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Focus area of LA-EA4 with SSM lenses

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tantran88vn View Drop Down
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Post Options Post Options   Quote tantran88vn Quote  Post ReplyReply Direct Link To This Post Topic: Focus area of LA-EA4 with SSM lenses
    Posted: 01 January 2019 at 04:03
Hello everyone,
I currently own A7II with some A-mount lenses non-SSM version working via EA4. I'm wanting to have some SSM lenses like 70-300 ssm so I'm wondering whether I can bypass the AF of EA4 to use on-body AF. Then it will be similar to EA3 (full focus area) with some light loss.
Someone please help me to clarify.
Thank you and Happy New Year!
 



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Hezu View Drop Down
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Post Options Post Options   Quote Hezu Quote  Post ReplyReply Direct Link To This Post Posted: 01 January 2019 at 15:46
Nope, with LA-AE4 you always get just those centrally located 15 focus points from this adapter regardless of which sort of autofocus mechanism the lens uses. For wider selection of AF points with adapted A-mount lenses with builtin focusing motor you will need LA-EA3, but then it won't provide autofocus if the lens uses screw-driven focusing...
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tantran88vn View Drop Down
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Post Options Post Options   Quote tantran88vn Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2019 at 04:17
Thank you so much for your clarification! So I'd better to go with EA3 adapter.
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Post Options Post Options   Quote Hezu Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2019 at 16:14
For A-mount lenses with builtin focus motor LA-EA3 indeed offers better AF points coverage, however with long focal lengths (my experience is with Sony 70-400G and Tamron 150-600), LA-EA3 offers less reliable AF than the trusty SLT AF in LA-EA4.
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2019 at 17:32
A7II + LA-EA3 + 70-300's -> hardly any AF
Sony A68 A77II A6000 A7II LA-EA3 LA-EA4 MC-11
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8
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tantran88vn View Drop Down
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Post Options Post Options   Quote tantran88vn Quote  Post ReplyReply Direct Link To This Post Posted: 03 January 2019 at 01:49
Oops. I didn't expect that
I tested EA4 with some A-mount lenses (Minolta 100 macro, 75-300 new) in low light yesterday. They are noisy but I was surprised AF speed is just little slower than FE lenses, always spot on except low contrast flat surfaces. I think it's enough at least for still shoots on my current A7ii. It may be different on A7iii that as I heard improves significantly AF with EA3.
 



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Bob J View Drop Down
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 03 January 2019 at 10:16
I've found the a7ii+LA-EA3+70-300G to work quite well...
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Mestari View Drop Down
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Post Options Post Options   Quote Mestari Quote  Post ReplyReply Direct Link To This Post Posted: 12 February 2019 at 12:20
Funny thing is that in my case I always get better results using a6000+LA-EA4 than native setup with a900 and central AF point. Especially precision is better. I always have the focus nailed down exactly right. With a900 it's a hit and miss.
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