Question about Canon EF 70-300mm f/4.5-5.6 DOIS USM Lens
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Posted on Jan 02, 2017
Check your diopter adjustment. It should be a small wheel on the upper right of the viewfinder. It is designed so that people who normally wear eyeglasses can use the viewfinder without their glasses, but it can occasionally get bumped. If the diopter adjustment is way off, it is like looking through someone else's eyeglasses!
Posted on Mar 18, 2008
There is no battery in the lens. The lens receives power from the camera. Whether or not the lens is getting power, though, you should be able to focus manually.
When you say you can't focus manually, do you mean that you can't turn the focusing ring on the lens, or that when you turn the ring the image does not come into focus?
If you decide the lens needs to be repaired, I recommend sending it to Canon. You can go to their website (canonusa.com if you're in the US), click on support, and follow the links.
Posted on Dec 26, 2008
SOURCE: looking for a manual
I coulnd't find a manual. I did see a detailed specification page here:
It shows no manual is available for the lens.
Posted on Jul 18, 2009
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