I was way off!!! But that's only because I'm a bit 50mm 1.4 happy these days... bought one a while back and I still haven't taken it off. Now, everything looks 50mm(ish) to me... even this page seems to have a vignette and a shallow DOF. It's the subject that got me... old cars and the art that went...

Can anyone guess what it is? Without cheating and snagging the exif data?

That looks a lot like a 50mm 1.4/1.8... possibly shooting with an ND2 filter... or up around 6400/8000 shutter...?

Awesome shots BTW. Are you on Flickr?