Focusing Limiter Switch???

wxnut

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I just got a Canon L 70 - 200mm 2.8, and there is a focusing limiter switch on it. The manual tells how to select the 2 different settings, but doesnt say why you would want to.

The choices are 1.5m - infinity symbol
and 3m - infinity symbol.

How, when and why would I use this feature?

Thank you,

Doug
 
This switch is for when you want to limit or otherwise the length. Imagine this situation, you're shooting at birds (with the camera!) and there's some weeping willow branches hanging over you. As you pan, the camera goes woooo, a moving thing near to me, and snaps the focus onto the branch, loosing you that shot.

So essentially if you're shooting distant objects, and some small things are in the foreground within 3m, then the AF won't lock onto them.

Rob
 
This usually results in reaching focus faster also, since it doesn't have to hunt in as much of a range. That lens may not be susceptible to hunting, but I had a 100-300mm that was, especially if the limit switch wasn't on.
 

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