Lenses

Build quality
Optical quality
Value for money
Overall

Cons: Lateral CA is high, but can be corrected. APS-C only, but that reduces costs.

Pros: Ridiculously good value. Solid build. Manual aperture and focus saves money, but doesn't compromise usability due to the vast depth of field. Pin sharp from corner to corner at f/5.6 and contrast is amazing. The distortion is more natural than other fisheyes. Almost impossible to get lens flare.

Summary: This is a perfect fisheye. Fisheyes are used sparingly, so spending more than $500 is impractical which means all the others are too expensive. This is sharp, contrasty, small and great value. Set the aperture to 5.6, focus near infinity and enjoy shooting!

Build quality
Optical quality
Value for money
Overall

Cons: Not so sharp on 16mpx D7000. Very sharp on 12mpx D300S.

Pros: Colour rendition, flare resistance, fisheye distortion is always fun, AE version gets correct exposure and you can forget the aperture ring entirely.

Summary: Very good on D7000, excellent on d300S. I have the newest AE version. Meters correctly

Build quality
Optical quality
Value for money
Overall

Cons: None... ok, maybe an AF version it would be nice, but that means higher price. Anyway, i like the retro feeling of the manual operation, and for this kind of lens, AF is not so important after all.

Pros: Excellent build quality!!! Very good optics Sharpness (even in the corners) 180 FOV Fun to use Very cheap!

Summary: Absolutely flawless!

Build quality
Optical quality
Value for money
Overall

Cons: Focusing ring problems on some units (see on summary)

Pros: Great image quality even at corners. It actually fills the entire frame with image (no round corners), on an APS-C sensor camera. Rock-solid built. It looks nice and modern, not like a pre-cold war instrument (unlike the old peleng). Super easy to use, even for a beginner! Built-in hood. Almost zero flares even pointing it to the sun! Did I mention great image quality? The best bang for the buck!

Summary: This lens is just awesome, If you can't decide between this and a peleng, give it up, go for the samyang (also manufactured under different brands: rokinon, pro optics, falcon, etc. but basically it is the same lens). This lens won't disappoint you, it will give you more than what you expect, hands down. The ONLY single problem I can find on this, is that some units came "uncalibrated" in the focus ring; for instance, if you want to focus an object that's 1 meter away from the sensor you are supposed to spin the focus ring where it marks 1m.. well, some units give blurry pictures with this because probably the 1m focus point is gonna be on the infinity mark... there are information on the net to find out how to recalibrate it and it is easy as hell. Also, let me note that this only happens on f3.5, move it one stop smaller and problem solved (if you don't want to recalibrate it). Note that this does not happen to ALL of them, only some units came uncalibrated. My lens (under the rokinon brand) did not have this calibration problem and I am very happy with it; I bought it in amazon (US$ 260)

Build quality
Optical quality
Value for money
Overall

Cons: The DOP is so great that it's sometimes easy to forget to focus.

Pros: Well built, optically good, everything you can ask for in a fisheye.

Summary: A great lens, even greater considering the price. I spent days just walking around playing with it. You rediscover everything through that eye.

Build quality
Optical quality
Value for money
Overall

Cons: Big minimal focus distace,after f/3.5 is f/5,6 nothing between, no electronic info for camera - AE problems with lower models of Nikon

Pros: optically good lens, price, not too much distortion, on f/5,6 fall-off is gone

Summary: I love this lens. It should be smaller but it don´t mind so much. I use 2 focus setting - MFD for closer shots; 0,7m for everything else.