I'm shocked there isn't a place for these already! I hope to build up a fair collection of these eventually, but today I got my first, an SMC Takumar 35mm f/3.5 lens with an M42 mount. I took immediately went to play in the yard and picked up these images. I used a 12mm macro extension tube to bring my focus distance to about 6".
Carolina Anole by yorgasor, on Flickr
5D3_2675 by yorgasor, on Flickr
5D3_2690 by yorgasor, on Flickr
Carolina Anole by yorgasor, on Flickr
5D3_2675 by yorgasor, on Flickr
5D3_2690 by yorgasor, on Flickr