After I bought a Canon HD camcorder (HF100), I started reading about 35mm adapter enabling the use of SLR lenses on video cameras.
The solutions you can buy are very expensive, so I researched a DIY solution. I ended up making my own adapter from macro tubes and converters (ebay) and a ground glass and holder from http://www.gt35pro.blogspot.com/. For all the parts I ended up paying around U$90.
The adapter is a non-vibrating one but I’m pretty pleased with the image quality. The problem is that it vignettes very heavily, and I mean really heavily. The corners are really dark, which makes footage look very 8mm-ish. Bokeh is nice with the Canon 50mm f1.4. Also, when filming, the image is upside-down and mirrored, so it takes a while to get used to following action. Hand held filming with a 50mm lens is also pretty hard in itself, but it certainly makes the images different from normal video.
This footage is all hand held with no post, so forgive me for the shaky pictures and occationally (heh) out of focus stuff: