Both the man of science and the man of action live always at the edge of mystery, surrounded by it. - J. Robert Oppenheimer
VISUAL -Orion XX12i -Orion 35mm Deep view, 26mm QC, 13mm Stratus -ES 9mm 100*
ASTROPHOTOGRAPHY -Nikon D700, too many lenses to count -Astrotrac -Atlas EQ-G
1987 Meade LX3 2120 10" SCT on hypertuned EQ6 Pro Baader Self-Mod Canon XS_CLS Clip Filter DSI color_Orion ST80 Coulter 10" Compact Odessey Dob http://www.astrobin.com/users/shawnhar
Quote:For learning astrophotography it's better you begin witha a short focal lenght telescope or lens, say 300-600 mm. When you master this FL then you can try longer FL and larger scopes. As Orlyandico said: "keep your hair".If you already have a scope for mounting on an Atlas then keep subexposures short and try bright objects like open and globular clusters. You can get great astrophotos quickly that way.Keep us informed.
Time spent looking at the stars is added to your life
Bashful, Misty, and little Ralphie - my heavenly stars
A-P 105 Traveler ~ TEC 140 ED ~ TEC 6 MCT
A-P Mach1 GTO ~ Losmandy GM-8 ~ TV Gibraltar
Quote:My AP setup includes an EM-200, a C9.25 (working at f/6.3), autoguided with a 400mm FL refractor + QHY5 (PHD). I can keep 80% of the subs on good nights, and I think an OAG is a good idea for less than average nights. I work with subs around 300-900 seconds. I have seen similar results with an Atlas + C9.25.
Astronomical League Member At Large
Black Hole Observatory
10'X16' ROR Observatory
Celestron 11" SCT
Celestron 8" SCT
Atlas 8" f4.9 Reflector
Orion Atlas EQ-G
A few REALLY good EP's
A few not so good
Deep Space Products
Quote:1) to use Hyperstar, you would want a dedicated astro CCD. You can't mount your D700 on the front of the SCT because its size would produce a large obstruction and the irregular profile would produce funny diffraction artifacts. Also the Hyperstar can't cover an FX sensor.You do know that with Hyperstar the camera mounts in front, right?2) Uncle Rod will say otherwise, but in my experience the f6.3 reducer can't even cover DX frame adequately, so FX is totally out.No offense, but considering that you say you need to self-fund, I would not go with a C9 or C11. These are long focal length scopes, and will require a lot of effort to get working well. "A lot of effort" = lots of money on the mount.
Quote:2) Uncle Rod will say otherwise, but in my experience the f6.3 reducer can't even cover DX frame adequately, so FX is totally out.
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Quote:Uncle Rod, I have given your statement a lot of thought. And I don't have a good theory to explain your findings. I can say though that the vignetting is very strong even on DX / APS-C sensor, in my experience.
Quote:The only "pretty picture" astrophotography I do is DSLR on my Kenko Skymemo. You have an Astrotrac. You can spend years with such a setup using lenses 200mm and less and there are scores of good targets on which to perfect your skills. I have never, ever, tried a 500mm on my Kenko and I am betting that my Kenko set on a Losmandy G-11 tripod is more stable than your astrotrac. I have used a 300mm which is pushing even my rig.Save yourself frustration, enjoy wide-field imaging for now, which can include some interesting variable work with a DSLR: see the Citizen Skies initiative. Google Citizen Sky.EdBTW I do photometry, but not with my C11, I use my SN8" with my ST402ME and photometric filters. Much easier on the tracking. Watch out for hyperstar: AAVSO suggests that it is not good for variable work. (No, I do not wish to debate this, just passing on information I have read.)Also, I feel that my C11 on a Losmandy G11 is pushing the limits for what I use it for: high resolution imaging with a webcam. I don't know much about the Atlas but I would not load it more than 50% capacity if you wish to do astrophotography through the OTA.
Quote:Taking the advice from everyone, I think that I will go with an atlas and a shorter focal length scope with my dslr, then move onto a CDC and bigger scope latter. The two that I've been looking at are the at6rc and the at65edq. I chose these two because they seem to be very good based on the reviews and they are cheap enough so that I won't have to sell my 12"Thanks