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If you have the right tools and the skills it can be done. Look at ifixit dot com, because the have video tutorials of how to repair a camera (or laptop or any electronic thing)
But first you have to be sure it is the lens and not just a setting or a switch, broken flat cable or corrosion. My guess is, you can buy a new camera that makes better quality pictures than your SD870, for less then a new lens unit will cost. But I can be wrong??
Try this first, power off and gently push the lens barrel sideways - not back in!, If the barrel and the lens move slightly, you will get it working after some more manipulation in the same way. If it does not budge, sorry to mention this but your camera sustained more damage and you cannot do do much on your own.
turn the 'lock/friction ring' (metal band just below the black rubber focusing ring) counter clockwise whilst holding the focusing 'ring' still. The friction/lock ring is used to prevent 'lens creep' when carrying the camera with lens pointing down, or using the lens when it is pointing down. Juust turn it until it applies the level of friction you prefer for operating the lens. If you have already tried this and it won't budge it may be the bearings are shot and you will need to contact a canon service centre for repair.
Yes, this is normal. Some zoom-lenses adjust the focus when zooming, to always keep the subject in focus. Those tends to be the more expensive lenses.
So you don't have to worry, nothing is wrong with your lens.
hi have you tried removing the battery for couple of hours so it can reset any settings that need to be set back to default it only resets camera memory not settings you have changed but this can sometimes solve the problem your having.
Also when you switch camera on and then press zoom when the camera switches off does the lense go back inside the camera as normal or does it reamin out.
when you switch in on do all the other buttons work like can you take picture and can you access all the menu if you can then take it off auto if its on auto then see if this let you use zoom if not then the chances are their is a fault on the zoom button either jammed could be that the lense motor has come out of line with zoom button, is the display clear when you go to take picture without adjusting the zoom is it still possible to take pictures