QUOTE(Andy214 @ Oct 21 2013, 04:36 PM)
If the subject not big enough, the camera may backfocus. Not big enough means, the focus point around same size as the subject, OR it could be you focus on something not enough contrast or which the camera unable to differentiate, it may focus on something else.
Hard to explain, you have to experiment yourself, and see carefully whether it's really focus correctly, you can re-focus to double confirm. For far away, subject, sometimes you can focus on the shirt, rather than the face. Sometimes you focus on the face, the focus went focus on the background.
To better understand your situation, best if you have the sample photo and highlight where is your focus point.
EDIT: If you did focus re-compose, do mention it as well.
If you're using Focus Re-compose in high aperture especially, then it's most likely the problem.
I didn't re-compose, I know re-compose in high apreture will out of focus.
yup the subject is quite small as per ratio to the whole image. Guess thats the limitation. It was a bright background too, guess the camera didn't focus on the face and the face is well lid too..
thanks for the awesome tips!!
QUOTE(amduser @ Oct 21 2013, 10:25 PM)
G lens will always have the widest open aperture when it is mounted, the F number that you see in your LCD is applied when you click the shutter button
so focus at 1.8 and 2.2 makes no different, since you're in event, i assume it is indoor, there are limitation on the lens AF, if not enough light it wont be able to focus well, sometime even in ballroom also will have trouble focusing
and you cant focus and recompose with f1.8, you have to compose then focus and when you focus cannot focus on single color subject, let's say your AF points is at the person's cheek then the lens might have trouble focusing, try focus between eyelid and eye ball, that way you have the color for the lens to focus
it was quite well lid environment because I'm shooting beside the glass panel which has tons of ambient light. Ya, I know with wide aperture can't recompose like that as compared to kit lens.
I guess the contrast is the key to get in focus.. haha will try that on my next event or something..