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....hmmm... What is the practical meaning of my words? The dust mostly swamp from rear side, that's internal design of the lenses and we can't change it. If you take for example R80 with rear cap and try fast rotate the focusing ring it's will be with more forces instead open rear side, the internal vacuum will resist. Or u can hear low whistle of air if the cap not sealed enough. So for some kind of protect need to avoid rotation without rear cap, especially in dusty conditions, especially fast rotate. On the camera - ok, with rear cap...Show more →
Thank you very much for your explanation and illustrative example. I now can see how the illusion of dust on, say the interior rear element of an R80, is not exactly what it seems due to the complex nature of the lens elements and its groupings. One way I (try) sleep easy at night is to not shine a LED flashlight into the lens looking for dust.
Sorry for bringing this thread off tangent! Please, more photos!