Efraim Nussbaum at Adorama was kind enough to let me check af performance on a few 3rd party alpha mount lenses
Update: part 2, a few more Zeiss lenses with SSM tested here
the first lens I tested was the Sigma ART 50mm 1.4,
unfortunately it can’t lock focus, it behaves like it would with the LA EA3 on an older generation A7(r,s,II) body. No problem with the LA EA4.
The Sigma ART 35mm 1.4 on the other hand works like a charm with the LA EA3, af performance is incredibly fast and without hesitation.
The first generation Sigma 50mm 1.4 DG works also like a charm, glad I kept mine around, a lovely lens for portraits, great center sharpness (only one stop behind the ART according to photozone.de) and bokeh characteristics, nails focus every time and you can find amazing deals on Ebay.
The Sigma ART 24 105mm f4 auto focuses fast and accurately with the LA EA3.
The Sigma 85mm 1.4 DG focuses fast and accurately, however, it does it in micro steps.
The Tamron SP 150-600mm f5-6.3 focuses quickly, not sure how well tracks, this is where the fine tuning option for tracking speed comes in.
I tested the lenses in the store, basic neon lighting, some areas dimly lit and I didn’t have problems nailing focus with most lenses (stationary subjects), except for the Tamron at 600mm handheld in crop mode, focusing onto the darkest corners was a painful experience.
The fastest focusing lens was the Sigma ART 35mm 1.4, a wonderful lens, bokeh characteristics are very nice and it balances well on the A7rii with a battery grip attached.
Second in line was the Sigma 50mm 1.4 DG, known for fast af performance since its introduction, however, I couldn’t get my Canon version to nail focus reliably, a known issue with this lens in Canon and Nikon mount. I didn’t have these problems when using it on the LA EA4, although it back focused and needed -5 adjustment, with the LA EA3, it nails focus every time, love using this lens now.
A quick reminder, the purpose of this test was to see which lenses work properly in auto focus mode on the A7rii and the LA EA3. Since there is the option to adjust tracking speed, you will have to do some work to get the most out of it, I did it on my Nikon D800E and it was totally worth it, you will get many more keepers if you take the time and test and adjust according to your subjects.
There seems to be some confusion about the adapters, particularly when it comes to vintage lenses and the older screw driver Zeiss/Minolta lenses, like the 135mm 1.8 and the 85mm 1.4.
All my screw driver lenses work like a charm on the A7rii with the LA EA4. Usually the same front or back focus adjustments need to be dialed in as on previous generation bodies, however, image stabilization works on all of them in auto stabilization mode.
here is the list of lenses I am using with the LA EA4 and getting IBIS:
Zeiss 135mm f1.8 (good deals on Ebay)
Minolta 100-200mm f4.5 (crazy cheap, Ebay)
Minolta 50mm 1.7 (only sharp in the center, very cheap on Ebay)
Tamron 35mm-135mm f3.5 4.5 (amazingly sharp lens, hard to find on Ebay)
As long as the lens communicates with the body, we have IBIS working, now that
certainly gives those old lenses new life!
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