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I like to set my ISO rating to the lowest rating for the condition. If it's a sunny day, I usually use 100 or less. For dimmer conditions, or for sports photography, I'll use 200 or more.
I have a Canon Powershot G6. It has an amazing low ISO rating of 50 which is amazing. Low ISO means photos will be less grainy for these point and shoot cameras. I also set my apeture to a large f2.0 to compensate for the low ISO. Also, the lense for the camera is amazing for the G6 - photo quality are comparable to Canon Rebels SLRs.
I don't know why people buy the G9. Image quality isn't amazing, so-so lenses, poor battery life, it's just the same camera as the Canon A650 IS except you get the control the shutter speed and apeture. G9 as for all the Canon G series makes a good back up camera for your SLR. but don't rely it as your only camera.
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