Canon PowerShot SD1100 IS Digital ELPH Digital Camera?

What exactly is your question? Will they work? Yes they will. Are you asking for more information on them? The 17-85 mm Canon Zoom will work with your 20D ... no problem Here is a link to ...

Like fhotoace, I'm very surprised at the specs on this camera you're looking for. If you manage to find a 35-80 f/1.4 zoom, sign me up, because that will be one incredible lens! Where...

The one that sits in your hands better! As they say - the beauty is in the eye of the beholder.... Same here. These are two great cameras, but one may feel better in your hands, be more intui...

Usually the number in that part of the LCD is the number of shots left on the card. Shoot a bunch of shots and see if the number decreases

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On my SD1000 you get to stitch assist through the menu. To stop it you simply press the "Menu" button. It might be different on your SD790 though.

Since there is on jack for an external mic, you are stuck with the tiny mic in the camera. The only thing left is to control the background noise and hope for the best

Unless your camera is covered by warranty, it is probably going to be too expensive to repair. Most electronic things like TV etc. are are not repaired because it is cheaper to buy a new one. Just...