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Wide view­ing an­gles are of­ten ac­com­pa­nied by wide-rang­ing fea­tures

Lens hood

The Samyang 14mm and Sigma 20mm lenses have built-in hoods and there­fore no fil­ter at­tach­ment thread. All other lenses are sup­plied with a bay­o­net-fit, pe­tal-shaped hood.

Fil­ter thread

All lenses on test have in­ter­nal fo­cus­ing, so the front el­e­ment nei­ther ex­tends nor ro­tates, and all but two (the Samyang 14mm and the Sigma 20mm) have a fil­ter at­tach­ment thread. Auto/man­ual fo­cus The Nikon and Sigma lenses on test have ring-type ul­tra­sonic aut­o­fo­cus, which is fast and whis­per-quiet, with full-time man­ual over­ride. The Irix, Samyang and Zeiss lenses are purely man­ual fo­cus.

Weather seals

The Samyang and Sigma lenses have no weather seals, the Nikon lenses have a rub­ber seal on the mount­ing plate, and the Irix and Zeiss lenses have full weather seals.

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