...try shooting a star instead!
I have a Rubinar 500/5.6 that I have upgraded to a very sharp 'Astro' Rubinar. I also changed the focal length and addet an extension so that it is possible to grab the hand-grip of the E-1 when the lens is mounted.
More details about those modifications and some test images (including a daylight moon shot) are found in this thread and I have demonstrated some more practical handheld nature shooting examples here. I think I can safely say that this is one of the sharpest photographic mirror lenses that fits an E-camera.
I have used it once indoor (before the conversion) and twice outdoor (this week after the conversion) since I bought it.
Reply to this post if you have technical questions about the lens.
I'm looking for a second hand ZD 50 mm f/2.0 macro.
PM me or if you are interested in a swap.
Cheers, Jens.