Very good for money, only budget ultrawide on FF, recomended.
7 June 2014
Summary: Original Nikon FF ultrawide 14mm 2.8 cost 1400$, this lens - about 325$. Most disadvantage is lack of AF, and some distorsion (can be fixed by software). AF not so critical on wide lenses but it most weak part of this rokinor/samyang/prooptic. Image qualty is good, its sharp even on f/2.8 and blade sharp on 4 and above. Focus ring very smoth - like nikon manual focus AI-s series. On my camera (d600) work all program mode (P,A,S,M), AF guide and AF confirm.
Summary: NOT AUTO-FOCUS, but great other-wise. Bought this lens for my Nikon D600 and I thought I read enough on it to understand everything I needed. I however misunderstood when it said it had a "chip" for Nikon cameras. That does not mean it auto-focuses, it just means it communicates with your camera about the lens settings. If you are not a person that is OK with manual focusing then don't bother with this lens.
Summary: This lens is about the best thing I have for my full frame DSLR's. On my crop frame cameras it is still a great wide angle and perfect for real estate which I use it almost every day. On a full frame it is 10 times better because of the larger sensor. This makes it much better for video and as a great alternative to a fisheye.
Summary: I could not be happier with this lens. I downloaded adobe's lens profile for it (Nikon D700 samyang 14mm f11) and the complex distortion is a thing of the past. This profile works pretty well with most full frame cameras. A friend of mine uses it with his 5DMk3. This lens is super sharp, even wide open. Coma is nearly nonexistent when shooting the stars at night. It reads f/2 in my camera, and the focus indicator works.
Summary: This is a great lens if you like to shoot manual. its a great rival to the Tokina 11-16mm, but obviously falls short of that lens in many features. but that lens will only cover full frame at 16mm. I put this lens on my 35mm camera and love the image. A great deal!
Summary: This is a totally manual lens, this is a good thing. Instead of wading through menus you simply twist the lens. The forces is very sharp and forgiving. The aperture is simple. Check out the photo moon over pond with, shooting guns (regular ammo, no tracers).