Question about Sigma APO 70-200mm f/2.8 EX DG HSM Lens
Sounds as if your diaphragm may be sticking due to either the camera or the lens. Look at the back of the lens and work the small tab with the aperture ring set to f32 (or 22). See if the tab moves smoothly but with resistance from a spring, or if it sticks or moves roughly. If it does this with other lenses too, another possibility is the aperture lever on the camera. Mount the lens and set it for f22 or so and use your depth of field preview to see if the lens is stopping down smoothly. In either case it may need professional repair.
Posted on Nov 03, 2007
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Posted on Jan 02, 2017
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