Date   

Re: First images with AP1200 GTO

Roland Christen
 

In a message dated 6/22/2007 11:23:05 AM Central Daylight Time,
ayiomami@otenet.gr writes:


The concern I have with my set is the nice big circles which
show up when taking flats.
That's caused by dust particles.

Rolando


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Re: First images with AP1200 GTO

Roland Christen
 

In a message dated 6/22/2007 5:40:49 AM Central Daylight Time,
ayiomami@otenet.gr writes:


It is my understanding that SBIG's filters are produced by Custom
Scientific (at least the LRGB ones).
My ST10XE is one of the first ones. It is quite old, and the filters are not
fully multi-coated on all surfaces. I don't care who made these filters. If
one surface is left without coatings, there will be 4% reflection from that
surface, which will indeed cause a 4% ghost image.

Rolando

Rolando


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Re: First images with AP1200 GTO

ayiomamitis
 

Rick,

I have SBIG's standard CLRGB filters and I do not experience such a
problem. I image a lot of clusters (ie. lots of starry fields) and I
have never encountered such a problem not even once.

Is it possible that slight ambient temperature changes are affecting
your focus point, thus giving you the false impression that the
filters are doing something? I amvery careful of the ambient
temperature and do refocus if necessary.

Anthony.

--- In ap-gto@yahoogroups.com, "Rick Wiggins" <rickwiggins@...> wrote:

Hi Guys,
It is well known (meaning I personally know more than ten imagers
that have had this problem and it is regularly discussed on several
imaging forums) that the blue and green filters cause halos in RGB
images. Many people believe that they are very bad in the AstronDon
filters. They definetly happen with the AstroDons. I don't have
enough data on non-AstroDon filters to do an objective comparison.
It is obviously more prevalent around bright stars and is worse the
more you stretch the image. I have not seen halos with narrow band
filters of any brand.
Thanks, Rick

--- In ap-gto@yahoogroups.com, chris1011@ wrote:

In a message dated 6/21/2007 12:38:25 PM Central Daylight Time,
kgkirkley@ writes:


you say the Baader filter(s?) do
not cause any halos.
I have been testing the Baader filters for the last week under all
kinds of
sky conditions. I do not see any halos around any bright stars. My
H-a images
are very sharp with no reflections or ghost images around any
stars. Maybe I am
mistaken about Astrodon filters (I have not tested them myself,
but go only
on what I have heard from others). I do know that several of my
RGB filters in
my ST10 camera cause multiple reflection ghosts near bright stars.
I don't
know who makes these filters for SBIG, but they are not of the
quality level of
the Baader series. In my STL11K camera I have installed 3 of the
narrow band 2"
Baader filters and the images they produce are super nice. All
Baader filters
have high grade multi-layer coatings on them to insure freedom
from
reflections.

It may also be that the original poster's reflections are coming
from his
cover glass and filter rear surface, something that can't be
avoided unless the
coverglass is coated with a multi-layer.

Rolando


**************************************
See what's free at
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[Non-text portions of this message have been removed]


Re: First images with AP1200 GTO

ayiomamitis
 

--- In ap-gto@yahoogroups.com, chris1011@... wrote:

on what I have heard from others). I do know that several of my RGB
filters in
my ST10 camera cause multiple reflection ghosts near bright stars. I
don't
know who makes these filters for SBIG, but they are not of the
quality level of
the Baader series. In my STL11K camera I have installed 3 of the
narrow band 2"

Rolando,

It is my understanding that SBIG's filters are produced by Custom
Scientific (at least the LRGB ones).

Anthony.


Re: First images with AP1200 GTO

elraeburn <eraeburn@...>
 

--- In ap-gto@yahoogroups.com, chris1011@... wrote:

I have been testing the Baader filters for the last week under all
kinds of sky conditions. I do not see any halos around any bright
stars...several of my RGB filters in my ST10 camera cause multiple
reflection ghosts near bright stars. I don't know who makes these
filters for SBIG, but they are not of the quality level of the Baader
series.
This raises an issue I've been wanting to ask about for some time: how
do the Baader RGB filters perform for CCD imaging? The transmission
curves look to me like they are not designed for this application
(unequal coverage across the visual spectrum). How do they handle the
"Astrodon Teal Criterion" (blue and green transmission curves
intersecting at the OIII line)? Also, is it true they are available
only in 1.25" models?

-Eric


Re: GPS on a German Equatorial Mount

michael mcdermott <classicstone9474@...>
 

I am curious to know how the AP mounts are able to get the time and location from the keypad/mount? There is a feature now isn't there?- Michael

John Stone <johns@ks.uiuc.edu> wrote: I'm late replying to this, but from my point of view, the GPS is
mainly useful as an accurate time reference. People doing minor
planet work like to have accurate times on their exposures. But in
that use case, the user has a computer involved already, and can thus
attach the GPS to the computer which is what they probably want to do
anyway..For normal visual observing I don't see any real benefit.

I would vote that this feature not be added unless you can add it as
an _optional_ startup mode/phase in the firmware for the existing
mount controllers (e.g. a firmware upgrade for CP3 mount controllers).
If implemented as new firmware that just "listens" on one of the
serial ports, that might be useful for some people.

One could make a small microcontroller box to interface a GPS to an AP
mount for a modest cost if people are really wound up and absolutely
have to have GPS with their AP mount. I'm sure a PIC or a BASIC STAMP
chip could do this pretty trivially. Parsing NMEA packets from a GPS
is easy. Such a box could be used even with the older mounts.

Cheers,
John Stone

--- In ap-gto@yahoogroups.com, chris1011@... wrote:

Hello All,

Marj informs me that our main competitor has now offered a GPS for
the Gemini
GoTo system. I realize that GPS is vital for Alt-Az mountings, since
tracking
rate of any object in the sky is variable and directly affected by your
location on earth. However, since the tracking rate of a polar
aligned GEM is
always fixed at sidereal, I question the need for this added
complication to the
system (another thing to go wrong out in the field). Myself, I think
of it like
having anti-lock brakes on a speedboat, however Marj is totally
convinced that
we will need this vital bit of technology in order to not be left
behind by
the competition.

So what exactly does GPS offer to a GEM (it won't help you to polar
align)?
Any thoughts from the advanced users out there?

Rolando


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Re: GPS on a German Equatorial Mount

John Stone <johns@...>
 

I'm late replying to this, but from my point of view, the GPS is
mainly useful as an accurate time reference. People doing minor
planet work like to have accurate times on their exposures. But in
that use case, the user has a computer involved already, and can thus
attach the GPS to the computer which is what they probably want to do
anyway..For normal visual observing I don't see any real benefit.

I would vote that this feature not be added unless you can add it as
an _optional_ startup mode/phase in the firmware for the existing
mount controllers (e.g. a firmware upgrade for CP3 mount controllers).
If implemented as new firmware that just "listens" on one of the
serial ports, that might be useful for some people.

One could make a small microcontroller box to interface a GPS to an AP
mount for a modest cost if people are really wound up and absolutely
have to have GPS with their AP mount. I'm sure a PIC or a BASIC STAMP
chip could do this pretty trivially. Parsing NMEA packets from a GPS
is easy. Such a box could be used even with the older mounts.

Cheers,
John Stone

--- In ap-gto@yahoogroups.com, chris1011@... wrote:

Hello All,

Marj informs me that our main competitor has now offered a GPS for
the Gemini
GoTo system. I realize that GPS is vital for Alt-Az mountings, since
tracking
rate of any object in the sky is variable and directly affected by your
location on earth. However, since the tracking rate of a polar
aligned GEM is
always fixed at sidereal, I question the need for this added
complication to the
system (another thing to go wrong out in the field). Myself, I think
of it like
having anti-lock brakes on a speedboat, however Marj is totally
convinced that
we will need this vital bit of technology in order to not be left
behind by
the competition.

So what exactly does GPS offer to a GEM (it won't help you to polar
align)?
Any thoughts from the advanced users out there?

Rolando


**************************************
See what's free at
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[Non-text portions of this message have been removed]


Re: First images with AP1200 GTO

peturnielsen
 

and price ?

astrodon (6nm) is $695 vs baader (7nm) is $335 !!(for STL 11000)

p


--- In ap-gto@yahoogroups.com, kgkirkley@... wrote:


In a message dated 6/21/07 1:42:04 PM, chris1011@... writes:



I have been testing the Baader filters for the last week under all
kinds of
sky conditions. I do not see any halos around any bright stars. My
H-a
images
are very sharp with no reflections or ghost images around any
stars. Maybe I
am
mistaken about Astrodon filters (I have not tested them myself,
but go only
on what I have heard from others). I do know that several of my
RGB filters
in
my ST10 camera cause multiple reflection ghosts near bright stars.
I don't
know who makes these filters for SBIG, but they are not of the
quality level
of
the Baader series. In my STL11K camera I have installed 3 of the
narrow band
2"
Baader filters and the images they produce are super nice. All Baader
filters
have high grade multi-layer coatings on them to insure freedom from
reflections.

It may also be that the original poster's reflections are coming
from his
cover glass and filter rear surface, something that can't be
avoided unless
the
coverglass is coated with a multi-layer.

Rolando
Roland:

Thanks for the clarification.

Kent


**************************************
See what's free at
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[Non-text portions of this message have been removed]


Re: [PHISHING]: Re: Re: First images with AP1200 GTO

bcoote37
 

Hi Rolando,
I have been looking back at recent images with my STL11K and Astrodon filters.
How much halo is visible on stars certainly depends on how much stretching of data is used to make them more visible.
Very bright stars certainly induce strong reflections and green is by far the worst on my system.

I think interline chips are probably indirectly involved as with the full frame chips the bright stars usually induced blooms which required processing to remove. As a result I anyway avoided overlong integrations with my ST8E NABG .
Regards, Brian

http://www.bcoote-astro.com/default.htm

----- Original Message -----
From: chris1011@aol.com
To: ap-gto@yahoogroups.com
Sent: Friday, June 22, 2007 5:47 AM
Subject: [PHISHING]: Re: [ap-gto] Re: First images with AP1200 GTO




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In a message dated 6/21/2007 2:32:22 PM Central Daylight Time,
stuart.j.heggie@sympatico.ca writes:

> Roland, the SBIG filters are from Custom Scientific I believe. I get very
> strong halos from my green Astrodon. I had thought it was due to the fast
> f-ratio I was shooting with the scope I've had till now.
>

I have an older SBIG ST10E which has very strong multiple reflections form
the green filter and fainter ones from the blue. These filters have no coatings
on one side, so about 4% of the energy keeps bouncing between front and rear
surface. I do not know where SBIG got those filters. The STL11K camera that I
got from Ray Gralack have Custom Scientific RGB filters, he tells me. I have
not had any reflection problems with them.

Rolando

**************************************
See what's free at
http://www.aol.com.






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Re: First images with AP1200 GTO

Tom Davis
 

I know this would be difficult to do, but it would be very
illustrative to see a same target, same scope, same camera but
different filters (especially RGB) side by side image comparison. I
currently have A-dons and unfortunately sold my SBIG/CS filters.

Tom


--- In ap-gto@yahoogroups.com, chris1011@... wrote:

In a message dated 6/21/2007 2:32:22 PM Central Daylight Time,
stuart.j.heggie@... writes:


Roland, the SBIG filters are from Custom Scientific I believe. I
get very
strong halos from my green Astrodon. I had thought it was due to
the fast
f-ratio I was shooting with the scope I've had till now.
I have an older SBIG ST10E which has very strong multiple
reflections form
the green filter and fainter ones from the blue. These filters have
no coatings
on one side, so about 4% of the energy keeps bouncing between front
and rear
surface. I do not know where SBIG got those filters. The STL11K
camera that I
got from Ray Gralack have Custom Scientific RGB filters, he tells
me. I have
not had any reflection problems with them.

Rolando


**************************************
See what's free at
http://www.aol.com.




Re: First images with AP1200 GTO

Wiggins, Rick
 

Hi Guys,
It is well known (meaning I personally know more than ten imagers
that have had this problem and it is regularly discussed on several
imaging forums) that the blue and green filters cause halos in RGB
images. Many people believe that they are very bad in the AstronDon
filters. They definetly happen with the AstroDons. I don't have
enough data on non-AstroDon filters to do an objective comparison.
It is obviously more prevalent around bright stars and is worse the
more you stretch the image. I have not seen halos with narrow band
filters of any brand.
Thanks, Rick

--- In ap-gto@yahoogroups.com, chris1011@... wrote:

In a message dated 6/21/2007 12:38:25 PM Central Daylight Time,
kgkirkley@... writes:


you say the Baader filter(s?) do
not cause any halos.
I have been testing the Baader filters for the last week under all
kinds of
sky conditions. I do not see any halos around any bright stars. My
H-a images
are very sharp with no reflections or ghost images around any
stars. Maybe I am
mistaken about Astrodon filters (I have not tested them myself,
but go only
on what I have heard from others). I do know that several of my
RGB filters in
my ST10 camera cause multiple reflection ghosts near bright stars.
I don't
know who makes these filters for SBIG, but they are not of the
quality level of
the Baader series. In my STL11K camera I have installed 3 of the
narrow band 2"
Baader filters and the images they produce are super nice. All
Baader filters
have high grade multi-layer coatings on them to insure freedom
from
reflections.

It may also be that the original poster's reflections are coming
from his
cover glass and filter rear surface, something that can't be
avoided unless the
coverglass is coated with a multi-layer.

Rolando


**************************************
See what's free at
http://www.aol.com.




Re: First images with AP1200 GTO

Stuart Heggie <stuart.j.heggie@...>
 

Roland, the SBIG filters are from Custom Scientific I believe. I get very strong halos from my green Astrodon. I had thought it was due to the fast f-ratio I was shooting with the scope I've had till now.

Stuart
============================================================
From: chris1011@aol.com
Date: 2007/06/21 Thu PM 02:37:23 EDT
To: ap-gto@yahoogroups.com
Subject: Re: [ap-gto] Re: First images with AP1200 GTO

In a message dated 6/21/2007 12:38:25 PM Central Daylight Time,
kgkirkley@aol.com writes:


you say the Baader filter(s?) do
not cause any halos.
I have been testing the Baader filters for the last week under all kinds of
sky conditions. I do not see any halos around any bright stars. My H-a images
are very sharp with no reflections or ghost images around any stars. Maybe I am
mistaken about Astrodon filters (I have not tested them myself, but go only
on what I have heard from others). I do know that several of my RGB filters in
my ST10 camera cause multiple reflection ghosts near bright stars. I don't
know who makes these filters for SBIG, but they are not of the quality level of
the Baader series. In my STL11K camera I have installed 3 of the narrow band 2"
Baader filters and the images they produce are super nice. All Baader filters
have high grade multi-layer coatings on them to insure freedom from
reflections.

It may also be that the original poster's reflections are coming from his
cover glass and filter rear surface, something that can't be avoided unless the
coverglass is coated with a multi-layer.

Rolando


**************************************
See what's free at
http://www.aol.com.





============================================================


Re: First images with AP1200 GTO

Kent Kirkley
 

In a message dated 6/21/07 1:42:04 PM, chris1011@aol.com writes:



I have been testing the Baader filters for the last week under all kinds of
sky conditions. I do not see any halos around any bright stars. My H-a
images
are very sharp with no reflections or ghost images around any stars. Maybe I
am
mistaken about Astrodon filters (I have not tested them myself, but go only
on what I have heard from others). I do know that several of my RGB filters
in
my ST10 camera cause multiple reflection ghosts near bright stars. I don't
know who makes these filters for SBIG, but they are not of the quality level
of
the Baader series. In my STL11K camera I have installed 3 of the narrow band
2"
Baader filters and the images they produce are super nice. All Baader
filters
have high grade multi-layer coatings on them to insure freedom from
reflections.

It may also be that the original poster's reflections are coming from his
cover glass and filter rear surface, something that can't be avoided unless
the
coverglass is coated with a multi-layer.

Rolando
Roland:

Thanks for the clarification.

Kent


**************************************
See what's free at
http://www.aol.com.


Re: First images with AP1200 GTO

Roland Christen
 

In a message dated 6/21/2007 2:32:22 PM Central Daylight Time,
stuart.j.heggie@sympatico.ca writes:


Roland, the SBIG filters are from Custom Scientific I believe. I get very
strong halos from my green Astrodon. I had thought it was due to the fast
f-ratio I was shooting with the scope I've had till now.
I have an older SBIG ST10E which has very strong multiple reflections form
the green filter and fainter ones from the blue. These filters have no coatings
on one side, so about 4% of the energy keeps bouncing between front and rear
surface. I do not know where SBIG got those filters. The STL11K camera that I
got from Ray Gralack have Custom Scientific RGB filters, he tells me. I have
not had any reflection problems with them.

Rolando


**************************************
See what's free at
http://www.aol.com.


Re: First images with AP1200 GTO

Roland Christen
 

In a message dated 6/21/2007 12:38:25 PM Central Daylight Time,
kgkirkley@aol.com writes:


you say the Baader filter(s?) do
not cause any halos.
I have been testing the Baader filters for the last week under all kinds of
sky conditions. I do not see any halos around any bright stars. My H-a images
are very sharp with no reflections or ghost images around any stars. Maybe I am
mistaken about Astrodon filters (I have not tested them myself, but go only
on what I have heard from others). I do know that several of my RGB filters in
my ST10 camera cause multiple reflection ghosts near bright stars. I don't
know who makes these filters for SBIG, but they are not of the quality level of
the Baader series. In my STL11K camera I have installed 3 of the narrow band 2"
Baader filters and the images they produce are super nice. All Baader filters
have high grade multi-layer coatings on them to insure freedom from
reflections.

It may also be that the original poster's reflections are coming from his
cover glass and filter rear surface, something that can't be avoided unless the
coverglass is coated with a multi-layer.

Rolando


**************************************
See what's free at
http://www.aol.com.


Re: First images with AP1200 GTO

Kent Kirkley
 

In a message dated 6/21/07 12:13:55 PM, chris1011@aol.com writes:



I use the Baader 2" filter now. It does not cause any halos.

Rolando
Roland:
I responded to your post, with wonderment, some days ago where you mentioned
that Astrodon filters caused halos. And, now you say the Baader filter(s?) do
not cause any halos.

This is the first I have heard of this 'situation', while halos have been
evident since the beginning of their use in ccd imaging, I thought all filters
produced some level of halos, especially with faster optical systems. I also
thought all filter manufacturers anti-reflection coated their filters.

So what is unique about the Baader's?
Is Baader producing only the Ha or a complete line of LRGB, Ha, etc. filters?

Kent Kirkley






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Re: First images with AP1200 GTO

Roland Christen
 

In a message dated 6/20/2007 8:00:49 PM Central Daylight Time,
peturnielsen@yahoo.com writes:


do all H-alpha filters cause halo (i'm looking to buy one and was
thinking about getting the astrodon). what h-alpha filter would you
recommend ?
I use the Baader 2" filter now. It does not cause any halos.

Rolando


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B343 Dark nebula in Cygnus - LLRGB 4 hrs total exposure

ayiomamitis
 

Dear Group,

With Cygnus slowly getting into good position for imaging, there is a wide variety of goodies it provides for the interested observer and imager.

Given the plethora of Barnard dark nebulae it offers, I thought I would try my hand with one of the largest such objects just north of the bright star Sadr.

More specifically, I pursued B343 which lies within a couple of degrees just north of Sadr. For an image based on four hours total exposure, I kindly direct you to http://www.perseus.gr/Astro-DSO-Nebulae-Dark-B343.htm . This is my first attempt at a dark nebula and I would welcome all feedback. I have checked around and cannot find any reference images for comparison B343 ... if someone has pursued this particular object, I would love to see your results.

Clear skies!

Anthony.


Re: New features

Norm
 

Rick,

If you want a right-angle adapter try L-com #DG090MF1 or #DG090MF2.
See them at www.L-com.com.

Norm

--- In ap-gto@yahoogroups.com, "Rick K" <JunkMailGoesHere@...> wrote:

--- In ap-gto@yahoogroups.com, "David B. Toth" <ve3gyq@> wrote:

At 09:36 AM 6/19/2007, Rick K wrote:
And which batteryless Bluetooth adapter will do this job? AFAIK
the
serial port on the AP mounts have NO provision for supplying
power to
attached serial devices. As well any of those serial devices
are about
2 inches long and would stick up waiting to get ripped off the
controller as the scope or camera passed by. No thanks.
Integrated is
by far the best solution.
The Socket CSA is 2" or less in size, and can get its power from
Pin
9 ... you can wire pin 9 on your mount with 5 volts.
The adaptor doesn't seem to stick out any further than a DB9
would
.... I don't think it would be too vulnerable to "attack" if I
recall
where the connector is.

BTW, I think reworking the mount's electronics to add Bluetooth
would
very well require RECERTIFICATION by the FCC ...
If I recall correctly, that can cost upwards of $20k - Roland
could
comment as I am sure he knows the cost.

(The electronics have to be evaluated for the FCC to prove that
they
do not have significant RF radiation - I'm not sure if a simple
rework
would require this, but it would not surprise me)

Your mileage may vary.

Dave
Sorry, but I have looked into this and 2 inches is over a half
inch
too high. The clearance on the mount from both the big 900 and 1200
plates is inadequate to allow a 2" projection. It barely clears a
1.25" projection. I actually tie the serial cables down out of the
way
specifically so that they stay out of the way. I have been on the
lookout for right angle DB9 connectors but since RS232 is
essentially
obsolete, such items are virtually impossible to find. As it
stands,
for Bluetooth, I could wire up a short 'serial' extender cable and
modify the port to supply power but this is just a kludge. A proper
built-in Bluetooth implementation would be better. Of course, all
this
pales when compared to adding USB connectivity. THAT is way more
important. Shelve Bluetooth entirely if it is going to be a choice
between that and USB.

Although I would be completely at ease modifying the controller to
supply power to the Bluetooth adapter, I am wondering what Roland
would think about this. I expect that he might not be amused and
that
it would void the warranty.


Re: First images with AP1200 GTO

peturnielsen
 

do all H-alpha filters cause halo (i'm looking to buy one and was
thinking about getting the astrodon). what h-alpha filter would you
recommend ?

Peter


$--- In ap-gto@yahoogroups.com, chris1011@... wrote:

In a message dated 6/16/2007 8:54:07 AM Central Daylight Time,
dbcoote@... writes:


These show some halos around the stars in colour but at least I am
not
clipping the data (much) any more.
This is at:-
http://www.bcoote-astro.com/eta_tri_panel.htm
That is a pretty amazing image. By the way, it is well known that
Astrodon
filters do cause halos around bright stars. It's because of the type
of coatings
they use.

Rolando


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[Non-text portions of this message have been removed]