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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% ??

 
KirkS518
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Jul 11, 2012 13:35 as a reply to  @ post 14702550 |  #31

I trust no one.

But I use AF 80% of the time, because my eyes are inversely getting younger.


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hairy_moth
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Jul 11, 2012 13:52 |  #32

There is no "always" -- or at least there should not be for any serious photographer.

I use AF most of the time, it let's me down some of the time.
I use manual focus for:


  1. macro
  2. low light
  3. tricky situations


One of the features I have been using more often recently is live view on a tripod for a motionless subject. I use the LCD to frame my shot, then go to 10x magnification to manually focus with incredible results.

7D | 300D | G1X | Tokina 11-16mm f/2.8 | EF-S 17-55mm f/2.8 | EF-S 60mm f/2.8 Macro | EF 85mm f/1.8 | 70-200 f/2.8L MkII -- flickr (external link)

  
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chantu
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Jul 11, 2012 14:30 |  #33

Trust but verify ...
- outside with good light - very near 100% and exactly 100% for sports (no choice)
- inside - shoot but "chimp", if focus is off, repeat
- macro - maybe 50%. Best focus is achieved with live view with 5x mag.


Canon 5D mk3, 7D mk2, 7D, 17-40L, Canon 85mm f1.8, Canon 70-200mm IS, Canon 17-55mm, Sigma 17-50 OS, Sigma 10-20mm, Tamron 24-70VC 580ex flash (x3), 550ex, Yonguo 622C triggers, Fuji XE-1, 18-55mm Flickr (external link)Feedbacks of Items Sold/Bought *

  
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ceremus
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Jul 11, 2012 15:31 |  #34

The one time I would really be comfortable using manual focus is with the Magic Lantern firmware loaded, and using the LCD with focus peaking (external link)enabled.

That's only good for my T3i though, no dice on my 7D.


My flickriver (external link)

  
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charro ­ callado
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Jul 11, 2012 15:37 |  #35

no.




  
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h4ppydaze
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Jul 11, 2012 15:45 |  #36

100%? No. There are times I can do it faster or better myself. But a vast majority of the time I'm using AF




  
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runninmann
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Jul 11, 2012 15:51 |  #37

I don't trust it 100%, but I use it 100%.


My Gear

  
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Colorblinded
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Jul 11, 2012 18:58 |  #38

chantu wrote in post #14702846 (external link)
Trust but verify ...

Funny, I almost said the same thing in my reply.


http://www.colorblinde​dphoto.com (external link)
http://www.thecolorbli​ndphotographer.com (external link)

  
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kfreels
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Jul 11, 2012 20:31 as a reply to  @ post 14700607 |  #39

I trust it better than I trust my own manual focus speed and accuracy. The focus screens on these AF cameras aren't designed to make it easy. If we had split microprisms back I would feel more confident with MF but then again, that causes problems seeing your subject as well. Tradeoffs - always tradeoffs.


I am serious....and don't call me Shirley.
Canon 7D and a bunch of other stuff

  
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Tsmith
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Jul 11, 2012 20:59 |  #40

More so with the 7D than any previous APS-C bodies I've owned.




  
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Rayman7
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Jul 11, 2012 21:19 |  #41

In my understanding: The autofocus system relies on the sensor information you give it and puts its through some form of algorithm to determine if the subject is in focus.

I've often wondered maybe there are some tips as to what information is best to give the AF point i.e. are we best to choose a particular colour to focus on? What about picking something with a line on it, or a pattern?

Obviously this isn't ideal in all situations but would be good to know if something like this helps.




  
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Wilt
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Jul 11, 2012 21:53 |  #42

99.95% because if I trusted it less, the poor precision of the standard focusing screen in the dSLR is so poor as to be almost useless, and the aftermarket focusing screens screw up metering accuracy on the Spot mode which I trust (because Evaluative I do not trust!)


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Keyan
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Jul 11, 2012 22:17 |  #43

Not 100%... There is a reason that only the expensive lenses have full time manual.


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kfreels
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Jul 11, 2012 22:28 |  #44

Rayman7 wrote in post #14704457 (external link)
In my understanding: The autofocus system relies on the sensor information you give it and puts its through some form of algorithm to determine if the subject is in focus.

I've often wondered maybe there are some tips as to what information is best to give the AF point i.e. are we best to choose a particular colour to focus on? What about picking something with a line on it, or a pattern?

Obviously this isn't ideal in all situations but would be good to know if something like this helps.

http://www.cambridgein​colour.com …ials/camera-autofocus.htm (external link)


I am serious....and don't call me Shirley.
Canon 7D and a bunch of other stuff

  
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Nature ­ Nut
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Jul 11, 2012 22:33 |  #45

I trust my AF more than I trust my doctor. Because if it's wrong I probably won't die. That said, I wouldn't trust my doctor or my AF in a dimly lit room.


Adam - Upstate NY:

  
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do you trust autofocus 100% ??
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