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Message: <blockquote data-quote="Neil" data-source="post: 1251352" data-attributes="member: 1568">On the setup I was using yesterday I had the Olympus 25/2.8 mm lens on the E420, but you can use any short Olympus prime and you can try one of their short zooms too (the 14 - 42 zoom has a little vignetting but will work ) .  As I've mentioned I've used Nikon 28/2.8 , Nikon 18-55 zoom, Nikon 105/2.8 , Nikon 50/2.8 as well as the OM lenses.  It does depend a lot on the specs of your eyepiece as the Swaro 20x eyepiece have Eye Relief of 17mm , exit Pupil diameter 4.0 and 68 degree FOV ).For the older OM 55/2.8 mm lens I added an OM/4/3rds system converter to match it to the new mount on the camera. I have a Nikon lens to 4/3rds system adapter too.For the 25/2.8 mm lens the screw thread is in the front of the lens and it's too fragile to hang off the eyepiece so I just slide up close on my balance bar (see photo ).Use the eyepiece that gives you the widest field of view as eye relief is not so important , nor magnification, as the 4/3 rds system gives you a 2x mag factor to start with. The ideal range of camera lens for my 20x eyepiece would be  in the  20 - 50 mm range.I hope this helps, Neil.</blockquote>