"but need to test if it doesn't impact quality of photos took without attachments screwed (reflections due to screw thread, etc)."

I'm not sure this would matter as you would only be using this cover with the zoom lens on. You would probably have to disable the flash as this would just light up the inside of the cover.

A common size for a good lens seems to be M42 but I'm not sure if there is enough space to accommodate the hole needed. If I can't find a smaller standard for good lenses, there are a few iphone cases with screw in zoom lenses. Not ideal I know but probably cheaper.

Anyway, a separate back cover for a zoom lens would require a good bit if interest to make it worth your while I guess.



http://www.ebay.ie/sch/sis.html?_nkw...+Screw+Fit+v+g