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Rumor: LA-EA4r Monster Adapter being developed?

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Post Options Post Options   Quote mirthseeker Quote  Post ReplyReply Direct Link To This Post Topic: Rumor: LA-EA4r Monster Adapter being developed?
    Posted: 28 April 2020 at 02:35
The following popped up in the Facebook Sony A77/II - A99/II Photographers (closed) Group overnight:

It is also on Sony ALPHA Camera-TALK (open group)

Video

Development of a modified LA-EA4 adapter for use of A-Mount lenses on the A7III, by replacing the chip of LA-EA4, removing its translucent mirror, blocking its AF module, reconfiguring or adding a modified chip, and allowing the mirrorless bodies' phase detection AF to take over.

"BREAKING!!! Hey guys, I think many of you may be interested in this! Here showing in this video are Sony a7III, LA-EA4 and Minolta screw drive AF 35/2 new. Watch the clip and tell me what you have found extraordinary. *************************** Update:This is a Re-engineered Sony LA-EA4 named the MonsterAdapter LA-EA4r that just comes out for a few days developed by a friend of mine Mr Zhou (web name gururu ) from China who is an absolute geek and has previously developed Nikon-Sony E AF adapter and Minolta V-E MF adapter. It took him 3 years to develop this EA4r to replace the chip of LA-EA4, remove its translucent mirror, block its AF module and allow the mirrorless bodies' phase detection AF to take over. So with this adapter you can use the gems of A mount like the Sony 135/1.8ZA, 85/1.4ZA and Minolta G lenses, which are all screw drive AF, on the latest Sony mirrorless bodies to have the same AF capability like using the SSM A mount lenses with Sony LA-EA3 adapter. So by doing this, you can 1. gain 1/3 to 1/2 of a stop of light without the translucent mirror; 2. use all AF points/features whatever the body can provide including eye focusing tracking for still shooting (temporarily not for shooting video); 3. have really precise and reliable focusing and theoretically eliminate the need of micro AF adjustment which is a persisting pain in the ass caused by independent AF module in SLR/DSLR. 4. use those A mount legendary screw drive AF lenses which are so much cheaper now in used market than their E mount counterparts and the Minolta color is back on the latest sensor!!! Mr Zhou started this project simply powered by his personal enthusiasm 3 years ago and has done an incredible job purely on his own, but of course also been encouraged and pushed by his friends very hard through the years. Finally dozens of the EA4r 1.0 version have been assembled and distributed to a small group of A mount loyalties in China for testing and the feedback will be collected to upgrade the firmware to make the adapter working more reliably and supporting more lenses. Hopefully the more mature version will be officially launched soon and available to all users worldwide. Mr Zhou initially was not planning to commercialize this project but we will keep pushing him really hard to make it happen."



Edited by mirthseeker - 28 April 2020 at 03:47
 



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paso144 View Drop Down
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Post Options Post Options   Quote paso144 Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 07:48
Never did a deep dive in the LA-EA4 adapter but I was genuinely surprised that Sony opted for a closed loop AF system based on translucent mirror, instead of using the suburb contrast detection system of the A7/A9 series. The above approach feels far more logical and cheaper to me.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 08:57
Originally posted by paso144 paso144 wrote:

Never did a deep dive in the LA-EA4 adapter but I was genuinely surprised that Sony opted for a closed loop AF system based on translucent mirror, instead of using the suburb contrast detection system of the A7/A9 series. The above approach feels far more logical and cheaper to me.
The early NEX and A7 cameras had lousy AF results with lenses designed for the AF system of DSLR's. The LA-EA2/4 system at that time was much, much better then an SSM/SAM lens using the LA-EA3.

We are now nine years on and on-sensor phase detect was introduced and recent developments in AF algorithms might mean that cameras like the A9(II) and A7r4 are good enough with DSLR lenses - but do not try to use this on a first generation A7 camera as I expect it won't work that good....
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Post Options Post Options   Quote Matt Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 09:18
This shows that today's on sensor PDAF can work perfectly with screw drive lenses.

I cannot imagine that Sony is not aware of this. It would mean that any future A-mount camera (if that will ever happen), will be mirrorless, like E-mount.

If I was Sony, I would get my hands on that adapter, before Canon or Nikon does. Image that: an adapter for Canon/Nikon mirrorless that can operate the Minolta screw driven lenses with full functional AF. Then the current A-mount users know where to go.
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Post Options Post Options   Quote Snegren Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 09:25
My A-mount SSM lenses focus on A7 + LA-EA3, but it's like an eagle hunting. Lots of circling before the strike. On A7Rii AF works much better as it has on-sensor phase detect AF. Don't own a LA-EA4, happy to manually focus using the LA-EA3, but screw-drive AF on a modified LA-EA4 would be sort of cool.
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 09:58
If this is true shame on Sony for not providing this many years ago.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 10:02
Originally posted by Matt Matt wrote:

This shows that today's on sensor PDAF can work perfectly with screw drive lenses.
did you try the adaptor?

If I was Sony, I would get my hands on that adapter, before Canon or Nikon does. Image that: an adapter for Canon/Nikon mirrorless that can operate the Minolta screw driven lenses with full functional AF. Then the current A-mount users know where to go.
Nikon did not even bother with a screw drive adaptor for there own screw drive lenses. At least Sony gave us the LA-EA2 and 4.
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 10:07
Originally posted by addy landzaat addy landzaat wrote:

Nikon did not even bother with a screw drive adaptor for there own screw drive lenses. At least Sony gave us the LA-EA2 and 4.


two wrongs don't make a right

i almost feel like people are anti-imporvement - "brand X is doing this badly so should the brand Y i shoot be any better".
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 10:18
Originally posted by nandbytes nandbytes wrote:


two wrongs don't make a right
And what does two rights make?
Originally posted by nandbytes nandbytes wrote:


i almost feel like people are anti-imporvement - "brand X is doing this badly so should the brand Y i shoot be any better".
Fortunately brand Y did better

Interesting development, but like Addy I first need to see some tests how this works with screw drive lenses. It's easy to create a hype, it's much harder to deliver.
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Post Options Post Options   Quote Matt Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 10:25
Originally posted by addy landzaat addy landzaat wrote:

did you try the adaptor?

The video was quite convincing. It is at least great to see that something that a lot of people thought could not be done (AF screw drive lenses on a mirrorless camera using on sensor PDAF), is feasible.

Nikon did not even bother with a screw drive adaptor for there own screw drive lenses. At least Sony gave us the LA-EA2 and 4.


Nikon has also abandoned screw drive lenses on their low end DSLRs, so it looks like Nikon is screwing its customers.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 10:28
Originally posted by Snegren Snegren wrote:

My A-mount SSM lenses focus on A7 + LA-EA3, but it's like an eagle hunting. Lots of circling before the strike. On A7Rii AF works much better as it has on-sensor phase detect AF....

The original A7 has on-sensor phase detect. Sony just didn't use it with the LA-EA3. They did add that ability to the A7II.
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 10:50
Originally posted by Matt Matt wrote:

Originally posted by addy landzaat addy landzaat wrote:

did you try the adaptor?

The video was quite convincing. It is at least great to see that something that a lot of people thought could not be done (AF screw drive lenses on a mirrorless camera using on sensor PDAF), is feasible.
It's certainly interesting to see it working with a small/light nifty 50, but what really would be convincing is some outside tests with heavy glass like the 135/1.8 or 80-200 APO.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 10:58
... Finally dozens of the EA4r 1.0 version have been assembled and distributed to a small group of A mount loyalties in China for testing and the feedback will be collected to upgrade the firmware to make the adapter working more reliably and supporting more lenses. Hopefully the more mature version will be officially launched soon...

Considering the limitations of Hybrid AF on the A99II, AF-D on the A99, and Hybrid AF on EF adapters, I don't expect much.

Sigma never got their native 19/2.8, 30/2.8, and 60/2.8 primes working properly with fast hybrid AF. Metabones hasn't gotten any EF lenses working properly. Sigma doesn't support AF-C with their Global Vision lenses on the MC-11. No third-party native lens supports 20 FPS on the A9 models. Expecting one person to solve the issues of getting older lenses working is not realistic. Getting one lens to somewhat work is a big accomplishment.

I am surprised the LA-EA3 works as well as it does.

The A7III on-sensor PDAF is good, but the LA-EA4 can detect contrast that the sensor can't. The A7III uses contrast-detect quite a bit with native lenses which is slow with fast primes.
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 11:58
I've wondered why Sony didn't produce something like this when on-sensor phase detect came out, but I'm guessing that the fact that Nikon don't do it either might mean it has some downsides (I remember that Nikon have a patent for something that looks like an La-EA4, but havent produced it commercially).

After all this gentlemen may have made it work, but that might involve the cost of an LA-EA4, the cost of modifying it and the possibility that it doesn't AF quite as well as it did originally.
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