Hi everybody
I'm in the market for a decent telephoto lens for my Canon EOS 650D, which I will use together with my iOptron Skytracker, in order to take "deep" sky astro photos.
I been looking at the following lenses:
http://www.digidirect.com.au/camera_...sm_camera_lens
http://www.digidirect.com.au/camera_..._if_macro_lens
http://www.digidirect.com.au/camera_...dg_os_hsm_lens
I'm leaning most towards the Sigma, as it seems to be the best, the Canon lens is a bit slow being only f/4.
What is your thoughts on this matter? And yes I know it would probably be better to go for a fixed focal length lens, but this single lens would give me somewhat more flexibility
Regards
Anders