This past winter I bought a Nikkor 50mm F2.8 enlarger lens off eBay for a whole $20.00. This lens has a reputation as a good sharp macro lens when reversed on a bellows. So using a couple of $2.00 adaptors (also off eBay) I tried mounting the lens (reversed) on a vintage OM telescopic auto extension tube 65-116 on my OM-D EM-5 body. The result was magnification of almost 2:1 with the auto extension tube collapsed, and almost 3:1 with it fully extended. Surprisingly, the working distance is very respectable at 6.5cm (collapsed) and 5.5cm (extended).
The photo below is the best result of my first test of the lens. All-in-all Iím reasonably satisfied. I expected some loss of resolution due to the extension, but it didnít turn out too bad. The image has higher contrast and more muted colours than what I get when I shoot with my Zuiko 35mm macro. So this set-up definitively doesnít produce images as nice as the Zuiko, but the price was certainly right; and I was able to photograph a tiny insect taking a drink from a drop of syrup...and thatís pretty cool!