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Orion Starshoot II FOV
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   Astrophotography & Sketching -> CCDsMessage format
 
paulr
Posted 2/6/2010 5:32 PM (#27208)
Subject: Orion Starshoot II FOV


Member Junky

Posts: 7
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Location: Delaware		Hello everyone, I just found this site last night and I am really enjoying the information here - A lot of folks here have almost the same set up has I do, and it's encouraging to see those results. I was trying to set up skysolve and one of the settings is FOV, I was hoping someone could tell me how to figure this out? below is the list of equipment that I have, I know you can set up your FOV in Starry Night, but mine FOV always seems to be smaller in the picture that I take then on the screen, and I am sure I use all the right setting for my equipment.

What FOV I am trying to figure out is looking thru my 8" SCT with F3.3 and using the Orion Starshoot II Color (wish it was the Pro), I have a pier that I made out back, and I keep the scope out there on a Atlas EQ-G mount beneath a home made box made out of insulation board. I have a side by side with a Stellarvue SVR80EA Raptor, and I use an Orion Starshoot II, plus a unmodified Canon 450d, I ran all the cables inside my shed, which is insulated - (heated & AC) Any way I am getting off track, I would like to play with Skysolve, but I need to figure out my FOV's any help would be greatly appreciated...

Secound thought, has anyone tried the WS2 coating that is mention on the home page? I am trying to figure out if I should get that done, or send my cannon out to be mod. Only so much money to go around.

Thanks again

Paul
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mosheriffic
Posted 2/6/2010 6:29 PM (#27211 - in reply to #27208)
Subject: RE: Orion Starshoot II FOV



Expert Junky

Posts: 2696
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Location: Marysville,Wa 48.07N-122.21W		Hello Paul and WELCOME to Andy's place!!
Here is a very handy program that will calculate your FOV from the specs that you enter. CCD CALC :
http://www.newastro.com/book_new/camera_app.php
Have fun!!

Edited by mosheriffic 2/6/2010 6:31 PM
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paulr
Posted 2/6/2010 6:47 PM (#27213 - in reply to #27211)
Subject: RE: Orion Starshoot II FOV


Member Junky

Posts: 7
0
Location: Delaware		Thanks Ron, You know I look at this program all the time to fram my pictures, and never notice the FOV on the bottom of the pitures - unreal.

I was wondering, can you please tell me is it normal for the pictures through CCD calculator or Starry night to be off the actualy photograph? What I mean I normally look at CCD Calculator or the FOv on Starry Nightpro before taking a photo, and what I find is that my actually photo is always a little smaller then the one both programs show. Normally I try turning the photo's to line up the stars but they never match. I know I have the settings set right. It's not that importanat juct an observation for me.

Thanks
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mosheriffic
Posted 2/6/2010 7:35 PM (#27215 - in reply to #27213)
Subject: RE: Orion Starshoot II FOV



Expert Junky

Posts: 2696
2000500100252525
Location: Marysville,Wa 48.07N-122.21W		Paul, the only thing that I can think of is that to calculate FOV, one must assume a nominal focal length. I've been reading recently, that SCT's in particular, can have a significantly longer focal length when accessories are added to the optical train. This would include visual backs, T-ring, adapters, filters, filter wheels,ect.
Some of our wonderful members will be able to shed more light on the subject, I'm sure!! In the mean time I will do my home work, cause now I really want to know how to calculate the true focal length!
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paulr
Posted 2/6/2010 9:43 PM (#27220 - in reply to #27215)
Subject: RE: Orion Starshoot II FOV


Member Junky

Posts: 7
0
Location: Delaware		Thanks Ron, I found this in a book (Introduction to Digital Astrophotography, by Robert Reeves)

F= 57.3/L x X

F= field (width, height or diagonal) in degrees
l= lens focal length in length units
x= image sensor (width,height or diagonal) dimension in same length units.

Never be great with math, tomorrow I will take another look, thanks again.

Paul
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perlmeister
Posted 2/7/2010 12:55 AM (#27229 - in reply to #27208)
Subject: Re: Orion Starshoot II FOV



Elite Junky

Posts: 800
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Location: Denver		Here is another place that will give you a program for fov's and cameras

http://www.astronomics.com/main/multimedia/ccd_calculator.zip
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Rich
Posted 2/13/2010 11:09 PM (#27534 - in reply to #27208)
Subject: RE: Orion Starshoot II FOV



Elite Junky

Posts: 895
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Location: Shelburne Falls Mass.		Welcome!
I imaged for a long time with an 8 inch SCT and the starshoot 2. I also tried the meade F3.3 reducer as well. One thing is that the field of view of the starshoot 2 is tiny. Make sure with CCDCalc that you are entering in the correct info for the starshoot 2's chip. They are on the orion page under the starshoot 2's spec's. Make sure you put in the pixel size correct, they aren't square. The size is 8.60 x 8.30 . With the size right it hits it dead on or so close it really doesn't matter because then your splitting pixels. About the box coming up off the image, mine does that too for some reason. Good luck with that imaging setup! May the force be with you!

Rich
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