Reviews and Problems with Sigma 4.5mm F2.8 EX DC CIRCULAR FISHEYE HSM
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sigma 4.5 Fisheye
5 November 2011
Summary: Well, it was o.k. but because of the vignetting I found that my autofocus just did not work well at all, the image is very small in the viewfinder too, and so judging manual focus was really difficult. The only thing is to visually inspect the distance by looking at the top of the lens.