Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens
Hi, In addition to zooming, i can twist another ring around that moves a line from macro to infinity. What is this for? how am i meant to use it? I didn't get any instructions with my EFS 17-85 mm lens and am at a loss. thanks kate
Every lens has a natural range of depth for which it is in focus. The width of this range is called the "Depth of field". The macro ring moves this range closer or further from the camera. Use "macro" for focussing on very close scenes (less than 2 feet). Use infinity for photographing distant objects.
Posted on Apr 05, 2008
The extra ring is for "full time focus" or whatever it's called. Yes it is for manual focus, but with (some/most) USM lenses, that ring will also allow you to 'fine-tune' the focus without having to set the selector switch to Manual.
Posted on Dec 12, 2007
That is the focusing ring. I'm guessing your camera is set to focus automatically (Little switch on the side of the lens should have settings for either AF or MF, or something similar.)
If its on AF, you don't need to adjust the focus ring.
However, if you have problems with the AF (sometimes it has trouble, especially in low light) you can switch it to MF, and focus manually by changing the ring.
As a general guideline, the more you twist to towards macro, it focuses closer and closer, and infinity futher away (if you're taking a shot of the moon, you want it on infinity)
Posted on Dec 06, 2007
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