My understanding is the OP is talking about the adaptor lenses you can buy for the S5.

http://www.usa.canon.com/consumer/co...&modelid=15207
(scroll to the bottom of that link shows all the accessories available for the S5 including adaptor 'lenses'.)

Since the S5 is a P&S camera, to my knowledge you cannot add a regular SLR/DSLR lens to it with any kind of adaptor.