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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 11 Jul 2012 (Wednesday) 00:04
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do you trust autofocus 100% ??

 
cdang
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Jul 11, 2012 03:56 |  #16

With the 85L, not really. But thats probably more user error unless I use live view but then thats not AF.




  
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frontier2005
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Jul 11, 2012 06:32 |  #17

i wear eyeglasses, manual focus it's really hard for me. i see it clear in viewfinder but, on LCD its blurry.


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lilkngster
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Jul 11, 2012 08:51 |  #18

Depends on which lens I am using and its inherent "issues" with focusing, how much I am pushing the autofocus system on 5d and t2i, and what my accepted tolerance for "misfocusing" is (short distance f/2.8, group portrait f/4, landscape f/8).

frontier2005, maybe you need to adjust your diopter (the little dial next to the viewfinder). I am legallly blind without my glasses but am able to manually focus fine via the viewfinder, but it did take some adjustment.


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Ralph ­ III
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Jul 11, 2012 09:22 |  #19

I shoot autofocus 99% of the time. This would include shooting tennis events and family, etc.

I do resort to manual focus on some rare or difficult occassions.

It's difficult to tell if I'm spot on with manual focus whereas I rarely get any OOF shots using AF and the center point.


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Jul 11, 2012 09:32 |  #20

AF 99% of time. For walk-around and people, I use back button focus for better control in re-composing the shot.


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Beachcomber ­ Joe
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Jul 11, 2012 09:43 as a reply to  @ post 14700607 |  #21

The viewfinders provided as standard equipment on DSLRs do not lend themselves to critical focus. Additionally, many lenses made today have manual focus controls that are way to coarse for precise focusing. So yes, I use AF 99% of the time. If I am shooting in very low light and the camera is mounted on a tripod I will ocasionally use live view expanded to 10X.




  
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ceremus
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Jul 11, 2012 09:58 |  #22

Beachcomber Joe wrote in post #14701592 (external link)
The viewfinders provided as standard equipment on DSLRs do not lend themselves to critical focus. Additionally, many lenses made today have manual focus controls that are way to coarse for precise focusing. So yes, I use AF 99% of the time. If I am shooting in very low light and the camera is mounted on a tripod I will ocasionally use live view expanded to 10X.

Yup, pretty much this. Manual focus SLRs and MF rangefinders were optimized for focusing manually, and DSLRs just aren't. Unless you're using the LCD w/ magnification, or you actually installed one of those split prism focus screens (if it's even possible to do so on your model), you're probably going to miss critical focus by going manual instead of AF.


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ZoneV
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Jul 11, 2012 12:29 |  #23

ceremus wrote in post #14701662 (external link)
Y... Manual focus SLRs and MF rangefinders were optimized for focusing manually, and DSLRs just aren't. Unless you're using the LCD w/ magnification, or you actually installed one of those split prism focus screens (if it's even possible to do so on your model), you're probably going to miss critical focus by going manual instead of AF.

This is the reason for me to use the EE-S screen and a split screen on my 5D`s.
The EE-S ist good for Minolta Rokkor 58/1.2, Canon FD 85/1.2 and Zeiss 35/1.4 and others.


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arkphotos
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Jul 11, 2012 12:49 |  #24

100%
I tried manual focus, and miss alot more than the af does (assuming there is some contrast to grab).
My biggest problem with mf - i dont have the lenses (or viewfinder) that makes it workable. even if the viewfinder did, the focus 'throw' on all my lenses is too fast manipulate reliably.


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Numenorean
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Jul 11, 2012 12:53 |  #25

It seems to work fine for me. I'd say that these days if you DON'T use AF you will be missing moments.

But rather, if you don't use your AF correctly.


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BaghdadFred
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Jul 11, 2012 13:02 |  #26

Well I can tell you that I am much less prone to focus problems when I have my F/stop bumped up to F/5.6 or higher. That's not always possible when shooting indoors.

If I am feeling lazy I don't take the time to set up extra external flashes throughout the room to brighten things up.


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Numenorean
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Jul 11, 2012 13:04 |  #27

BaghdadFred wrote in post #14702484 (external link)
Well I can tell you that I am much less prone to focus problems when I have my F/stop bumped up to F/5.6 or higher. That's not always possible when shooting indoors.

If I am feeling lazy I don't take the time to set up extra external flashes throughout the room to brighten things up.

That would just be hiding focus problems by utilizing a bigger DOF.


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jlbrach
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Jul 11, 2012 13:04 |  #28

i trust autofocus like i trust power steering lol


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dmnelson
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Jul 11, 2012 13:17 |  #29

I use AF the vast majority of the time. I feel like it's plenty accurate. There are times I will switch to MF but that's usually just if I'm having trouble getting the camera to select the correct thing to focus on. But even then that is usually solved by switching to a single AF point.

The place I use manual most is in macros, because that's where the camera has the hardest time getting it right.


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Colorblinded
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Jul 11, 2012 13:18 |  #30

ceremus wrote in post #14701662 (external link)
Yup, pretty much this. Manual focus SLRs and MF rangefinders were optimized for focusing manually, and DSLRs just aren't. Unless you're using the LCD w/ magnification, or you actually installed one of those split prism focus screens (if it's even possible to do so on your model), you're probably going to miss critical focus by going manual instead of AF.

Pretty much, manual focusing with DSLRs can be quite the pain. Not impossible but many of the focusing screens usually just aren't really very good for it. I have a split image screen for my EOS 3 that I used a fair bit but I only ever put it in my 1D Mark II once to amuse myself, I haven't really found myself using it much. I do have a couple manual focus only lenses but as long as I don't mount them to my XTi I can manually focus them fine on my 1D2.

The focusing screen on the Rebel actually effectively increases DOF and makes it harder to tell when focus snaps in to place. Most modern DSLRs share the lack of "snap" due to the screen design but at least on the "higher end" cameras you can tell, it's just more subtle.


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