For those of you with a Canon camera of the above models; there is a firmware release that will make the autofocus work a bit better.
Here are the links (a40,a30,a20,a10)
//www.canon.co.jp/Imaging/PSA40/PSA40_Adjustment-e.html
//www.canon.co.jp/Imaging/PSA30/PSA30_Adjustment-e.html
//www.canon.co.jp/Imaging/PSA20/PSA20_Adjustment-e.html
//www.canon.co.jp/Imaging/PSA10/PSA10_Adjustment-e.html
It mainly fixes the soft-focus problem with the second to last telephoto setting:
In case you haven't seen this problem, take an A40 and zoom to the furthest optical setting (3x). Take a pcture; preferably something a dozen meters away or so. Then just touch the button lightly to zoom back one step (there are 7 zoom settings in total if I recall; maybe only 6); and take the same photo. When you compare these the soft setting of the second photo should be apparent.
The firmware went smoothly for me and is fairly simple to do.
From the great Canon users group: //powershot.inxtec.net/mb/viewtopic.php?t=1460
Hope this helps someone.
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