RWR wrote:
If there is any slop at all, I would not even think of using it. I always had my slide film processed only if I sent it out, and mounted them myself in anti-Newton ring glass mounts. There can be some variation among different depth-of-field tables, but the Leica table I use says for 1:1 it’s 0.79mm @ f/5.6, 1.09mm @ f/8.0 and 1.50mm @ f/11.0.
Thanks for the spec. I just measured the wiggle in my Nikon ES-2. Holding the device as it would be mounted on a lens, I pushed gently down to take out the play. The top v.s bottom length differs by a half a millimeter fully collapsed and about 2/3 of a millimeter when fully extended. I would only use this device if mounted vertically, to maintain parallelism.