Question about Canon EF 70-300mm f/4.5-5.6 DOIS USM Lens
When I use a linear polarizing filter on my 70-300 DO lens, it cannot be made to focus. I don't mean it has trouble focussing on Auto, I mean even on Manual it cannot be focussed. Probelm disappears when using a circular polarizing filter. Obviously, that's the fix, but is the problem related to the Diffractive Optics lens' physical structure? Just curious. Very pleased with lens sharpness and performance otherwise. The perfect travel lens.
No, the problem is not with the lens. Your Canon camera requires unpolarized light to focus. Even on manual focus, you may have trouble seeing focus through the viewfinder. That's why they invented circular polarizer.
Posted on Jan 20, 2010
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Posted on Jan 02, 2017
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