If he need to be taking photos of tiny pits on gear teeth, then surely he would be better with something designed to do this?
By the time you take a g11 and put an adaptor on (my understanding is the canon one is very plasticy, and you often wind up with vignetting), and a new lens, and possibly ring flash, this is an expensive combo, and we have basically wasted the cost of an adaptor and a lens
WOuldnt something designed to do the macro work properly be better, much cheaper in the long run?
Speaking from experience, the g11 just doesnt get perfect dental shots for me, and i am looking at say 4 or five inches in width, even when i can often have heaps of ambient light
I am not unhappy with my choice, as i knew there would be a compromise, didnt want the bulk of an slr and wanted a rugged camera to take snaps of the kids, 95% was simply good enough for me. (if i was say an orthodontist, and needed perfect pics, then g11 totally unsuitable, and need a proper slr, macro lens, ring flash, etc)
However, if i was to be just using it for work, id splurge the extra dollars and make sure it does the difficult stuff
A real issue with the g11 macro, is, yes, you can go into 1cm, or 5cm, but, unless you have heaps of light, COMING IN FROM EVERYWHERE, then you just dont get something good. If you are doing technical stuff, where is your light coming from? will the camera block it out?
If i was in ops position, id just look in the for sale section for someones old setup who has just splurged on a new purchase and needs to offload their old rig for a good price