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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 08 Jul 2014 (Tuesday) 00:56
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Keeper rate: Sigma 35 Art vs Canon 24-70ii

 
zarray
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Jul 08, 2014 11:32 as a reply to  @ post 17018820 |  #16

IMAGE: https://farm3.staticflickr.com/2921/14582692796_4874ec019f_o.jpg
IMAGE LINK: https://flic.kr/p/odC7​vS  (external link) IMG_9971 (external link) by JK 91 (external link), on Flickr

IMAGE: https://farm4.staticflickr.com/3913/14602412671_8634724391_o.jpg
IMAGE LINK: https://flic.kr/p/ofnb​xH  (external link) IMG_9969 (external link) by JK 91 (external link), on Flickr

some 100% crops to back up what I was mentioning about.

The second image is still considered "in-focus" but not "perfectly focused" as in the first image.

Not too sure whether I'm being too hard on an F1.4 lens though :(

I'm guessing this is the problem that plagues most 3rd party lenses. I just don't experience this on my canon 50 1.8 and 70-200 2.8

Apologies to the OP if it seemed like I'm barging on your thread.

5D Mark II | 5Dc |17-40 | 24-105 | 70-200 F2.8 IS | Sigma 50mm 1.4 | 580EX

  
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LV ­ Moose
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Jul 08, 2014 11:40 as a reply to  @ zarray's post |  #17

^ Yeah, I get what you're saying. The amount of fringing is a matter of just how in-focus the image is, which may vary between phase-detect and contrast-detect.


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snake0ape
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Jul 09, 2014 11:15 |  #18

I have both. Once both lens have been micro-adjusted for focus, I have no focus issues on my 5Diii. IMO, both lens have high keeper rates and I am quite satisfied with both.


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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mystik610
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Jul 09, 2014 16:24 |  #19

Focus is definitely more consistent on my 24-70II than my 35A….this, however, is more a testament to how good the 24-70 II’s AF system is. The 24-70II utilizes a closed-loop AF system, which when paired with the 5DIII, allows it to focus more accurately.

Also, regardless of what you’re shooting with, your keeper rate will inevitably go down as your DOF gets shallower. i.e., I have a significantly lower keeper rate on my 85L wide open, than my 24-70II. A lot of it is user error, and a lot of it has to do with the inherent weaknesses of a phase detect AF system. Honestly, provided you aren’t shooting moving subjects, the best way to nail shots when working with a shallow DOF is to learn to manual focus!


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Sigma 14-24 f2.8 ART - Zeiss Loxia 21 - Sigma 35 f1.2 ART - Sony 35 1.8 - Sony/Zeiss 55 1.8 - Sony 85GM

  
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accord
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Jul 09, 2014 23:52 |  #20

The 24-70II utilizes a closed-loop AF system, which when paired with the 5DIII, allows it to focus more accurately.

Do you have a reference, for my learning. What other Canon equipments have such capability?




  
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the.forumer
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Jul 12, 2014 21:34 |  #21

accord wrote in post #17022193 (external link)
Do you have a reference, for my learning. What other Canon equipments have such capability?

ditto, would like to know too. I'm using a 6D here, so it probably has what you're making reference to?




  
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mystik610
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Jul 12, 2014 22:10 |  #22

accord wrote in post #17022193 (external link)
Do you have a reference, for my learning. What other Canon equipments have such capability?

Good read on the subject:

http://www.lensrentals​.com …ity-part-3b-canon-cameras (external link)

Looks like it's the newer lenses released after 2012 or so


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strobe ­ monkey
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Jul 14, 2014 01:24 |  #23

mystik610 wrote in post #17027975 (external link)
Good read on the subject:

http://www.lensrentals​.com …ity-part-3b-canon-cameras (external link)

Looks like it's the newer lenses released after 2012 or so

An excellent arti le, I wonder if the 6D also has a newer AF system.


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mystik610
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Jul 14, 2014 06:30 |  #24

strobe monkey wrote in post #17030367 (external link)
An excellent arti le, I wonder if the 6D also has a newer AF system.

Looks like its only the 1DX and the 5DIII (which inherits the 1D's AF system)


focalpointsphoto.com (external link) - flickr (external link) - Instagram (external link)
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Keeper rate: Sigma 35 Art vs Canon 24-70ii
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