10 things to watch out for

Here are a few things to help cover the dis­tance when shoot­ing with a telephoto zoom

NPhoto - - Test Team -

1 Size mat­ters

The larger lenses in the group we’re look­ing at prob­a­bly won’t fit in your gad­get bag or photo back­pack, so you’ll need to carry an ad­di­tional bag.

2 Weight for it

Even pro­longed pe­ri­ods of hand­held shoot­ing are fairly com­fort­able with lenses that weigh around 2kg or less.

3 Get a leg up

A sturdy mono­pod makes an ex­cel­lent sup­port for heav­ier lenses, while still en­abling free­dom of move­ment.

4 Go steady

Op­ti­cal sta­bil­i­sa­tion can make for much sharper telephoto images when you’re not us­ing su­per-fast shut­ter speeds, both for hand­held shoot­ing and when us­ing a mono­pod.

5 De­layed ser­vice

For tri­pod-mounted shoot­ing, the ‘ex­po­sure de­lay’ func­tion or ‘mir­ror-up’ drive mode are great for avoid­ing blur caused by mir­ror bounce.

6 Truly tele­scopic

The 1.5x crop fac­tor of cam­eras with APS-C im­age sen­sors can give a hefty boost to the ef­fec­tive reach of any telephoto lens.

7 Di­min­ish­ing re­turns

Once you get to a fo­cal length of 500mm, the ad­di­tional 100mm of a 600mm lens doesn’t ap­pear to make a mas­sive dif­fer­ence in out­right reach.

8 On the tele

Tele­con­vert­ers are com­pat­i­ble with most of the lenses on test. How­ever, the re­sult­ing widest aper­ture may be too nar­row to en­able aut­o­fo­cus, and can give a dark viewfinder im­age and slow shut­ter speeds.

9 So shal­low

Even at aper­tures as wide as f/8, long telephoto lenses can give a shal­low depth of field when shoot­ing ob­jects that are only a few me­tres away.

10 That’s the limit

Fo­cus-range lim­iter switches can speed up aut­o­fo­cus in tricky con­di­tions by avoid­ing hunt­ing through the shorter end of the fo­cal range.

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