Fea­tures to look for …

Make sure you get what you re­ally need from a wide lens

NPhoto - - Test Team -

At­tach­ment thread

Lenses that have a built-in lens hood don’t have an at­tach­ment thread for fit­ting screw-in fil­ters or an adap­tor ring for square or rec­tan­gu­lar fil­ter sys­tems.

Aut­o­fo­cus

Most lenses have built-in aut­o­fo­cus ac­tu­a­tors, whereas the Sigma 20mm is driven from the cam­era body. The Samyang lens only al­lows man­ual fo­cus.

Prime or zoom

Prime lenses tend to be smaller and of­ten have wider avail­able aper­tures, but this isn’t al­ways the case. Many pre­fer the ver­sa­til­ity in com­po­si­tion of­fered by zoom lenses.

Lens hood

Whether built in or sup­plied as a sep­a­rate, de­tach­able item, lens hoods help to com­bat ghost­ing and flare, which can be prob­lem­atic in wide-an­gle shoot­ing.

An­gle of view

It’s worth check­ing the ac­tual an­gle of view for a lens (see com­par­i­son ta­ble, page 100) as it can be dif­fer­ent in com­pet­ing lenses at iden­ti­cal fo­cal lengths, for ex­am­ple the Nikon 14-24mm and Samyang 14mm.

Weather-sealed mount

All the Nikon lenses in the group, plus the Tok­ina lens, fea­ture a weatherseal ring on their mount­ing plates. This helps to guard against the ingress of dust and mois­ture.

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