Bennet0602 Posted December 21, 2021 Share Posted December 21, 2021 (edited) Ive seen these on ebay for really cheap and i was wondering if they are any good? Around 200mm is in my opinion a really cool focal lenght and a aperature of f4 is pretty good compared to other cheap telephoto lenses (like my 75-300mm kit) with f5.6 or 6.3 so i wanted to ask if some of you guys may have experience with these lenses? The setup i would run with a lens like this would be my unmodified Canon 450d along with a tripod and a tracker. Edited December 21, 2021 by Bennet0602 Quote Link to comment Share on other sites More sharing options...
TerryMcK Posted December 22, 2021 Share Posted December 22, 2021 Zoom telephoto lenses are not a good idea as they have multiple elements within that can give strange artefacts to stars especially at the edge of the field. A prime lens is a better idea although you will still have to stop down even with those to minimise odd looking stars. A lot of people use the Samyang 135 F2 but that is expensive. I have a Canon F/1.8 50mm prime lens that fits on my old 400D very well despite it being an EF lens. You can pick those up for under £100 brand new. However that produces ultra wide views of the sky so if you can get a prime in the ballpark of 130mm to 200mm all the better. Quote Link to comment Share on other sites More sharing options...
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