DC.watch (google translation here) tested the rare Schneider Makro-Quinon 55mm F1.9 lens ([shoplink 22691 ebay]here on eBay[/shoplink]) on the PEN-F. The very unique feature of the lens is that it can extend the lens length by quite an impressive amount:
[shoplink 22691 ebay]
It delivers a unique kind of rendering so be sure to check out the image samples posted by DC.watch (google translation here).