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FOR TRACK AND FIELD, AS WELL AS OTHER SPORT­ING EVENTS, HERE ARE A FEW FAC­TORS TO CON­SIDER

NPhoto - - Gear Zone -

WEATHER SEALS

All the lenses in the group have a weather seal ring on the mount­ing plate, and some have ad­di­tional seals around joints and switches.

TRI­POD COL­LAR

This en­ables a bet­ter bal­ance for heavy lenses when placed on a tri­pod or mono­pod, es­pe­cially dur­ing por­trait-ori­en­ta­tion (up­right) shoot­ing.

AUT­O­FO­CUS SYS­TEM

Ring-type ul­tra­sonic aut­o­fo­cus sys­tems are typ­i­cally quick in op­er­a­tion, es­pe­cially in the type of tele­photo lenses on test, where rel­a­tively light­weight in­ter­nal el­e­ments are moved to achieve fo­cus­ing.

FO­CAL LENGTH

For mo­tor sport and other events where you can’t get phys­i­cally close to what­ever you’re shoot­ing, you’ll of­ten find that you need a lens with a fo­cal length con­sid­er­ably longer than 200mm.

ZOOM OR PRIME?

Zoom lenses of­fer a de­gree of ver­sa­til­ity that’s im­pos­si­ble to get from a fixed fo­cal length lens, while su­per-tele­photo prime lenses also tend to be very ex­pen­sive.

STABILISATION

Op­ti­cal stabilisation, also called VR (Vi­bra­tion Re­duc­tion) or VC (Vi­bra­tion Com­pen­sa­tion) by man­u­fac­tur­ers, can be a mas­sive bonus when us­ing long fo­cal lengths for hand­held or mono­pod-mounted shoot­ing.

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