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REAP THE BEN­E­FITS OF a fist­ful of feat ures with your ne xt te le-zoom In­ter­nal fo­cus

Thanks to in­ter­nal fo­cus­ing, the front el­e­ment doesn’t ro­tate in any of the lenses on test, mak­ing cir­cu­lar po­lar­izer and ND grad fil­ters eas­ier to use.

Aut­o­fo­cus mech­a­nism

All of the lenses on test fea­ture ring-type ul­tra­sonic aut­o­fo­cus sys­tems with full-time man­ual over­ride, apart from the older of the two Tam­ron 70-200mm lenses.

In­ter­nal zoom

A bonus of the in­ter­nal zoom mech­a­nism fea­tured in all the lenses on test is that the phys­i­cal length doesn’t ex­tend at longer zoom set­tings.

Op­ti­cal sta­bi­lizer

The Sigma 50-100mm and non-VC Tam­ron 70-200mm lenses are the only lenses in the group to lack op­ti­cal sta­bi­liza­tion.

Jar­gon buster Con­stant-aper­ture

In a ‘con­stant-aper­ture’ zoom lens, the widest avail­able aper­ture re­mains fixed through­out the en­tire zoom range, rather than shrink­ing at longer zoom set­tings.

In­ter­nal fo­cus

With fully in­ter­nal-fo­cus de­signs, the large front el­e­ment re­mains fixed. Move­ment of the smaller rear or mid-sec­tion el­e­ments en­ables faster aut­o­fo­cus per­for­mance.

Aper­ture rat­ing

All lenses in the group have an f/2.8 aper­ture rat­ing, apart from the slower Nikon 70-200mm f/4 and faster Sigma 50-100mm f/1.8.

Weather-sealed mount

Most lenses have a rub­ber weath­erseal on their mount­ing plate, apart from the Sigma 50-100mm and 70-200mm lenses, and the older Tam­ron 70-200mm.

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