Okay, thanks guys for the answers.
I should have made it clear that I'm not using a DSLR but a point and shoot sony DSC-W1.
I just wondered if any SLR lens fitted onto 37mm threads, or any converters, but it doesn't look like it.
Oh well, I'm hoping my next cam upgrade will be a DSLR.
Edit: I have checked out the sony site (the first place I went ot in fact), but their digicam lens are limited in terms of range and function. But I still will purchase one in the future.