Here is a link that show all accessories for the A540.
Canon sells the TC-DC52A lens for $130, but if you shop around, you can find them for about $100 (amazon.com)
You need the LA-DC52F adapter to attach the lens to the camera.
($20 - amazon.com)
The lens is rated at 1.75X
which means you multiply your cameras 4X by 1.75X = 7X zoom
Note: That does not mean you can zoom between 4X and 7X.
You have to set the camera zoom to maximum 4X) and the lens converts it to 7X.
I'm thinking of getting the Canon A540 after reading you can get lenses to add to the optical zoom. Can anyone tell me how much the optical zoom can be bumped up to and also how much a lens would cost around? Or if anyone has used an extra lens on their A540 I'm wondering how it is.
I'm also looking at the Kodak Z612 with the 12x op zoom, but it's a little bit on the bulky side.
Thanks for any help!