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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 26 Jul 2012 (Thursday) 23:26
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50D Focus lock...how?

 
mariettaphotog
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Jul 26, 2012 23:26 |  #1

Hey guys...Shooting some sports and some weddings and was just wondering how I could achieve focus lock on the 50D? I want to be in AI Servo so I can focus on moving objects, but there are times where people are standing still and I dont want the focus jumping around on me. I want to just set middle focus on camera,focus on the eyes with middle focus point, have it lock, then reframe the image and shoot. This should keep the focus where I locked it no matter where I frame the shot so the eyes will be in focus.

My problem is, I know it can be done, but I dont know how. Anyone know how that would be willing to help?


Allen
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(Yes, I KNOW...TWO of my lenses SUCK!)

  
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HyperCams
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Jul 26, 2012 23:40 |  #2

Are you using back button focusing?
If so, do you have the shutter button set to "AF Start/Meter Start"?(not sure which Custom Function this would fall under for your 50D..)
If you set it so that your rear button is for AF start, and the shutter button is ONLY for AE lock/Meter start, you can focus and recompose as wanted.

Focus with thumb, shutter with index finger..

When set to AI Servo, you simply PRESS and RELEASE the AF button for "one shot" focus, or you HOLD DOWN the AF button for Servo focus/tracking..
I just learned this trick from someone here a couple weeks ago, and this is sooo much fun. no more having to switch between AI and One Shot, just PUSH or HOLD the AF button for whichever "mode" you want..brilliant.

FWIW I have my 5D2 and 60D setup to only Meter Start/AE lock(?) on the shutter button. and the AF is set to "AF Start"..
Not sure if there is a better way to set it up or not..I am sure there is..but this works wonderfully for me

Hope this helps :)


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ashiundar
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Jul 26, 2012 23:50 |  #3

You can turn off autofocus on the lens and lock it that way as well.


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mariettaphotog
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Jul 27, 2012 00:09 |  #4

HyperCams wrote in post #14775977 (external link)
When set to AI Servo, you simply PRESS and RELEASE the AF button for "one shot" focus, or you HOLD DOWN the AF button for Servo focus/tracking..

Hope this helps :)

Awesome, Ill try that! Thanks!


Allen
Canon 50D - Gripped
Canon 55-250mm f/3.5-5.6, 18-55 EF-s, 75-300 EF III
(Yes, I KNOW...TWO of my lenses SUCK!)

  
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chrismarriott66
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Jul 27, 2012 03:20 |  #5

If you're not using back button focusing then you'll have to switch quickly form AI-SERVO to ONE-SHOT... it shouldn't take *that* long to do, but depends on what you're shooting I guess...

If there's lots of variables that mean you can't quickly change the focus mode then it sounds like back button focusing will become your best friend!


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Shooting
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Dec 12, 2013 11:26 |  #6

But doesn't using AI Servo disable the AF assist beam if you are using flash?




  
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apersson850
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Dec 12, 2013 11:29 as a reply to  @ Shooting's post |  #7

Yes it does. Then whether that's a problem or not depends on the conditions.


Anders

  
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Shooting
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Dec 12, 2013 19:23 |  #8

apersson850 wrote in post #16521847 (external link)
Yes it does. Then whether that's a problem or not depends on the conditions.

I like every advantage I can get at my finger tips.




  
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50D Focus lock...how?
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