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  • Members: 2632
  • Category: Astronomy
  • Founded: Jan 25, 2000
  • Language: English
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FSQ & MonsterMOAG OAG   Message List  
Reply Message #44706 of 59128 |
I use a FSQ-106N and a SBIG STL-11K/FW-8 combo. Before I added
the FW-8, my images had nice round stars out to the corners of the
image. When I added the FW-8, I started getting elongation in my stars
on one side of the chip. This said to me that I probably now had a tilt
in the camera. However, when I rotated the camera (I also have a
Astrodon Takometer), the elongation got worse in certain PAs and better
in others. After much testing, I came to the conclusion that the
additional weight of the FW-8, plus the fact that the weight is offset
to the main optical path, was causing flex/sag in my optical train. I
started investigating where the flex/sag/elongation could be happening
and determined that there are 3 basic places this is most likely to
happen, 1. the focuser, 2. the CAA, 3. the guidescope. I addressed each
one and found "play, slop, looseness", in the focuser and CAA, and
eliminated the guidescope by installing an Astrodon MonsterMOAG. I now
have the imaging chip back square to the optical plane in all PAs and
the flex/sag is gone. I now guide with the MonsterMOAG (MMOAG) and
don't have to worry about flexure or focusing of the guidescope. The
addition of the MMOAG makes a very tight. compact, rigid imaging train
from the CAA to the main chip.

I put together a Word document that describes the adjustments I
made, and how I installed the MonsterMOAG on my FSQ. It is available
for download on my website here:

http://www.skyimager.com/FSQ-MMOAG/. The document is called
"Using an Astrodon MonsterMOAG with a Tak FSQ-106N".

Also, here is a link to the first image I took after these
modifications. It is a Ha image with the individual exposures (16 of
them, 30 min each), guided with the MMOAG.

http://www.skyimager.com/imagedata/IC405-IC410_12-18-07.html

If you are seeing any issues in your images similar to what I
did, this might be of some help. The MMOAG is an excellent alternative
to a separate guidescope.





Sun Dec 23, 2007 7:33 pm

startestor
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Message #44706 of 59128 |
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I use a FSQ-106N and a SBIG STL-11K/FW-8 combo. Before I added the FW-8, my images had nice round stars out to the corners of the image. When I added the FW-8,...
Frank S Barnes III
startestor Offline Send Email
Dec 23, 2007
7:33 pm

Frank, nice write up. In some of the photos on your website, I notice that you positioned your FSQ on the rings so that the Robofocus is on top. Does that...
sc02492 Offline Send Email Dec 23, 2007
8:06 pm

That's a very helpful writeup. I had, as many of you know, a terrible time with the FSQ-ED(X) (New Q) and that same camera/FW combination. The STL 8-place...
ancient.sull Offline Send Email Dec 24, 2007
2:48 am

Hi Steve, I have a set of custom made rings from Andy Homeyer to hold my FSQ. They attach to a set of Losmandy Dovetail plate adapter (DA). They are pretty low...
Frank S Barnes III
startestor Offline Send Email
Dec 24, 2007
5:06 pm

Thanks, Frank. I have already been down this road with my FSQ- tightened the CAA as well as the focuser tube (those 4 screws on top). The CAA is great, but I...
sc02492 Offline Send Email Dec 24, 2007
5:26 pm

Frank: nice document describing the use of the MMOAG with the FSQ. Quick question; I also use the FSQ with the CAA attached (EDX version). I do use the...
r1300rs Offline Send Email Jan 3, 2008
4:54 pm

Nice document. I'm also a new "Q" EDX user with the CAA attached. I also use Robo and noticed that your stepsize must be different than mine. Would you mind...
r1300rs Offline Send Email Dec 25, 2007
2:26 pm

Hi Rick, I use a Micropause = 4, and a Stepsize = 1. When I calibrate my Robo, I get a Max. Travel of 10254. I have found that the value of 4 for Micropause...
Frank S Barnes III
startestor Offline Send Email
Dec 26, 2007
2:05 pm

Frank: The info is much appreciated; I hadn't considered the Micropause inspite of asking the company directly. It certainly makes sense and I will give it a...
r1300rs Offline Send Email Dec 27, 2007
2:58 pm
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