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Thread started 28 Feb 2009 (Saturday) 15:33
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recomposing?

 
habenero
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Feb 28, 2009 15:33 |  #1

Hey all

If I am in M, TV or AV mode on a 50d, how do I focus and lock it then recompose my pic.(Say focus on the eye of a child for portrait then back out a bit) Looking in the manual it explains it but for program or basic modes unless I missed something. I currently use the * for AF when shooting sports. Sorry if it's a really "noobie" question.

Randy


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toxic
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Feb 28, 2009 15:43 |  #2

if using the shutter for AF, have it in one-shot mode, half-press the shutter, hold it, and recompose. If using *, just press it to focus and then release. The focus won't change until you press * again.




  
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shoryuken
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Feb 28, 2009 15:47 |  #3

keep in mind, if you focus on someones eye, and walk back, you will no longer be focused on the eye, but rather in front of the persons eye (or in other words, the focus point has moved back however much of a distance you walked back)


  
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shoryuken
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Feb 28, 2009 15:51 |  #4

also: even if you do not move front/sidesways/backwa​rds, but say focus on someones eye, then tilt your camera to "recompose" your framing/shot, you will no longer be 100% focused on your original focus point. how much the focus is effected depends on your apeture/distance your shooting at.

here is a link that describes it better: http://visual-vacations.com …focus-recompose_sucks.htm (external link)


  
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habenero
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Feb 28, 2009 15:55 as a reply to  @ shoryuken's post |  #5

thanks for the quick replies1 I was thinking about this with a zoom lens as opposed to stepping forward or backward - does it change things?


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shoryuken
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Feb 28, 2009 15:57 |  #6

you mean focusing at a set zoom, and then zooming out and shooting? if thats what you meant, then i believe your focus will be messed up as well.

why would you want to do that anyways?


  
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mrkgoo
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Feb 28, 2009 15:58 |  #7

Also note that, unless you have changed it in the custom functions, your exposure is also locked with half-press of the shutter.

Hang on, you use '*' to focus? Is that in ADDITION to the shutter being AF, or have you separated AF from the shutter? If it is just duplicating the shutter, then I think you have to hold the * while you recompose. If it is separate, then by hitting * and releasing, it is locked.




  
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jra
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Feb 28, 2009 16:15 |  #8

With many zoom lenses, if you change the focal length you'll need to refocus. Only a parfocal lens will do as you describe>>> http://en.wikipedia.or​g/wiki/Parfocal_lens (external link)




  
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jcp2000
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Feb 28, 2009 16:17 |  #9

i have never got a good shot recomposing i say stay away from it idk why so many people do it


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neil_r
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Feb 28, 2009 16:21 |  #10

jcp2000 wrote in post #7426569 (external link)
i have never got a good shot recomposing i say stay away from it idk why so many people do it

Possibly because they do get good shots recomposing


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jcp2000
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Feb 28, 2009 16:24 |  #11

neil_r wrote in post #7426598 (external link)
Possibly because the do get good shots recomposing

do you mean they.... :p


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neil_r
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Feb 28, 2009 16:25 |  #12

jcp2000 wrote in post #7426610 (external link)
do you mean they.... :p

possibly :oops:


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Collin85
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Feb 28, 2009 16:26 |  #13

Unless you're shooting stopped down, you'll often lose pin-point focus accuracy by focus then recomposing. It's generally a bad technique and I'd argue you'd be better off not using it at all. You have a 50D which offers an excellent, intuitive and quick method of switching auto-focus points - via. the joystick you toggle with your thumb.


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Collin85
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Feb 28, 2009 16:28 |  #14

habenero wrote in post #7426352 (external link)
Say focus on the eye of a child for portrait then back out a bit

If by 'back out', you mean 'zoom out', then that's a definite no-no.


Col | Flickr (external link)

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artyman
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Mar 01, 2009 11:50 |  #15

Or just frame it first and manual focus.


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recomposing?
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