I got a reversing ring recently, and after putting it on one question I had not thought of came up...is there an increased risk of getting the lens dirty or damaged. (if it matters, I have an m43 Sigma and m43 Olympus lens and Minolta legacy lens)
I don't know if Minolta made one, but Nikon made a BR-3 adapter that attached to the exposed mount end of the reversed lens & it allowed for a filter to be screwed into it to protect the rear element (Upon which damage is more noticeable than damage to a front element of a lens)
The exposed rear element of any lens is at risk of scratch damage. Of all the reversed-lens users I know, none added any filters for protection; all reversed lenses were used quite carefully, as is.
I got my reversed 35mm lens in the sand photographing ants up close and personal. Even after carefully brushing lightly with a quality paint brush and blowing on it I still got some sand I believe behind the small ball bearings. It goes on Real tight now, but still works. I now have the nikon aperture ring adapter that makes contact with anything I get close too.
I also only use the cheap ebay bought lens to reverse now. They are just as good if not better.
Maybe I'm missing the point, but isn't this just a simple fix? Use a standard rear lens cover with the center cut out just for the lens.
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