I mounted a Nikkor 16mm fisheye onto a Leica via an adaptor: Yeah, I know, crazy. But I like to play and photography is nothing if it's not fun. I'm wondering if I can complete this contraption with a viewfinder. I found this on ebay: http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=400077737699&ssPageName=STRK:MEWAX:IT Seems very low-tech, possibly featuring a 'lens' from a door viewer. So, this is to ask, is there, or was there, ever a viewfinder for fisheyes?