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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 24 Sep 2014 (Wednesday) 23:39
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Canon EF 24-70 II

 
N2bnfunn
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Sep 24, 2014 23:39 |  #1

Hello I have a Canon 24-70 II this past Saturday I did a wedding using it, and I noticed that the auto focus was a little off in low or mid lighting, Anyone else had any trouble with this lens?


Canon EOS R EF 70-200 L 2.8 L 24-70 2.8L II Canon Pixma PRO-1 3 Canon 600EX-RT Speedlites

  
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GeoKras1989
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Sep 25, 2014 09:09 |  #2
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I just started using fast primes in the last year or so. I have: 28 1.8, 35 IS, 50 1.4 and 100 2. I think all of them struggle a bit, wide open, in dim fluorescent light. I usually go to f/4 in low fluorescent. None of these lenses has issues if the temperature is close to 5000K.


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GregDunn
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Sep 25, 2014 09:16 |  #3

Most cameras have a shift in focus point depending on the color temperature of the static lighting; sometimes that can be enough to throw autofocus off at wide apertures. If you shoot wide open, it's definitely worth investigating microadjustment for any fast lens; I have a couple of lenses which would be very iffy without it.


Canon 1Dx | 5D3 | 7D2 | 6D | 70-200L f/2.8IS | 70-200L f/4 | 24-70L f/2.8 | 24-105L f/4IS | 100-400L f/4.5-5.6IS | 17-55 f/2.8IS | 50 f/1.8 | 28-105 f/3.5-4.5 | 4x Godox AD360

  
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GeoKras1989
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Sep 25, 2014 09:20 |  #4
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GregDunn wrote in post #17176832 (external link)
Most cameras have a shift in focus point depending on the color temperature of the static lighting; sometimes that can be enough to throw autofocus off at wide apertures. If you shoot wide open, it's definitely worth investigating microadjustment for any fast lens; I have a couple of lenses which would be very iffy without it.

If I MFA my lenses for use in low 2500K light, won't it mess up my already excellent daylight focusing? Or you just record the value and change MFA settings as appropriate?


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snake0ape
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Sep 25, 2014 10:44 |  #5

I believe that the recent Canon bodies like the 5diii and 1DX has AF hardware and algorithmns that corrects for color temperatures. With my 5diii and 24-70ii, I have no issues with AF in different lighting conditions, except if something is all red and low contrast like a rose.

I had to micro-adjust my lens at the telephoto end with +3 and the wide angle end with -1. The adjustment made a huge difference in terms of sharpness and hit rate.

In very low light, I try to use the center column of focus points so that I can take advantage of the ultra sensitive double cross type focus points.

For me, the 24-70ii is one of my most trusty lens.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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N2bnfunn
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Sep 25, 2014 11:38 |  #6

snake0ape wrote in post #17176965 (external link)
I believe that the recent Canon bodies like the 5diii and 1DX has AF hardware and algorithmns that corrects for color temperatures. With my 5diii and 24-70ii, I have no issues with AF in different lighting conditions, except if something is all red and low contrast like a rose.

I had to micro-adjust my lens at the telephoto end with +3 and the wide angle end with -1. The adjustment made a huge difference in terms of sharpness and hit rate.

In very low light, I try to use the center column of focus points so that I can take advantage of the ultra sensitive double cross type focus points.

For me, the 24-70ii is one of my most trusty lens.

Ok I think you hit it on the head and yes everyone in the wedding had something red in there wear.. I am going to try what you said and thanks again...


Canon EOS R EF 70-200 L 2.8 L 24-70 2.8L II Canon Pixma PRO-1 3 Canon 600EX-RT Speedlites

  
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Canon EF 24-70 II
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