EDF on it. Not recommended, but it did
support the telescope for visual work at my great surprise.

If on the otherhand you are obsessed with catching photons on film or
silicon, I wouldn't use anything less then the 900.

Happy choosing!

John Gleason, dvj@earthlink.net
http://www.celestialimage.com



----------
From: N. Foldager <nf@dadlnet.dk>
To: ap-gto@egroups.com
Subject: [ap-gto] Should I select 900GTO or 1200GTO?
Date: Thursday, March 16, 2000 8:32 AM

I would like someday to purchase an AP 155 Starfire, but for
economical reasons I have to start with the mount, and wait with the
scope. (In the meantime, I will use a good, homebuilt 4" doublet).

But should I select a 900GTO or a GTO-1200 mount?

One big problem is that I am several thousands kilometers away from
the showrooms; so I need your help.

If I had a permanent observation site, I would undoubtly select the
GTO-1200. However, as for now, I do not have a permanent site. I hope
to get one within some years. Until then, I will have to transport
the equipment in my (compact) car every time.

Paul Gustafson has a 900GTO and kindly gave me some clues to this
problem. I would like, however, to supplement with the opinions from
other users; in particular 1200GTO owners who have to transport their
mount by car to the observation site.

Would you think that the 1200GTO is too big and heavy for me in the
situation described above?

If I purchase a 900GTO, will I regret that I did not select the
1200GTO the day where I have a permanent site and maybe want to add
another scope or more equipment?

Also, I understand that the 1200GTO needs a pier where the 900GTO can
do with a tripod. Right? That means that I have to include the weight
and volume drawbacks of a pier versus a tripod when I consider
portability of these two mounts.

I very much appreciate any comments on this.

Best regards,

Niels Foldager
Copenhagen
Denmark

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