back button focussing

nickjohnwatson

nickjohnwatson

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Hiya everyone.

Might seem like a daft question but here goes.

I want to set the 550D to back button focussing, but with that being the exposure lock button will it lock the exposure as well as the focus? I still want the exposure to be independent from it ie swap the buttons? Back button for focussing and shutter button for exposure and shooting.....

Sorry to seem daft but which option do I choose to have what I want :-)

Thanks

Nick
 
nickjohnwatson said:
Hiya everyone.

Might seem like a daft question but here goes.

I want to set the 550D to back button focussing, but with that being the exposure lock button will it lock the exposure as well as the focus? I still want the exposure to be independent from it ie swap the buttons? Back button for focussing and shutter button for exposure and shooting.....

Sorry to seem daft but which option do I choose to have what I want :-)

Thanks

Nick
Click to expand...

Nick, I can't answer for the 550D but I suspect it's the same as all the other Canon bodies I've owned, when you select the function of any button from a custom function, it re-assignes that button so the original default use of that button is altered.
Go ahead and try it, you'll soon find out and you can reset all custom functions easily if you have to.
 
George said:
Nick, I can't answer for the 550D but I suspect it's the same as all the other Canon bodies I've owned, when you select the function of any button from a custom function, it re-assignes that button so the original default use of that button is altered.
Go ahead and try it, you'll soon find out and you can reset all custom functions easily if you have to.
Click to expand...

Cheers, ill give it a whirl. What's the worst that can happen :-D
 
happygolucky said:
When you use BBF half press the shutter to lock exposure.
Click to expand...


I can think of one or two scenarios where this might be usefull.... but most of the time I cant see the point... if the lighting changes between setting exposure and shooting then ooops.. if the lightings constant then no point using it and may as well expose on click.
 
happygolucky said:
It's a way of taking a metering when required.
Click to expand...

We know :)

What I am saying is.. wouldnt you normally want to take the metering at time of taking the picture...I can imagine times when you would want it different.. but setting your camera so its always at a different time ?
 
KIPAX said:
I can think of one or two scenarios where this might be usefull.... but most of the time I cant see the point... if the lighting changes between setting exposure and shooting then ooops.. if the lightings constant then no point using it and may as well expose on click.
Click to expand...
If the lighting is constant, then it gives you the opportunity to remain in an auto-mode and spot-meter on something that isn't centre of frame after recomposing (was that one of the scenarios that you thought of?).
 
weybourne said:
If the lighting is constant, then it gives you the opportunity to remain in an auto-mode and spot-meter on something that isn't centre of frame after recomposing (was that one of the scenarios that you thought of?).
Click to expand...

I'll wager it was more likely a football player on a bright sunny day moving swiftly up the pitch and running through shadows caused by the stand into the bright sunlight before scoring the all important goal :)
 
ha! different strokes for different folks of course.. i just presumed mostly the exposure at time of shooting is best.. know theres other scenarios but commenting on what would be default usage..
 
ps if the lighting is constant and you know enough to use bbf would you really be metering..wouldnt you be in manual and doing it all yourself? :)
 
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