Been reading the manual on the metering modes and it doesnt come across over clear to me.
in all 4 modes does it take a reading then give it to me to adjust accordingly or does it take a reading itself and apply those settings itself. And what modes does it apply to i usually use M for most things at the moment.
Just feel a bit lost at the moment on what the metering does and if its me that has to adjust or does the camera do that?
The metering mode will give you what it believes is the 'correct' meter reading in the viewfinder - depending on what you've pointed it at.
From that, in M you would centre your meter, in any of the Auto modes, the Camera will centre the meter automatically based on your choices either;
Choosing the 'correct' aperture in TV
Choosing the 'correct' shutter speed in AV
Choosing the 'correct' aperture and shutter speed in P
Of course - all of that depends on the meter getting the 'correct' exposure for the scene. Which is the really important question.
The meter is essentially dumb and guesses that the world is 18% grey.
So if you use CWA it'll take the average of the scene to be 18% grey, it'll be wrong on scenes that are predominantly bright or dark or that include bright spots or really dark areas.
Evaluative metering will take the average of the scene to be 18% grey, it'll be wrong on scenes that are predominantly bright or dark but will be less fooled by the bright spots and really dark areas.
Partial and spot will expect to be pointed at an 18% grey area. If you use them, you need to understand what average looks like and where it's not available how it compares to your metered area. So for instance, spot meter the back of your hand and presuming you're Caucasian that should be about a stop over average.