Hi Ben,
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Can you please tell me how many shots you can take, roughly, on a full charge?
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Canon claims approx. 190 pics with 25% flash usage and LCD monitor on (and 440 with LCD off!).
I experienced I could fill the entire 512MB CompactFlash card with some 200 pictures before the need to recharge it.
Clearly you could just charge the battery as you like (no memory effect) and keep it always charged. But, since the max number of charge cycles per battery pack is approx. 300 times, to prolong the battery life Canon manual reccomends you to charge the battery only after having discharged it completely. So, I'd rather go out with an half charged battery + spare, use up completely the battery pack and then switch to the other, fully loaded.
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Is it less during your winter?
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As long as I keep the camera in an inner pocket other than for shooting, I haven't noticed any difference. But I haven't used it yet in really cold weather nor below zero (I live in London [img]/ubbthreads/images/graemlins/wink.gif[/img] ).
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Have you experienced any quality concerns with the Sandisk Ultra II?
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Not really, I have been using it for a couple of months with no issues at all, and a very nice reader to PC speed when downloading. I can add that before buying, I called the Canon support center here in the UK and they told me that for the IXUS 500 Canon suggests to use either Canon or Sandisk CompactFlash cards as these are the only ones they certified. He also stated that for this camera they certified up to 512MB, and for this reason dissuaded me from buying a 1GB card (better to have 2 512MB) while the camera should accept these bigger type I cards.
So, which one?
Maybe I am stubborn, but I would acquire again the IXUS 500 as the occasional great picture can be enlarged as much as I want. For this reason, I use 512MB card and I always shoot large, with the resolution of 2,592 x 1,944 pixels, and superfine JPEG, hence approx. 2.5MB per picture.
In addition, if I frame wrongly a picture, I can crop it after and save it somehow still preserving enough resolution.
One comment on the VGA movie clip that the IXUS 500 is supposed to takeup to 30 seconds. If you ever used a real camcorder, you will not like what you see as, while on a static image is good quality, as soon as something moves around, the images are choppy / blurred to say the least (very low frame rate).
Check this review which has also examples and video clips.
Digital Camera Resource
Lastly, consider that with both models you will have to buy a protective case (thanks Canon for not including it [img]/ubbthreads/images/graemlins/frown.gif[/img] )
Hope this help, and take great pictures!