01-13-2020, 12:29 PM
Well, ok... let's see how this works in practice, I have doubts, to be honest.
Regarding non-extending lenses, I do disagree with your statement. Moving the inner lens groups moves air around, but only air that is in the lens already. So, in theory, there should not be any dust.
Practice shows: there is. But a lot less than in extending zooms.
Regarding non-extending lenses, I do disagree with your statement. Moving the inner lens groups moves air around, but only air that is in the lens already. So, in theory, there should not be any dust.
Practice shows: there is. But a lot less than in extending zooms.
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