A few camera setting questions

[wjames]

can somebody tell me what the difference between...

on a canon

one shot af
ai focus af
ai servo af


and metering

evaluative
partial
center

im hoping im not wasting any time and hopefully someone can point me to a site to answer this?

thanks

 

[Lufbrarunner]

AF modes

 

[chris321]

One shot - the camera focusses, and stays focussed at that distance/
AI Servo - The camera will continually adjust focus while you half press the shutter (usefull for tracking moving subjects etc)
AI Focus - the camera switches between 1 shot and AI servo depending on what you're pointing the camera at.

Evaluative - breaks the image down into squares, and looks at all of them to get an average exposure
Centre - just looks at the middle bit, ideal if you have a bright subject as a small part of an otherwise dark image (for example)
Partial - not sure, I think it's a mixture, like evaluative, but paying more attention to what's in the middle of the shot.

Hope this helps a little (and I hope I'm right!)

Edit: OR, ignore my drivel and see the link above

 

[wjames]

yeah that helps a lot thank you