ExodistPhotography
Photographer, Artist & Youtuber
ahsanford said:ExodistPhotography said:So what if the lens focuses perfectly each time, but it just happens to be back focusing. Or front focusing each time consistently. This is what micro adjustments fix. Micro adjustments are not to fix bad focusing lenses, but to fine tune them to your particular camera. If you want to avoid this, I suggest you never use a fast aperture. Just saying.. :-/
Yes, but Sigma has a history of inconsistently focusing lenses that you can't solve with AFMA / their USB dock.
I always use the TDP example to show this with the 50 Art:
http://www.the-digital-picture.com/Reviews/Sigma-50mm-f-1.4-DG-HSM-Art-Lens.aspx
(pan halfway down until you see the butterfly -- read and mouseover the digits)
And CR's reviewer Dustin Abbott presented a basic head to head hit rate effort while shooting both the 35L II and the 35 Art wide open, and the results were telling:
http://dustinabbott.net/2016/01/sigma-35mm-f1-4-dg-hsm-art-review/
(1/3 of the way down with the school pictures: 92% for the 35L II and 64% for the Sigma)
And it wasn't like the Servo AF incorrectly selected the AF points. Again, from Dustin's review:
"Reviewing the data in Lightroom via a plugin called “Show Focus Points” tells me that I was using AF Servo focus and that focus was locked with the center point square in the middle boy’s face…and yet the lens is actually focused on the far wall. By contrast the Canon 35L II shots in the same situation were all accurately focused."
I don't say this to smear/troll/mock/doubt Sigma -- I say this to spur them on to fix their designs and fulfill the promise of their fine optics.
- A
Well thats not what he was posting about. His statement is that he didnt want to worry with Micro Adjusting lenses. Which is an issues with no matter what brand you use. Canon, Nikon, Sigma, Tamron, etc.. His statement and mine was not if the 85mm would focus correctly each time.. Heck my 50mm STM needs micro adjusting right now.. Just saying..
That said, I do agree that we need a lens that is accurate each time without having to default to Live View to get accurate focusing.
On a side note, I personally would not put to much stock into Dustins reviews. They are flawed by design. In that I mean he test one copy, not a dozen copies and then makes a average of their performance. So he can get a bad copy of one lens, or he can get a fantastic copy thats better then most that hit the shelf. Of course this is a complaint I have with a lot of lens reviewers including DXO's half baked results. So, take it all with a grain of salt. But if everyone says the same thing that its inconsistent, then yea run from it.. LOL :-D
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