Canon 100-400mm L IS USM

Good contrast and colour.; Good AF speed that is quiet in use.; Nice focal range at acceptable 3:1 ratio; Holds its value well

May drag dust into the sensor

A popular lens that that is superficially well built but has a few quirks and an Achilles heel in the bearing problem. It is probably worth buying any extended warranty that is offered with it. If you get a good one it is well worth hanging on to but...

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Good contrast and colour.; Good AF speed that is quiet in use.; Nice focal range at acceptable 3:1 ratio; Holds its value well

Awkward manual focus at longer focal lengths; Known problem with bearings giving up the ghost; Wear in the bearings may well cause deterioration in performance.; May drag dust into the sensor

A popular lens that that is superficially well built but has a few quirks and an Achilles heel in the bearing problem. It is probably worth buying any extended warranty that is offered with it. If you get a good one it is well worth hanging on to but...