Fea­tures to look for …

Ob­vi­ously size is im­por­tant – but there are some other phys­i­cal fea­tures to con­sider

NPhoto - - Test Team -

Full-frame

All of the lenses we’ve tested this is­sue are FX-com­pat­i­ble, which means you can use them on full-frame cam­eras with­out re­sort­ing to crop mode, and also on any DX-for­mat mod­els.

Fo­cal length

When fit­ted to an FX body, 35mm, 50mm and 85mm lenses work well for wide-an­gle, stan­dard and short tele­photo pho­tog­ra­phy re­spec­tively.

DX fit

When used on a DX body, 35mm lenses give a ‘stan­dard’ per­spec­tive (thanks to an equiv­a­lent fo­cal length of 52.5mm), while 50mm lenses, equiv­a­lent to 75mm, work well for por­trai­ture.

Di­aphragm blades

A greater num­ber of di­aphragm blades typ­i­cally helps to give a more rounded aper­ture, which can boost the qual­ity of the bokeh (see box, be­low).

Fil­ter thread

The at­tach­ment thread size of the lenses on test ranges from 58mm to 77mm. None of them has a front el­e­ment that ro­tates dur­ing fo­cus­ing, so it’s eas­ier to use cir­cu­lar po­laris­ers and ND grads.

Aut­o­fo­cus

The two Samyang lenses in the group can only be fo­cused man­u­ally. All the oth­ers have quiet, ring-type ul­tra­sonic aut­o­fo­cus.

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