Focusing

[indragm]

Nice thread.. I was having similar problem too.

So basically, we choose which focus point that we want to use, focus to the object using that particular focus point, and then re-compose as we need, is that right?

ugh, at work now but can't wait to try this out :P

[indragm]

umm.. helo? anyone?

[missjerrica]

Alright, any explanations on how to change it? lol

I love autofocus because its gets the picture super sharp, but it commonly doesnt get the right focus points, IE the other it was wanting to focus on the little guys green shirt. Although if I make sure the eye is on one of the focus points, then it will mostly select that point. The only way I have figured out how to move the points is by putting it in MF, then I loose the sharpness of the picture.. Im really blinder than a bat, so that probably doesnt help. Oh and then it only gives me one focus point to move around. Is there a setting I need to change in the camera?

[kencaleno]

Focus

Is the measure of the degree of sharpness in our images.
All modern cameras have Auto-focusing, which works very well, but there are times when you need to focus manually. For auto-focus to work properly it requires a certain amount of contrast, if the contrast isn’t adequate you will need to focus manually.[ NOTE: In your camera’s viewfinder, depending on camera-flagship models generally have many focusing spots, and lesser, entry-level dslr’s will have around 5 focusing spots. With lens wide open, any of these spots can be used for selecting where to auto focus-But, depending on maximum aperture of lens in use, the ones you are able to use get fewer. Top-of-the-line cameras will only have the centre spot usable at F8,and entry level cameras at F5.6, and less than that, even these single spots aren’t reliable.]
Actually it is more beneficial to set auto focus by the centre spot, then re-compose, rather than use the peripheral spots-The reason being that only the centre spot has vertical and horizontal pixel rows. This means that if you use the peripheral spots (top and bottom spots have horizontal pixels only and right and left spots have vertical pixels only) To focus, you must have a part of the scene crossing a line of pixels at 90 degrees, and the centre spot gives you a more accurate reading ,having both vertical and horizontal pixels) It will pay you to manually focus most of the time, for full control of the situation. For instance, if an unnoticed reed encroaches into your image, when your are shooting a swan at the lake, for instance, your lens may auto-focus on that reed, rendering your actual subject out of focus.

Regards, Ken