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.html
http://www.bhphotovideo.com/c/product/981706-REG/rokinon_16m_c_16mm_f2_0_ultra_wide_angle.html
http://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.
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TL;DR looking for a wide angle non-fisheye for astrophotography.

I am inclined to suggest Canon's 10-18mm lens. It's just $280, well below your price point. Gives you the leeway to spend on ND filters, a polarizer if you need that, and/or anything else.

That seems like an okay lens but seems a little on the slow side for what I want to do. I was thinking of a prime lens at least F/2.0

Tamron's 11-16 is an alright choice if you need fast and ultra wide.

If you just need something like 20mm, maybe Sigma's 20mm f1.4 lens.

I don't quite understand your question/needs. What focal length do you need? The difference between 11mm and 20 or 24mm is huge.

My needs are a landscape wide angle lens for astrophotography that does not fish eye and is fast.

I listed a few seeing if anyone had used them, and then proceeded to ask for more wide angle lenses with reviews.

I thought this was pretty obvious from the first post lol.

As of right now I think I am leaning towards the rokinon 16mm. I'd really love to find some side by side comparisons of shots taken with the 24mm and the 16mm focal lengths on a crop sensor. There isn't much out there for side by side comparisons.

The difference is significant. I'll find a focal length comparison visual for you later. I can't stress this enough: the focal length you choose matters. I would go with a zoom. The Tokina 11-16 really is a great choice.

The rokinon likely won't resolve well on a crop. Again I'll try to find some examples.

The full frame lenses you've listed (many of the uwa primes) are fairly bad on full frame. On crop that means even less sharpness. Better corners, but otherwise worse performance.

Edit:

Here is a focal length simulator. It doesn't do justice the big difference between each focal length. 20mm and 24mm on DX is a big jump, and 24mm to 35mm is an even bigger jump. Each focal length serves slightly different purposes, and you can't really be certain of what you need. http://imaging.nikon.com/lineup/lens/simulator/#DX

Here is an example of my work at 15mm on full frame (10mm crop sensor equivalent). I could have wiggled around wider or longer by a couple mm, but for that scene 15mm was pretty useful. 20mm wouldn't have cut it. https://c2.staticflickr.com/8/7561/27461427793_9756e862bb_k.jpg

This post was edited by Canadian_Man on Jul 11 2016 11:10pm

After playing with that I think 16mm would be my ideal focal length. I still have a few paychecks to go before I commit to a purchase so I have some time to shop around and read more reviews.

Based on personal experience, I would go with the Tokina 11-16. I've shot some of my best landscape shots with this lens. You wont regret