Not sure the samyang 14mm is wide enough for astro on a crop it's great on a full frame though!
spec me lenses (safari, astrophotography)
- Thread starter Glaucus
- Start date
Not sure the samyang 14mm is wide enough for astro on a crop it's great on a full frame though!
The are actually 4 versions
Two non OS models : The original and a DG upgrade with revised tripod mount.
Two with OS : As you described.
I sold my Canon 100-400 for a 2nd version of the 120-300 F2.8 and it was so much better.
As an outdoor lens you rarely need OS when you have F2.8
Hmm Astrophotograhy is.. about the mount, then scope/camera (close second/third).
A 300mm lens would do good as you don't need stupid money to make longer tracking exposures. Normally the lens is wide open - and that's when it causes a problem as most lenses can't do wide open without some aberrations unless they charge stupid amounts.
The scope I use is an APO 670mm f6.38 native (doublet at the front then doublet field flattener built in). It's just 1:1 manual focusing, but I've added a borg focuser for camera 'twist-to-focus' at micron level. It's great for deep space objects but it could do with more speed - possibly f4-f5.
For planets you're looking at 2500-6000mm focal lengths and as they're bright it's not unheard of to have f20.. I use a 5x powermate giving 3350mm f32 for planets but the main issue is stability at that focal length. I've also shot the sun (with white light filter) at 6700mm f64 although there is some softening due to dawes limit.
There's never a scope/lens for all occasions. However a 300 f4 would give nice wide field, however beyond that you're into the very expensive Canon lenses - I seen them, seen through them, seen images from them.. but I couldn't give a objective view on it.
A 300mm lens would do good as you don't need stupid money to make longer tracking exposures. Normally the lens is wide open - and that's when it causes a problem as most lenses can't do wide open without some aberrations unless they charge stupid amounts.
The scope I use is an APO 670mm f6.38 native (doublet at the front then doublet field flattener built in). It's just 1:1 manual focusing, but I've added a borg focuser for camera 'twist-to-focus' at micron level. It's great for deep space objects but it could do with more speed - possibly f4-f5.
For planets you're looking at 2500-6000mm focal lengths and as they're bright it's not unheard of to have f20.. I use a 5x powermate giving 3350mm f32 for planets but the main issue is stability at that focal length. I've also shot the sun (with white light filter) at 6700mm f64 although there is some softening due to dawes limit.
There's never a scope/lens for all occasions. However a 300 f4 would give nice wide field, however beyond that you're into the very expensive Canon lenses - I seen them, seen through them, seen images from them.. but I couldn't give a objective view on it.