Quote:
Originally Posted by RickS
Lewis,
I'd be looking at your image scale rather than f/ratio to decide if you've got the right set up for imaging galaxies. Of course, aperture will determine how long it takes to capture decent SNR 
A FSQ-106 @ f/8 would be OK for the larger galaxy targets. With drizzle you'll get halfway decent resolution. It will need a fair amount of capture time to get a quality image.
If you want to go for more exotic targets then larger aperture is needed unless you have a lot of good sky time and patience.
Cheers,
Rick. |
Which is why I built the RN 8F8 Newt. 8" at F8. Weather has been extremely uncooperative for testing and I am build a guiding solution for it but some unguided 20 sec frames @ 1600 ISO on Eta C gave me a much better SNR in a fraction of the time. Enough for me to pull quite good results off a single frame. It seems to handle a 2" Barlow well ( F16 !! ) so the combo should give me some capability with smaller targets, planetary and DSO. F8 also gives me an almost coma free FOV and it's proved to be a very good mirror.
It's a sod in the Ob though, being 1600 long it nearly touches the walls
