Date   

Re: Optimizing the 1200gto for astrophotography !!!??

Ray Gralak <rgr@...>
 

Norm,

Eric may be referring to something I have been working on in PEMPro. Normally
you would use PEMPro to look at a mount's periodic error but if you switch the
graph to the other axis, which is declination, you can see the amount of Dec
drift. PEMPro can be this used as a highly accurate drift detector for polar
alignment.

The new feature reverse calculates the amount of error based on the drift (while
taking refraction into account). Then when you adjust the mount (and thus lose
the tracking star) PEMPro will automatically find another star and start
recalculating the drift. This makes it extremely easy to do a very precise polar
alignment.

And unlike PoleAlignMax you do not need to do any plate solves (which may not
even be possible if you are very far out of alignment).

-Ray

-----Original Message-----
From: ap-gto@... [mailto:ap-gto@...]
On Behalf Of Norman Worsley
Sent: Tuesday, January 23, 2007 6:26 AM
To: ap-gto@...
Subject: [ap-gto] Re:Optimizing the 1200gto for astrophotography !!!??

Eric,

PEMPro is not for pointing...it is only to correct for
periodic error. If you want to improve your pointing accuracy
you must use something like T-Point or MaxPoint. I have no
experience with MaxPoint, but T-Point can get your pointing
accuracy down to arc seconds if you are patient.

Norm

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Re: Optimizing the 1200gto for astrophotography !!!??

ayiomamitis
 

Norm,

You can indeed use PEMPro for pointing .... just by looking at the
trend in the centroids between successive exposures. If the centroids
remain effectively static, you are basically well aligned. However, if
there is a constant drift in the centroids (up or down), then you
can/must adjust your mount accordingly.

In fact, by merely looking at the x- and y-drift averages displayed on
the main PEMPro screen, you can adjust from there (something which I
have done quite effectively).

Anthony.

--- In ap-gto@..., Norman Worsley <wskystalker@...> wrote:

Eric,

PEMPro is not for pointing...it is only to correct for periodic
error. If you want to improve your pointing accuracy you must use
something like T-Point or MaxPoint. I have no experience with
MaxPoint, but T-Point can get your pointing accuracy down to arc
seconds if you are patient.

Norm


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Re: Optimizing the 1200gto for astrophotography !!!??

Norm
 

Eric,

PEMPro is not for pointing...it is only to correct for periodic error. If you want to improve your pointing accuracy you must use something like T-Point or MaxPoint. I have no experience with MaxPoint, but T-Point can get your pointing accuracy down to arc seconds if you are patient.

Norm


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Re: Optimizing the 1200gto for astrophotography !!!??

ayiomamitis
 

--- In ap-gto@..., "Richard Kinsey" <richard.kinsey@...>
wrote:

Eric, in order to use PoleAlignMax you will need both the software
and the GSC11 star database.

The PoleAlignMax software can be downloaded at,

http://users.bsdwebsolutions.com/~larryweber/PoleAlignMaxDownload.htm

The GSC11 star database can be downloaded at

http://gsc.dc3.com/
Hehehe ... thanks for answering my question prior to receiving it. :-)

Anthony.


Please note that the GSC database must be installed EXACTLY in
accordance with the instructions.

Regards, Richard


--- In ap-gto@..., "astrophoto10d" <ngc7000@> wrote:

Hi Everyone, I want to work on my mount to achieve a very precise
polar alignment for astrophotography and searching for ways to do
it......I've already done a very good drift alignment but when using
narrowband filter I must be very precise..........what about
Pempro ??
Is it worth the prices ? What do you suggest ?? Maybe a software
for a
precise alignment using a ccd would be great ?? Thanks, Eric


Re: Optimizing the 1200gto for astrophotography !!!??

ayiomamitis
 

Richard,

This is something which I also wanted to pursue but was put off by the
need to load the 11-CD set of the USNO catalog. Is there a quicker way
to solve the issue of plate-solving?

Thanks.

Anthony.

--- In ap-gto@..., "Richard Kinsey" <richard.kinsey@...>
wrote:

Hi Eric, I use the free software, PoleAlignMax, to align my AP900 and
can quickly achieve alignment withing 1 arc minute in both azimuth and
elevation. I would recommend it to anyone with a ccd camera and either
Maxim DL or CCD Soft. Regards, Richard

--- In ap-gto@..., "astrophoto10d" <ngc7000@> wrote:

Hi Everyone, I want to work on my mount to achieve a very precise
polar alignment for astrophotography and searching for ways to do
it......I've already done a very good drift alignment but when using
narrowband filter I must be very precise..........what about Pempro ??
Is it worth the prices ? What do you suggest ?? Maybe a software for a
precise alignment using a ccd would be great ?? Thanks, Eric


Re: Optimizing the 1200gto for astrophotography !!!??

Roland Christen
 

In a message dated 1/22/2007 10:31:26 PM Central Standard Time,
wrmattil@... writes:


Can you explain to me how narrowband filters demand better polar
alignment than ... RGB ? Or are you somehow suggesting that you want to
do *unguided* imaging which is a completely different problem altogether
? Or am I just being dense ?
It is difficult to find guide stars when using narrow band imaging because
not much light is coming through the filter. Therefore you will need to expose
for long periods to get a suitable guide star, which means that your mount
cannot drift appreciably during that time. When I do H-a imaging with a 10nm
filter, it sometimes takes 30 second exposure to get a useable guide star. If I am
properly polar aligned and have the periodic error compensation dialed in then
the guide star will not usually drift at all for that time period. Sub-arc
second guiding is then possible.

Rolando


Re: File corruption

Jeff Young <jey@...>
 

Joe --

I'm not Dennis, but I paid $8500 for an AP1200GTO CP2 w/ 4
counterweights and a 12" Casady saddle about a year ago. I believe I
also paid the seller a couple hundred extra for international shipping
(I'm in Ireland).

-- Jeff.


________________________________

From: ap-gto@... [mailto:ap-gto@...] On
Behalf Of Joe Kuhn
Sent: Monday, January 22, 2007 10:31 PM
To: ap-gto@...
Subject: RE: [ap-gto] Re: File corruption



Hi,

Sorry if I am being nosy, but about what did you pay for the
used ap1200?

Joe in Mobile

_____

From: ap-gto@... <mailto:ap-gto%40yahoogroups.com>
[mailto:ap-gto@... <mailto:ap-gto%40yahoogroups.com> ] On
Behalf Of
chris1011@... <mailto:chris1011%40aol.com>
Sent: Monday, January 22, 2007 10:04 AM
To: ap-gto@... <mailto:ap-gto%40yahoogroups.com>
Subject: [ap-gto] Re: File corruption

Hello all

posting this for the second time as the first didn't seem to go
anywhere. I recently bought a used 1200 with 4.12 software. The
catalogue was corrupted so I fitted a new battery. All is now
ok. The
old battery was 0.46 volts, the mount saw first light around Aug
2002.

Dennis Isaacs


Re: Optimizing the 1200gto for astrophotography !!!??

Richard Kinsey
 

Eric, in order to use PoleAlignMax you will need both the software
and the GSC11 star database.

The PoleAlignMax software can be downloaded at,

http://users.bsdwebsolutions.com/~larryweber/PoleAlignMaxDownload.htm

The GSC11 star database can be downloaded at

http://gsc.dc3.com/

Please note that the GSC database must be installed EXACTLY in
accordance with the instructions.

Regards, Richard


--- In ap-gto@..., "astrophoto10d" <ngc7000@...> wrote:

Hi Everyone, I want to work on my mount to achieve a very precise
polar alignment for astrophotography and searching for ways to do
it......I've already done a very good drift alignment but when using
narrowband filter I must be very precise..........what about
Pempro ??
Is it worth the prices ? What do you suggest ?? Maybe a software
for a
precise alignment using a ccd would be great ?? Thanks, Eric


Re: Optimizing the 1200gto for astrophotography !!!??

Richard Kinsey
 

Hi Eric, I use the free software, PoleAlignMax, to align my AP900 and
can quickly achieve alignment withing 1 arc minute in both azimuth and
elevation. I would recommend it to anyone with a ccd camera and either
Maxim DL or CCD Soft. Regards, Richard

--- In ap-gto@..., "astrophoto10d" <ngc7000@...> wrote:

Hi Everyone, I want to work on my mount to achieve a very precise
polar alignment for astrophotography and searching for ways to do
it......I've already done a very good drift alignment but when using
narrowband filter I must be very precise..........what about Pempro ??
Is it worth the prices ? What do you suggest ?? Maybe a software for a
precise alignment using a ccd would be great ?? Thanks, Eric


Re: Optimizing the 1200gto for astrophotography !!!??

William R. Mattil <wrmattil@...>
 

astrophoto10d wrote:
Hi Everyone, I want to work on my mount to achieve a very precise
polar alignment for astrophotography and searching for ways to do
it......I've already done a very good drift alignment but when using
narrowband filter I must be very precise..........what about Pempro ??
Eric,

Can you explain to me how narrowband filters demand better polar alignment than ... RGB ? Or are you somehow suggesting that you want to do *unguided* imaging which is a completely different problem altogether ? Or am I just being dense ?

Bill


--

William R. Mattil : http://www.celestial-images.com


Optimizing the 1200gto for astrophotography !!!??

astrophoto10d
 

Hi Everyone, I want to work on my mount to achieve a very precise
polar alignment for astrophotography and searching for ways to do
it......I've already done a very good drift alignment but when using
narrowband filter I must be very precise..........what about Pempro ??
Is it worth the prices ? What do you suggest ?? Maybe a software for a
precise alignment using a ccd would be great ?? Thanks, Eric


Re: I broke my 1200GTO...

Jeff Young <jey@...>
 

Roland & Wally --

Cable arrived today; clouds even parted. Motor is still a bit noisier
(high-pitched; 15khz or there-abouts) than it was, but everything
functions well.

-- Jeff.



________________________________

From: ap-gto@... [mailto:ap-gto@...] On
Behalf Of Jeff Young
Sent: Monday, January 15, 2007 5:03 PM
To: ap-gto@...
Subject: RE: [ap-gto] I broke my 1200GTO...



Roland --

Thanks for your reply. I think I was probably on the phone with
Wally
as you penned it. ;)

I've got a new Y-cable on the way (and Wally seems to think that
all my
other symptoms could have been caused by the shredded cable), so
I'll
make sure the motor spins freely in the meantime and then see
how things
go with the new cable.

Thanks again,
-- Jeff.

________________________________

From: ap-gto@... <mailto:ap-gto%40yahoogroups.com>
[mailto:ap-gto@... <mailto:ap-gto%40yahoogroups.com> ] On
Behalf Of chris1011@... <mailto:chris1011%40aol.com>
Sent: Monday, January 15, 2007 4:30 PM
To: ap-gto@... <mailto:ap-gto%40yahoogroups.com>
Subject: Re: [ap-gto] I broke my 1200GTO...



In a message dated 1/13/2007 3:37:14 PM Central Standard Time,
jey@... <mailto:jey%40adobe.com> <mailto:jey%40adobe.com>

writes:

> does the RA motor usually suffer in the process as
> well? Or do you think re-setting the backlash might correct
the
> issues I'm seeing there?

It is possible for the motor to become damaged, but that would
not cause a
runaway condition. intermittend runaway is usually caused by
voltage dropping
below 11 volts. There would be no change in backlash - that
would have nothing
to do with a motor being good or bad.

>
> Lastly, if I do need a new RA motor, are the worms matched to
the
> worm wheels? Would I need to send in my RA motor housing for
repair
> (to keep the same worm), or could I simply order a whole new
> motor/worm assembly?
>

No need to order a new RA motor gearbox and housing. If you need
a new motor,
this can be ordered and you can install it yourself. It would
not be
difficult to do with a few proper precautions. As far as
checking whether the motor is
ok or not, simply remove the mating gear (the white one) in the
gearbox so
that the motor is unloaded. Then gently try to turn the motor
shaft. If you can
feel nothing, and the motor shaft turns freely, then there is
noting wrong. If
it feels lumpy or tight in spots as you turn the shaft, then you
have melted
the rotor windings and it is now rubbing on the stator. The
motor is then
damaged.

Roland Christen


AP900 GTO - Clicking noise from RA motor/gearbox

Richard Kinsey
 

A month or so ago I had a problem with the RA gearbox on my AP900 in
that it started to make a terrible screeching noise when slewing. After
consiltation with Wally at AP, I removed the cover from the gearbox and
immediately identified the problem. The flat screw headed bolt that
retains the large steel gear had come loose and unscrewed itself to the
point that it was rubbing on the gearbox casing. Tightening the bolt
obviously cured the screeching problem, but I have since noticed a
clicking noise from the RA gearbox when a change of slew direction
takes place. During the time that the mount was used with the gear
retaining bolt loose there was considerable play in the movement of the
steel gear. I am wondering whether this might have caused excessive
wear in the other gears resulting in play in the gearbox. I have also
noticed that when autoguiding there appears to be some backlash in the
RA drive. This is particularly apparent if the mount is not balanced so
as to be heavier on the eastern side of the mount. From feeling the
counterweight shaft there does not appear to be any play/backlash
between the RA gear and worm.
Any advice would be gratefully received.

Thanks in advance, Richard


Re: File corruption

Joe Kuhn <magsterone@...>
 

Hi,

Sorry if I am being nosy, but about what did you pay for the used ap1200?

Joe in Mobile



_____

From: ap-gto@... [mailto:ap-gto@...] On Behalf Of
chris1011@...
Sent: Monday, January 22, 2007 10:04 AM
To: ap-gto@...
Subject: [ap-gto] Re: File corruption



Hello all

posting this for the second time as the first didn't seem to go
anywhere. I recently bought a used 1200 with 4.12 software. The
catalogue was corrupted so I fitted a new battery. All is now ok. The
old battery was 0.46 volts, the mount saw first light around Aug 2002.

Dennis Isaacs


Re: File corruption "M" objects?

roundycat
 

Hello all

I'm a new member here and trying to enjoy the use of a used AP 1200
despite the clouds and wind. Mine had a corrupted database, not known
to the previous user as she never used it. I fitted a new battery and
re-loaded the data, no problems at all. The mount dates from Aug 2002
and just for interest the new battery voltage was 3.28V. The old one
was 0.46V. I'm pretty sure that was the problem!

I spent a couple of hours near the meridian last night and measured 1.5
arc sec Dec drift after two hours, I guess that's my polar alignment
done.

Dennis Isaacs


Re: File corruption

Roland Christen
 

Hello all

posting this for the second time as the first didn't seem to go
anywhere. I recently bought a used 1200 with 4.12 software. The
catalogue was corrupted so I fitted a new battery. All is now ok. The
old battery was 0.46 volts, the mount saw first light around Aug 2002.

Dennis Isaacs


Re: 900GTO Maximum Capacity for CCD Photography

Peter Santangeli
 

Geometry seems to count as much as weight for mount capacity - my
guess is that a folded scope like the RCOS would be fine, I believe
because the tube length is not that big in comparision to some other
designs.

I've been using a 16" f4.5 on my AP900:

http://santangeli.net/calstar2006/

It's ultralight for the aperture (62lbs including camera), and
probably the absolute max the mount can do, more because of the big
moment arm the OTA creates than the weight.

I'd be curious what AP's thinking was in stating the capacity of
70lbs... 70lbs refractor? Folded scope?

Pete

--- In ap-gto@..., "meadefun" <astronomy@...> wrote:

Hi,

Do you know, what is the maximum capacity of 900GTO for
astrophotography? Can I even dream of having 12.5" RCOS on 900GTO?

-Pete


Re: 900GTO Maximum Capacity for CCD Photography

Jon L Williams <bengoshi@...>
 

The same also applies to the 900 QMD?

Jon L. Williams

At 11:03 AM 1/19/07 -0500, you wrote:

In a message dated 1/19/2007 7:18:11 AM Central Standard Time,
<mailto:astronomy%40a1netti.com>astronomy@... writes:

Do you know, what is the maximum capacity of 900GTO for
astrophotography? Can I even dream of having 12.5" RCOS on 900GTO?
Certainly!

Roland Christen




Re: 900GTO Maximum Capacity for CCD Photography

Dwight Bogan
 

Should not be a problem. If you go to the RCOS web site and look
under mountings they state the 900 goto will handle the 10 and 12.5
inch RC. The wieght stated for the tube version of the 12.5 inch RCOS
is 48 lbs. figure an extra 20 lbs for camera, adapters, guidescope
and your still within the max loads of the 900 goto.

I've had my 900 goto since October of 1998 and never have run into a
load condition that would be a problem for this mount. My 900 handles
my AP 10 inch Mak Cass with no difficulty. There are people who use a
Celestron 14 with their 900 goto's and claim no difficulties at all.

Clear Skies
Dwight L Bogan

--- In ap-gto@..., "meadefun" <astronomy@...> wrote:

Hi,

Do you know, what is the maximum capacity of 900GTO for
astrophotography? Can I even dream of having 12.5" RCOS on 900GTO?

-Pete


Re: 900GTO Maximum Capacity for CCD Photography

Roland Christen
 

In a message dated 1/19/2007 11:52:05 AM Central Standard Time,
bengoshi@... writes:


The same also applies to the 900 QMD?

Jon L. Williams
If you will be doing advanced astrophotography using precision CCD cameras,
then I would recomend the latest servo drive mountings for best results.
Capacity wise, all 900 mounts are the same, but control wise, the servo drives are
the way to go.

Rolando