I'm not too sure what the problem you encountered is but I think that you should look at the effect that the ISO setting, aperture size and shutter speed have on exposure. You need to get a good exposure and this is a combination of the ISO setting, aperture size and shutter speed. If you can obtain a good exposure ideally you should probably use a lower ISO setting if at all possible to minimise noise, an aperture size which gives you the depth of field you want and a shutter speed which is fast enough to capture your subject and obtain a blur free image. If your camera is set up so that a good exposure is possible and you the alter one of these three settings (ISO, aperture or shutter speed) you will probably need to alter another setting to maintain a good exposure.
Perhaps it would be a good idea to play with these three settings and note the effect upon the exposure meter when looking through the viewfinder.
If for example you are taking a hand held shot in low light with your ISO set to 100 and your aperture set to f4 you may need a shutter speed of 1/6 second to achieve a good exposure and this may be too slow to obtain a blur free image. Keeping the ISO set to 100 and increasing the aperture to f1.4 might give you an acceptable exposure at 1/13 second. If you increase the ISO to 400 you may find that you'll get a good exposure at f4 with a shutter speed of 1/6 and at f1.4 and 1/50.
If you can study the effect that ISO, aperture and shutter speed have on exposure and if you can appreciate the different effects that all of these settings have I think that you will be more in control and more likely to get a shot that you are happy with.
-------------------- Alan's defence lawyer claimed that "Booze played no part in his typo's."
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