canon 60d

W

Watersedge

Suspended / Banned
Messages
164
Name
Ian
Edit My Images
Yes
what the difference with the buttons AF ON and * on the back of the camera body
 
when i press af on does it lock the focusing. so if i focused on a subject press af on does itlock onto that subject
 
By default, the AF-ON button allows you to set focus before depressing the shutter button. On pressing the AF-On button, the 60D's metering system will come to life, and autofocus will begin. If you release the AF-On button, then the camera will release the metering lock, and will refocus if you subsequently press the Shutter button.

If you keep the AF-On button depressed, though, then the Shutter button will simply initiate the exposure, with focus and metering remaining as set when the AF-On button was pressed.

If you want to able to recompose in AI servo, you have to remove the AF function from the shutter button, whilst taking taking your finger off the AF On when recomposing.

This is under C.Fn.IV on a 60D
 
Set mine up on a 40D to focus when pressing AF-ON then meter via the half press of the shutter button before taking the shot

Seems slightly odd to focus and meter on one point then recompose as the reading will in all probability be quite different
 
tijuana taxi said:
Set mine up on a 40D to focus when pressing AF-ON then meter via the half press of the shutter button before taking the shot

Seems slightly odd to focus and meter on one point then recompose as the reading will in all probability be quite different
Click to expand...

You can AE lock through half depressing the shutter.

In my experience as a wildlife photographer (as with Sports), you don't have the time to change to different AF points, or mess about with spot metering.

The exposure from evaluative metering is generally pretty good. In tricky lighting situations dialing in the required EV saves a lot of time. Though that comes from learning to judge the lighting of a scene/subject, but only takes a few trips in the field.
 
Not so clever with landscapes though when the focus point might give quite a different reading.

AF-ON is good in this situation as it makes using the hyperfocal distance easier without messing about switching the lens AF off. I was trying to point out that it can be set differently and the user needs to pick whatever suits their discipline best
 
tijuana taxi said:
Not so clever with landscapes though when the focus point might give quite a different reading.

AF-ON is good in this situation as it makes using the hyperfocal distance easier without messing about switching the lens AF off. I was trying to point out that it can be set differently and the user needs to pick whatever suits their discipline best
Click to expand...

If you have the time to worry about Hyperfocal distances etc, you are probably going to be exposing manually any landscape.

A landscape on the hoof, simply half depress the shutter or push * for exposure lock based on the point in the frame which you wish to meter from.

When using * to AE lock it does not matter where you focus, as the exposure is locked.

(I use * for my focusing so have to AE lock with the shutter)
 
Last edited:
You must log in or register to reply here.
Back
Top