I am looking for a wide angle non fisheye lens 10-24mm for a APS-C crop sensor Canon T2I. I want to stay around the $500 price point. I don't mind if it is fully manual or has autofocus.
I've narrowed it down to about three lenses so far:http://www.bhphotovideo.com/c/product/819786-REG/Rokinon_24mm_f_1_4_ED_AS.htmlhttp://www.bhphotovideo.com/c/product/981706-REG/rokinon_16m_c_16mm_f2_0_ultra_wide_angle.htmlhttp://www.bhphotovideo.com/c/product/882235-REG/Tokina_atx116prodxc_ii_AT_X_116_PRO_DX_II.html
I mainly shoot astrophotography and I want to upgrade from my Canon 50mm f/1.4 to a wider lens so I do not need to stitch photos together anymore for wide shots.
I've seen some good reviews about the rokinon 24mm about it being really sharp and with f/1.4 it lets in a lot of light. Stepping it down to f/2.0 also makes it super sharp while still letting in plenty of light. My only doubt is using it with my crop sensor. All the reviews and images I've seen were done on a full frame camera so I am not sure. It will be a lot wider than my 50mm, but I am not sure if it would be wide enough for me.
That's where the rokinon 16mm comes in. It only has f/2.0 but that is still plenty. I haven't seen too many reviews or test images with this lens though, although I am sure it would perform just as well.
Then finally the Tonika 11-16mm f/2.8. This lens lets in the least amount of light out of the three, but has the widest adjustable view angle. I've seen some reviews on this lens vs the rokinon 16mm and the rokinon is sharper throughout all the stops except for f/22 where the contrast gets washed out (or at least in the review I watched). I am not to fond of the auto focus mechanism, but having an AF makes it a bit more attractive.
Also it must have circle lens filter threads so I can purchase the hoya intensifier filter (which is amazing by the way). Blocks out so much light pollution.
TL;DR looking for a wide angle non-fisheye for astrophotography.