Th­ese lenses are ul­tra-wide and un­cor­rected

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Aptly named for their ex­treme cov­er­age (180 de­grees for the Nikon ver­sions), fish­eye lenses trade straight-line cor­rec­tion for a wrap­around view. Th­ese were in vogue in the 1970s, and there used to be many dif­fer­ent de­signs, with the ba­sic dis­tinc­tion be­ing be­tween cir­cu­lar (pro­ject­ing a cir­cu­lar im­age on the sen­sor sur­rounded by black) and the self-ex­plana­tory full-frame. The ex­treme im­agery pos­si­ble made them a nov­elty ini­tially, but the over­whelm­ing bar­rel dis­tor­tion can make any­thing more than oc­ca­sional use repet­i­tive and over-the-top. Nikon pro­duces what is es­sen­tially the same lens in FX and DX for­mat – the Nikon AF 16mm f/2.8 Fish­eye and the Nikon AF DX 10.5mm f/2.8G Fish­eye.

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