Hi chaps, I'm a little confused here, I was just playing around with live view, to familiarise myself more than anything. I have my AF-ON button set (CFn4 to 3 AE lock/metering/ + af start) which I find pretty useful, I use the back button to focus and, if not in manual, the shutter release for exposure ... when live view is active and I press AF-ON something happens, is it the mirror coming up (live view goes black) or is it a 'bulb' exposure ? LV function is on stills and movie mlu is disabled ... forgive me if this is too basic but I've checked the manual and am struggling ... any help welcome ... regards Roger
5D MkII AF-ON button live view
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Willid1
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If it's the same as the 7D then when you press the AF-on button the camera lifts the mirror to use the normal AF sensor to focus.
If you go into the Live View menu you can change this to contrast detect and the camere will not raise the mirror but will take a while - hunting the lens back and forth - to find focus.
7D also has a Face Detect mode which I haven't tried.
HTH
David
If you go into the Live View menu you can change this to contrast detect and the camere will not raise the mirror but will take a while - hunting the lens back and forth - to find focus.
7D also has a Face Detect mode which I haven't tried.
HTH
David
ChrisJ_SLH
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What Dave said ^
The mirror needs to go back down for phase detect AF sensor. Contrast detect mode uses the imaging sensor (hence the mirror stays up) but it is much slower.
The mirror needs to go back down for phase detect AF sensor. Contrast detect mode uses the imaging sensor (hence the mirror stays up) but it is much slower.
Thank you so much chaps ... really helpful and I'll find some time today to sit quietly and check the settings and read the manual more ! - I'm reasonably good at reading instructions but I must say as comprehensive as the manual is some areas like CF4's AF-ON / shutter butter explanation are a little difficult to understand. So good therefore to get some 'live' assistance. Roger