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What does the focus limiter swith do?

Jose Carlos , Dec 19, 2003; 09:28 a.m.

Could anyone tell me what the "focus limiter" switch does on the EF 300mm f/4 Lens? I know you can set it from 6 meters to infinity but what is the benefit of this?

Many thanks!


Mike Smith , Dec 19, 2003; 09:59 a.m.

The lens "hunts less" whilst trying to focus lock, rather than going from minimum to maximum focus and thereby taking longer, it is scanning the range of 6 metres to infinity only.

Therefore the only advantage/effect is the time the lens is taking to find focus. This can be critical for action sports situations, ie the difference between getting a shot and not, but not relevent if you are shooting static subjects.

Ron Chappel , Dec 20, 2003; 07:34 a.m.

a 6 meter limit may sound abit pointless but it's fairly close to a 300mm

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