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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 18 Aug 2012 (Saturday) 17:35
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Question for 1DX & 5D Mk III owners about MFA

 
benttop
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Aug 24, 2012 10:30 |  #16

I haven't felt the need to test or verify the focus accuracy. My keeper rate has gone through the roof with the M3. I now spend my time sorting through hundreds of perfectly focused images looking at composition and color instead of throwing out dozens of OOF shots.


Steve Cavanaugh
EOS 5D MK III, EF 50 f1.2L, EF 85 f1.2L, EF 24 f1.4L, EF 400 f5.6L, EF 24-70, EF 70-200, EF 100-400, EF 100 Macro, G12, EOS 7D, Fujifilm X100S and X-T1

  
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panicatnabisco
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Aug 24, 2012 11:38 |  #17

lazy13bones wrote in post #14897920 (external link)
I needed +4 with 85mm and +10 with 24mm as it comes to MA.
If you have lenses with f/1.4 or f/1.2 it is inevitable IMHO.

x2 with my 50L. All my other lenses are spot on


Canon 1DX | 6Dii | 6D | 16-35/2.8II | 24-70/2.8II | 35/1.4ii | 50/1.8 | 70-200/2.8 IS II | 85/1.4 IS | 100/2.8IS macro | 200mm f/2 | 400/2.8 IS II | 2xIII
Leica M8.2 | Noctilux 50 f/1 | Elmarit 90/2.8
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Invertalon
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Aug 24, 2012 12:03 |  #18

All my lenses on my 5D3 are microadjusted... All require some value of change (even if slightly).

Focus accuracy is excellent though. Shot after shot it just nails it. When I tested my pancake with Focal it was something like 99.8% accuracy. That is damn good for 10 images in a row.


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kfreels
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Aug 24, 2012 12:44 |  #19

Just wanted to add this. MFA has nothing to do with the quality of the AF system. It only adjusts the focus to account for where the sensor lies within the spec range. If your new camera doesn't need MFA while the old one did, it's not the AF performance that changed, but simply the camera being at a better place in the spec range for that particular lens or lenses.


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

  
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Yogi ­ Bear
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Aug 24, 2012 15:28 |  #20

lazy13bones wrote in post #14897920 (external link)
I needed +4 with 85mm and +10 with 24mm as it comes to MA.
If you have lenses with f/1.4 or f/1.2 it is inevitable IMHO.

Thank you, lazy13bones!


Canon EOS 7D | EF-S 17-55mm f/2.8 IS USM | EF-S 55-250mm f/4.0-5.6 IS |
EF 100-400mm f/4.5-5.6L IS USM | 250D | EF-S 10-22 mm f/3.5-4.5 USM | 580 EX II |

  
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Yogi ­ Bear
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Aug 24, 2012 15:35 |  #21

benttop wrote in post #14897982 (external link)
I never could get my 100-400 to the right place on my 5D2 - I had stopped using the lens. And I really spent a lot of effort trying to micro-adjust it on that camera. When I put that lens on my 5D3 it was perfect without any adjust at all. It has become one of my favorite lenses of all time. :)

I find this VERY interesting, Steve! I have had a lot of difficulty getting sharp focus from my 100-400L, first on my XSi, and now on my 7D. I'm glad to hear that the 5D3 solved your problems with this lens! This would seem to support Roger Cicala's suspicion (see article in OP) that Canon has made major changes to the AF system on the 5D3, and not just added more points.


Canon EOS 7D | EF-S 17-55mm f/2.8 IS USM | EF-S 55-250mm f/4.0-5.6 IS |
EF 100-400mm f/4.5-5.6L IS USM | 250D | EF-S 10-22 mm f/3.5-4.5 USM | 580 EX II |

  
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Yogi ­ Bear
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Aug 24, 2012 15:39 |  #22

Invertalon wrote in post #14901315 (external link)
All my lenses on my 5D3 are microadjusted... All require some value of change (even if slightly).

Focus accuracy is excellent though. Shot after shot it just nails it. When I tested my pancake with Focal it was something like 99.8% accuracy. That is damn good for 10 images in a row.

Did you use Focal on your previous camera also?


Canon EOS 7D | EF-S 17-55mm f/2.8 IS USM | EF-S 55-250mm f/4.0-5.6 IS |
EF 100-400mm f/4.5-5.6L IS USM | 250D | EF-S 10-22 mm f/3.5-4.5 USM | 580 EX II |

  
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bobbyz
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Aug 24, 2012 22:02 |  #23

Using 70-200mm f2.8 IS II on my 5dc, 5dmk2 and now on 5dmk3. No adjustment needed. It is plenty sharp. Maybe MA will make a little sharper but so far I see no need for it.


5dmk3, 35L, 85L II, 300mm f2.8 IS I, 400mm f5.6
Fuji XT-1, 14mm f2.8, 23mm f1.4, 35mm f1.4, 56mm f1.2, 90mm f2, 50-140mm f2.8

  
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BTBeilke
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Aug 24, 2012 22:24 |  #24

kfreels wrote in post #14901452 (external link)
Just wanted to add this. MFA has nothing to do with the quality of the AF system. It only adjusts the focus to account for where the sensor lies within the spec range. If your new camera doesn't need MFA while the old one did, it's not the AF performance that changed, but simply the camera being at a better place in the spec range for that particular lens or lenses.

This is exactly what I was going to add. Focus accuracy simply means that the camera will repeatedly focus to the same precise point under a given set of circumstances. A highly accurate focus system does not by itself guarantee sharp pictures. If the calibration between the sensors used for focusing and the sensor used to actually capture a photo is off or individual lenses front or rear focuses, a highly accurate focus system would repeatedly yield out of focus pictures. MFA is used to fix the latter problems. Focus accuracy is a separate issue. The amount of MFA required for any given lens, whether it be -20, 0, or +20) is not an indicator of the accuracy of a focus system.

Think of a highly accurate rifle. With the barrel held in the same position aimed at a wall, repeated shots would create a very tight hole pattern. However, that tight pattern may be above, below, left or right of the target on the wall that you were aiming for. That problem has nothing to do with the accuracy of the rifle but rather it is due to a misalignment of the rifle scope. Sighting in the scope on an highly accurate rifle is similar to using MFA with a lens on a camera with a highly accurate focus system.


Blane
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Question for 1DX & 5D Mk III owners about MFA
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