SLR lenses on compacts?

just got a copy of "hacking digital cameras" (to bump my amazon order over 15bucks :P) and it says that you can mod EF lenses to fit compacts...

despite reading the book i am not enlightened....even using a lens adaptor on compact of choice (g3 for me), i don't see how'd they optically match up.

I think you can not easily replace the lens of a PS by an EF lens, but a common practice in macro photography is to use an interchangeable lens reversed in front of the camera lens.
There are adapters available to accomplish the task.
I made my own adapter (see below) to use the 50mm lens of my Canon A1 (film SLR) in front of the Pro1 Zoom lens.

Theres a great there in the compact forum by Megaweb on making a super macro set up with a 50mm lens on an A series camera: https://photography-on-the.net/forum/showthre​ad.php?t=50124

Hi Moppie
I seldom visit the Small Compact Digitals forum. I followed the work of kallousa on his Pro1 and he said his work was inspired by megaweb’s work. Following the link you provided, I finally arrived to the megaweb web site. Thank you.

Both megaweb and kallousa shot astonishing macro pictures.