I bought this from University Optics to allow the use of Minolta bayonet base 35mm SLR lenses to be used on my cookbook CCD camera. The adapter has the correct spacing to allow optimum focus. If you want to take widefield images with your cookbook CCD (and perhaps other screwmount cameras?), this will do the trick. If you don't already own Minolta camera lenses, they can often be bought on auction sites for a very low price.
New price from University Optics is $60.
$35 shipped within the US.
(has been sold - thanks Terry)