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How to lock exposure when using back button focus
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Jan 28, 2017 19:24:33   #
murphle Loc: Wisconsin
 
Hi, I've been using BBF on my D750 for a few months now and I've become quite accustomed to it. My question is.... well... trying to figure how to word this because I could be all wrong.

Clearly I can press the AE lock button (BBF) and then recompose and shot. How about metering and recomposing the shot? I mean, I'm using the AE lock button for focus.... how may I lock exposure?

Oh geez!

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Jan 28, 2017 19:45:55   #
oldtigger Loc: Roanoke Virginia-USA
 
trade it in on an 810, they have a separate AF button?
Reassign the preview button?
Use single spot focus/exposure and reassign the location?

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Jan 28, 2017 20:39:35   #
BFS Loc: Queen City, MO
 
Think I missed the question you were asking and would delete if I could find the button to do so.

Sorry!

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Jan 28, 2017 21:43:26   #
murphle Loc: Wisconsin
 
oldtigger wrote:
trade it in on an 810, they have a separate AF button?
Reassign the preview button?
Use single spot focus/exposure and reassign the location?


I suppose I could reassign the preview button

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Jan 28, 2017 22:00:28   #
murphle Loc: Wisconsin
 
Absolutely not trading in my 750

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Jan 29, 2017 02:21:05   #
IBM
 
murphle wrote:
Hi, I've been using BBF on my D750 for a few months now and I've become quite accustomed to it. My question is.... well... trying to figure how to word this because I could be all wrong.

Clearly I can press the AE lock button (BBF) and then recompose and shot. How about metering and recomposing the shot? I mean, I'm using the AE lock button for focus.... how may I lock exposure?

Oh geez!


I may be missing something but l just use bb continues focus , and when I focus it's locked then when I take my finger off l can shoot the rest of the day and not have to refocus again as long as I'm shooting at same location , I can take it off continues focus and put it on lock if I want , but flying birds that is not a good idea , that's like trying to shoot flying birds using the shutter button for focus and shooting to take the pic , with same button , you will miss a pile of shots doing it that way ,

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Jan 29, 2017 02:38:34   #
IBM
 
I would think you would only lock your focus if you were taking photos on a tripod , and shooting a fixed posing chair of the grad class or something to that effect , you do not want to lock your focus up on sports , birds , car racing, or any action shot , I must be taking your question all wrong ???

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Jan 29, 2017 06:25:00   #
murphle Loc: Wisconsin
 
Ok, yeah I think I don't have it worded right. The BBF is activated on my camera using the AF/AE button on the back. That's all good, I have no problems with that. My question is that since I have assigned that button for the focus, how would I do an exposure lock. I believe that oldtigger may have answered my question. I assigned the preview button to AE and if I don't like that I will try the FN button.

The ONLY thing I don't like about BBF is that my hands are small so I sometimes have to hold the camera differently to have my thumb hit that button.

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Jan 29, 2017 07:19:25   #
steveg48
 
Shoot in manual and the exposure will be locked

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Jan 29, 2017 07:20:09   #
PhotosBySteve Loc: Salem, Oregon - USA
 
murphle wrote:
Hi, I've been using BBF on my D750 for a few months now and I've become quite accustomed to it. My question is.... well... trying to figure how to word this because I could be all wrong.

Clearly I can press the AE lock button (BBF) and then recompose and shot. How about metering and recomposing the shot? I mean, I'm using the AE lock button for focus.... how may I lock exposure?

Oh geez!


If you shoot in manual mode, the exposure settings won't change unless you change them.

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Jan 29, 2017 07:34:48   #
murphle Loc: Wisconsin
 
I usually shoot in aperture priority but also use manual..... let me ask this. When utilizing BBF, it removes focus from the shutter button. What then is the shutter button doing if you press it halfway? It's reading light, right?

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Jan 29, 2017 07:42:27   #
steveg48
 
murphle wrote:
I usually shoot in aperture priority but also use manual..... let me ask this. When utilizing BBF, it removes focus from the shutter button. What then is the shutter button doing if you press it halfway? It's reading light, right?

Yes, it is doing the exposure.

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Jan 29, 2017 07:55:48   #
camerapapi Loc: Miami, Fl.
 
This has been discussed here previously and for several times. The rear focus button separates focus from exposure. I do not know about your camera I use a D7000 and the shutter button serves as an AE lock while the rear focus button just focus.
Cannot be any simpler.

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Jan 29, 2017 09:45:22   #
Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)
 
murphle wrote:
Hi, I've been using BBF on my D750 for a few months now and I've become quite accustomed to it. My question is.... well... trying to figure how to word this because I could be all wrong.

Clearly I can press the AE lock button (BBF) and then recompose and shot. How about metering and recomposing the shot? I mean, I'm using the AE lock button for focus.... how may I lock exposure?

Oh geez!


Lots of answers, some humorous, but this is the complete answer, with page references to the manual. There are several ways to do this, and all involve reassigning functions to other buttons.

You can assign exposure lock to the shutter button. Custom Settings C1, Shutter Release Button AE-L - set it to ON to lock focus when you half-press the shutter. This is independent of how you have implemented BBF. (Page 336)

You can also use custom settings F2 to reassign the Fn button with a little more flexibility - you can press and hold to lock focus, press and release to lock focus, you can press to lock focus and exposure, etc. (Page 356) And you can assign the Preview button to do the same thing as the Fn button. (Page 372)

If you are having trouble reaching the AE-AF button on the back with your thumb, consider reassigning AFon to either the Fn button or the Preview button, then using the other front button to do AE lock. These two buttons might be more accessible to a smaller hand than the back button.

And no, you don't need to trade in your D750. At least not until it's replacement becomes available.

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Jan 29, 2017 10:05:15   #
Rab-Eye Loc: Indiana
 
murphle wrote:
Hi, I've been using BBF on my D750 for a few months now and I've become quite accustomed to it. My question is.... well... trying to figure how to word this because I could be all wrong.

Clearly I can press the AE lock button (BBF) and then recompose and shot. How about metering and recomposing the shot? I mean, I'm using the AE lock button for focus.... how may I lock exposure?

Oh geez!


My D300s has one button for a back button focus, and a separate button for auto focus on auto exposure lock. You can choose to lock one or both on the second button. I would think your camera would have the same or similar options, does it not?

By the way, over the past year or so I have become a huge fan of using the back button focus and using the shutter only to take the image.

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