have a look at a Nikon FC-E9 http://www.cs.mtu.edu/~shene/DigiCam/User-Guide/lens/5700-lens-fish.htmlwith a 24 mm lens on DX you will get a full 186 deg circle I stick it on my 10-20 sigma at 20mm just mount it with step up rings no spacer tube required ..fabulus..auto focus works toif I could work out how to post a photo I would post one !!
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