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Autofocus is the ability of a camera/lens system to automatically adjust the focus of the lens via a motor attached to the focus group of the lens. Contrast with manual focus.
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Is it normal for autofocus to struggle when using a variable ND Filter?
I recently bought a Marumi variable ND filter and I've been testing it on my 24 - 105mm F4 and 70 - 200mm F2.8 Canon lenses. It seems that my lenses have a hard time focusing when the ND filter is att …