5

I don't even know what to call this thing. It's been sitting in a box of camera stuff for a while and I have forgotten where it came from.enter image description here

  • 2
    Can't tell, is there glass in there? Is it the same thread on both sides or is it reversed on one? It could be a reversing ring to mount a lens backwards for macro photography. – Itai Apr 22 '13 at 21:52
  • There is no glass, and the threads go the same direction. – cyanos Apr 29 '13 at 19:07
8

This looks like a spacer ring, which is used to add space between a lens and a filter (such as close-up filter) or other lens attachment to assist in focusing adjustment or increasing the angle of view.

Note, however, that using this could create some vignetting, especially on wide-angle lenses.

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