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Back Button Focus A77

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allan arthur View Drop Down
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Post Options Post Options   Quote allan arthur Quote  Post ReplyReply Direct Link To This Post Topic: Back Button Focus A77
    Posted: 30 December 2013 at 20:54
Hi,
I have heard about this proceedure so I thought that I would give it a try. It seemed to be directed mainly at Cannon users but I was led to believe most DSLRs can do it.

I deactivated the shutter focus, put it on continuous focus mode, eye start activated and programmed my AF and MF button to programe lock.
I then used the middle sensor say on the eye of the person, pressed the AF MF button to lock focus, then recomposed the shot and pressed the shutter, this gives the advantage of the scene being metered at the point of pressing the shutter. Whilst keeping the AF MF button pressed the focus stays locked.
This gives you the advantage of not having to re-focus after every shot, also if the subject moves you can release the AF MF button and go into immediate continuous focus via eye start.

The trouble with this is you have to keep your finger on the AF MF button all the time to keep focus locked. If you do not have eye start activated then you have to press the shutter half way down to activate Continuous focus.

I am led to believe on Cannons the programmed AF button works differently,
you press it and release it and then it locks focus, when you press and hold it, it starts continuous focus, this seems a lot more practical.

Has anyone tried it on the A77 and if so what do you think, have I set it up right?
all the best,
Allan
 



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mpfield View Drop Down
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Post Options Post Options   Quote mpfield Quote  Post ReplyReply Direct Link To This Post Posted: 31 December 2013 at 04:19
I have it the same, except with eye-start AF off. My AF/MF button is set to AF lock. If the subject moves I just have to press the AF/MF button again to obtain lock. This way is the opposite of what you have now; pressing the button starts focus, and releasing the button stops it.
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allan arthur View Drop Down
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Post Options Post Options   Quote allan arthur Quote  Post ReplyReply Direct Link To This Post Posted: 31 December 2013 at 15:05
Hi thanks for getting back to me.
I have set it up without eye start on, as you suggested, in Continuous Focus Mode and the same settings mentioned in my initial post.

I can confirm that when I press the back button in it focus locks, I am using the cetre focus point, this then locks that focus on that focus point, I then release the button and it stays locked. I then press the button in again to re-lock focus, because say something has moved.

The point is that I dont seem to have Continuous Focus though. As soon as you press the button in, it immediately locks focus. I was hoping that if you move the focus point with the button still pressed in you would have Continuous Focus, until you release the button. It seems on the Canons, if I have this right, you press the back button, held in, this gives you continuous focus until you release, then it focus locks.

This obviously gives you the advantage that if you have locked focus on a child's face with the back button and released, and then say the child moves towards you, you can then press the back button, go into Continuous Focus mode, when you have focus just release and shoot.
Is this possible on the A77?
Regards,
ALLAN
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