Yeah, I never tried it before. It works nicely! Only thing is you get really close with the lens and that cuts out lighting, and focus is such a small area I ended up moving the tripod back and forth fractions of an inch to get focus where I wanted it. Focus point was about one inch from te back end of the 50mm.
I'm looking for a good macro lens for taking pictures of IC's and circuit card runs, and with the lens will probably get the macro flash to go with it, though looking at the flash it still looks like glare will be a problem.. may have to look at buying a small(er) umbrella and bounce off of it.