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DPChallenge Forums >> Tips, Tricks, and Q&A >> Custom Function 4
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Showing posts 1 - 11 of 11, (reverse)
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03/29/2007 02:37:16 PM · #1
article here

I had no idea this function existed. It's an excellent way to switch between one shot focus and servo focus - like say your shooting a bird sitting still and suddenly it takes off and you want to start tracking it in servo mode ... just push and hold one button.

freakin awesome - i can't wait to try it out.
03/29/2007 02:41:11 PM · #2
Hey! Excellent tip Hopper. Thanks for sharing!
03/29/2007 03:16:56 PM · #3
Thank you! Just yesterday I saw this mentioned on someone's portfolio at PBase, though they gave no information on what exactly it did. I've been doing searches for it on and off since with no luck. Thanks again for posting this link. :)
03/29/2007 03:40:31 PM · #4
Huh, that sounds interesting, I was wishing for a way to lock focus quickly without having to reach for the manual/auto switch. Now...which button is this on the 350D?
03/29/2007 04:53:23 PM · #5
the *

Originally posted by gloda:

Huh, that sounds interesting, I was wishing for a way to lock focus quickly without having to reach for the manual/auto switch. Now...which button is this on the 350D?
03/29/2007 04:57:10 PM · #6
Hm... but couldn't you avoid the whole issue by using the * as exposure lock first and then focusing?
03/29/2007 05:03:45 PM · #7
Originally posted by gloda:

Hm... but couldn't you avoid the whole issue by using the * as exposure lock first and then focusing?


...Winner

(at least on the 20D)

Message edited by author 2007-03-29 17:04:17.
03/29/2007 06:24:13 PM · #8
the feature (for me) is for the focus, not the exposure. You set your camera to servo mode, then push the star button to focus on a stationary subject (letting the button go locks the focus) ... when it moves, simply push and hold the star button and your camera automatically is in servo focus, rather than one shot focus

this allows you to lock on say the eye when it's not moving and then recompose the shot without the focus (which is in servo) changing

Originally posted by gloda:

Hm... but couldn't you avoid the whole issue by using the * as exposure lock first and then focusing?
03/29/2007 08:44:57 PM · #9
I take it you're referring to the "AF stop, no AE" function? Using a lens with fulltime manual focus, that function IS invaluable in sports and other action scenarios - however, when i want to catch wildlife shots at their sharpest wide-open, this simply doesn't do the trick. That's because the focusing in AI servo mode isn't as precise as in one-shot - the latter refines the focus to a high degree, especially with lenses below f/2.8 on the 20D and above. The AI servo mode is made primarily for tracking motion however, so the changes it makes are much rougher in exchange for tracking motion the camera would not otherwise be able to catch. You simply don't get the precision of focus with AI servo you would otherwise, and this AF stop button doesn't improve that in any way - if anything, it throws off the accuracy of your focus by freezing a continual autofocus which would otherwise continue DURING your exposure.
03/29/2007 10:08:30 PM · #10
perhaps this is true, i just read about this feature today. I didn't even know it existed. The Nature/Wildlife Photographers over at Fred Miranda seem to love it.

I guess time will tell.

Originally posted by riot:

I take it you're referring to the "AF stop, no AE" function? Using a lens with fulltime manual focus, that function IS invaluable in sports and other action scenarios - however, when i want to catch wildlife shots at their sharpest wide-open, this simply doesn't do the trick. That's because the focusing in AI servo mode isn't as precise as in one-shot - the latter refines the focus to a high degree, especially with lenses below f/2.8 on the 20D and above. The AI servo mode is made primarily for tracking motion however, so the changes it makes are much rougher in exchange for tracking motion the camera would not otherwise be able to catch. You simply don't get the precision of focus with AI servo you would otherwise, and this AF stop button doesn't improve that in any way - if anything, it throws off the accuracy of your focus by freezing a continual autofocus which would otherwise continue DURING your exposure.
03/31/2007 06:10:43 AM · #11
Hm... I guess this would be more useful for me when I use it in One Shot mode. Focusing on an eye, recomposing, taking the shot and keeping the focus locked for the next shot.
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