QUOTE(albnok @ Nov 13 2007, 02:22 AM)
clivengu: This is because the A100 will choose underexpose in a high-contrast situation. Note that the Canon 400D is also prone to this.
For example, if you're shooting your room and the lights are off, but the computer screen is on, the A100 will choose to darken the image so you can see what's on the screen, instead of brightening the rest of the room and making the screen white.
When the camera underexposes, more of the picture is in shadow... and noise appears in shadows!
You will notice that if you shoot ISO1600 in daylight, it is hardly noisy. Thus, it is because it is underexposed that it looks noisy.
Therefore, you should set your AEL button to "Spot AEL Toggle" and press it while pointing at a dark area. The shutter speed will become a lot slower but the shadows will be exposed so you can see them.
So why does the A100 underexpose?
1) You get a faster shutter speed instead of a slower one. Why not? Less shake!
2) If you overexpose whites, it will be all whites and you cannot darken it to get detail. If it's underexposed you can brighten it still.
On the A700 they have fixed the noise levels and metering. Now, I dare use up to ISO3200! ISO6400 is for the extreme situations.
Thanks albnok for d tips.. i understand these situation where noise are inevitable especially when shooting in low light... especially when on hand. so i think the max iso i will use is up to 400 only... 800 are quite noisy oredi.. but IS STILL MUCH BETTER THAN my digicam canon A80 at ISO 100 above. hahaha..
i'll like to share some photos i test out.. but i cant find a way to upload photos here..
another question.. yesterday i play with shuttle speed.. i put on tripod.. let the shuttle open for bout 10-15 second to capture the view outdoors from my condo room. my question is ..will d camera spoil easier if we keep using the camera for long shuttle like this. (thers a soft "Yiiiii" sound when it was capturing and takes hell long to process d image. I found that my old A80 r having all kind of weird problems after I try to play with long shuttle speed.
Another question!!!! patient patient

if under low light condition..(yesterday was playing with low light) the autofocus cant work.. it cant focus... what is the best way to focus our image other than using manual focus?