Reviews and Problems with Sigma 4.5mm F2.8 EX DC CIRCULAR FISHEYE HSM
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Fishy. Very, very fishy!
9 May 2013
Summary: A nice, ultra wide angle lens. The HSM focus drive is fast and quiet. One great added feature is the adapter for the lens cap. It has 72mm threads, so unlike most ultra wide angle lenses this lens can be fitted with a protective filter, which is very important for valuable lens optics. Granted the added filter causes some vignetting, but with the circular fisheye nature of this lens the small added amount of vignetting is not really an issue.
Summary: Image quality is superb, the contrast pleasantly surprised me. Even at f2.8 I do not see vignetting worth noting in the area of view - however, most of your image is of the barrel. I was surprised at how small the image circle, probably only 1/3 of the view finder is filled with the circle of view. I may yet return this because by the time you crop the image to get a print there isn't much resolution left to play with.
Pros: Clear Optics, Easy To Use, Firm Mount, Linear distortion, Strong Construction
Summary: This is a grat lens that you can have a lot of fun with and be very creative. Crop the image and it get's even better. Excellent quality. Nice to see a circular fisheye for less tahn full frame camera's.
Summary: I purchased this lens to match a full-frame circular fisheye on a Nikon D300. This lens fits the bill. The images are stunning and sharp. This is the only circular fisheye for less than a full frame sensor, but that is not the only reason to recommend it. It is a well made lens that delivers great results.