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Assigning focus on a77ii

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Dena View Drop Down
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Post Options Post Options   Quote Dena Quote  Post ReplyReply Direct Link To This Post Topic: Assigning focus on a77ii
    Posted: 11 October 2017 at 03:48
Anyone assign focus from the shutter button to another? Lots of people I know use 'back button focus' and find it easier.
 



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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 06:31
Nope, but why do you ask?
I don't see the need. I can't see the advantage of back button focusing in most situations to be honest. While I'm sure there are some advantages, I think "lots of people" just use the back button focus because "lots of people" use it - not because it is better. Just IMO.
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Dena View Drop Down
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Post Options Post Options   Quote Dena Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 07:16
I've never used it, but know several who say they could not live without it. Wondered if anyone uses it here.
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Post Options Post Options   Quote AutumnRose Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 15:59
I use it on my camera that I use for sports and wildlife photos. I use it in continuous AF so that it keeps focusing while I'm holding it in, that way you don't have to acquire focus again after a shot like you do when focus is assigned to the shutter button. I don't have my other cameras set up that way though. There isn't an advantage that I can see for still subjects, besides remembering how you have that camera set up (and I have no problem with that). I guess one other advantage would be that it eliminates accidental shots from a sensitive shutter button. It's easy enough to set up and try it out to see how you like it.
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Post Options Post Options   Quote punkskaphil Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 16:20
I use it for bird photography. I only started using back button focus about a year go, but I do prefer it. The only issue I have is that because I'd gone so many years without it, if I haven't picked the camera up for a week or two I sometimes initially forget that I've assigned it to the back button now.
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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 18:08
Originally posted by AutumnRose AutumnRose wrote:

I use it on my camera that I use for sports and wildlife photos.

Originally posted by punkskaphil punkskaphil wrote:

I use it for bird photography.

Like I said: I'm sure there are some advantages - these are very specific situations.
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Post Options Post Options   Quote Roger Rex Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 00:37
Originally posted by addy landzaat addy landzaat wrote:

I can't see the advantage of back button focusing in most situations to be honest. While I'm sure there are some advantages, I think "lots of people" just use the back button focus because "lots of people" use it - not because it is better. Just IMO.


As a landscaper I use "back button focus" on 100% of my tripod mounted shots. A very common landscape process is to use spot focus, place the spot on the subject you want in sharp focus (frequently a foreground element), use back button focus, then re-compose while focus remains locked on the desired subject. This focus, lock focus, re-compose while on a tripod is routine among landscapers and using back button focus lets you keep your hands free of the camera while using a remote shutter release is a common landscape protocol.
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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 06:39
Why don't you use the appropriate focus point? Using the focus and re-compose method is sub-optimal. Or use manual focus.....

Edited by addy landzaat - 08 November 2017 at 06:42
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Post Options Post Options   Quote ABDurbs Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 06:47
Originally posted by addy landzaat addy landzaat wrote:

Why don't you use the appropriate focus point? Using the focus and re-compose method is sub-optimal. Or use manual focus.....

Have to agree with this. I very seldom recompose and mostly use the focus points. That's what they are there for. I also use manual focus whenever possible. I used to have back focus assigned but found I used it so seldom I stopped using it at all. I think once you get into the habit of using it, it can be very useful.

Edited by ABDurbs - 08 November 2017 at 06:50
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Post Options Post Options   Quote Roger Rex Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 09:45
Originally posted by addy landzaat addy landzaat wrote:

Why don't you use the appropriate focus point? Using the focus and re-compose method is sub-optimal. Or use manual focus.....


Use of center spot and recompose - quicker, easier. Manual vs AF - eyesight issue and AF is quicker (locks on immediately in landscape, good light situations).
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 09:55
Think I use a "variant" of it most of the time, rather than do full on BBF I usually shoot in AF-C with the AF/MF button on my A77 set to "focus toggle". That way I can use whatever focus point I want and to half press on the shutter button to focus and with a single push of the AF/MF button turn the whole thing into MF.
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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 13:51
You use "back button focus" on 100% of your tripod mounted shots, you use center spot and recompose because it is quicker, easier. But what is quick and easy about using a tripod? Using the appropriate focus point is easier then setting up your tripod I guess..... I mean, if you're happy with it, by all means. But I am surprised, that's it.
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Post Options Post Options   Quote mikey2000 Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 13:55
I do exactly what SnowFella does.

One other thing I like is to separate AEL from the half press. That way, when/if I recompose, the auto exposure is correct for the final compo, not just the composition I had when I focus-locked.
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Post Options Post Options   Quote Roger Rex Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 15:17
Originally posted by addy landzaat addy landzaat wrote:

You use "back button focus" on 100% of your tripod mounted shots, you use center spot and recompose because it is quicker, easier. But what is quick and easy about using a tripod? Using the appropriate focus point is easier then setting up your tripod I guess..... I mean, if you're happy with it, by all means. But I am surprised, that's it.


Tripod use - to insure sharpest, best image quality possible. I'm more than willing to take the time to yield the best possible results rather than be "quick and easy". I have been personally exposed, pun intended, to the teachings of about nine pros (that's how many I can specifically remember, memory not the best these days) over 12 years of shooting and every one of them personally used and strongly recommended the use of a tripod for landscape shooting. So, yes, speed and convenience is not the be-all-end-all but using back button focus, for me in my landscape shooting circumstances, is faster AND better. The two issues - how to focus and use of a tripod are somewhat unrelated. In both cases, of course, there are pros and cons, advantages and disadvantages and each person selects an approach that works best for them.
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