I always thought fish-eyes were "gimmic" lenses, suitable only for wildly distorted images. Was I wrong! I got this as part of a used system I bought, and was going to sell it, but then I began using it. It conveys a wonderful sense of "being inside" the subject, especially up-close and personal. Avoid subjects with straight lines, and no one will even know it's a fish-eye. If you must include straight lines (horizon :-) run the most prominent line through the center, and it will remain straight. I also use it with the Olympus 7mm extension tube to "get inside" flowers. In such cases, be careful not to bump the front element on your subject!

Not specific to this lens, but proper exposure can be a pain with a fish-eye, as so much sky is included that it throws auto-exposure off and blocks up the shadows.

Small, light, and amazingly versatile if you don't abuse it's characteristics! In looking through my portfolio, I'm amazed at how often I use this "gimmic" lens.

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None

A very sharp and contrasty lens. There is little edge falloff in sharpness or contrast. In addition it is very compact and has built in orange and yellow filters.

The special lens cap needs some additional friction to keep it on.

If you need a semi-fisheye, I don't see how you could do better.

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Sigma 16mm