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Sony LA-EA5 Adapter $250 October

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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: 09 September 2020 at 00:52
Xi lenses fully work on the A68. I don't understand the lack of support for the first-party teleconverters on the LA-EA adapters.
Sony A7III NEX-5T HVL-F45RM LA-EA3 LA-EA4 MB-IV MC-11 EF-E II MD-NEX KR-NEX DA-NEX
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9 AF-P/Q
 



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sybersitizen View Drop Down
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2020 at 05:07
Originally posted by ddd ddd wrote:

the TCs were not supported by an adaptor, there are techn limits inside a-mount protocol. I would like to see them work, as I own them and the lenses that make real use of them, but I belive it can't be done.

What do you propose are the specific technical limits that prevent TCs from being supported by adapters?
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gigo View Drop Down
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Post Options Post Options   Quote gigo Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2020 at 06:01
Another "A review that I have touched the mount adapter LA-EA5 at the Sony store."
http://kunkoku.com/laea5-3.html
(Japanese)
7RIV,9,6300,99II.., FE:16, E:6, A:18 lenses
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gigo View Drop Down
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Post Options Post Options   Quote gigo Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2020 at 06:18
Originally posted by ddd ddd wrote:

Originally posted by gigo gigo wrote:

Lenses that are on the 99II support list but not on the LA-EA5+7RIV list.

AF PZ 35-80/4-5.6 <- ??
the TCs were not supported by an adaptor, there are techn limits inside a-mount protocol. I would like to see them work, as I own them and the lenses that make real use of them, but I belive it can't be done.

The xi lenses were for a long time not fully supported by minolta already years ago, and most of them are not worth the effort. I wondered, that Sony supported them as far as possible up to the latest a-mount body.

And the PZ ... one of the real gems ... just kidding, it is maybe the worst a-mount lens ever build

-thomas


Personally, the application that requires a teleconverter has been moved to ILCE-9+70200GM/100400GM/200600G, so I am not too dissatisfied even without support.

The only remaining telephoto is the 70300GII, which does not support a teleconverter.

Only 200 macros are left in the lens compatible with the tele-converter, and it is used only when I want to increase the magnification to 1x or more.
It is rarely needed.

I used it when I wanted more magnification with STF, but I sold it.

I found "AF PZ 35-80/4-5.6" at the auction. I thought it's clear that you can't expect anything from a lens that looks so cheap.

7RIV,9,6300,99II.., FE:16, E:6, A:18 lenses
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gigo View Drop Down
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Post Options Post Options   Quote gigo Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2020 at 06:34
Originally posted by ddd ddd wrote:

Originally posted by gigo gigo wrote:

Lenses that are on the 99II support list but not on the LA-EA5+7RIV list.

AF PZ 35-80/4-5.6 <- ??
the TCs were not supported by an adaptor, there are techn limits inside a-mount protocol. I would like to see them work, as I own them and the lenses that make real use of them, but I belive it can't be done.

The xi lenses were for a long time not fully supported by minolta already years ago, and most of them are not worth the effort. I wondered, that Sony supported them as far as possible up to the latest a-mount body.

And the PZ ... one of the real gems ... just kidding, it is maybe the worst a-mount lens ever build

-thomas


It is not possible to connect two converters in A-Mount. Because there is only one identification bit/address bus/contact.
(Conversely, by cutting off one contact, it is possible to make the body think that the lens does not have a teleconverter.)

However, I have no idea why it is useless to stack A to E converters on one A-Mount converter.
The LA-EA4r developer wrote that "teleconverter support is difficult", but there is no explanation for the reason...

7RIV,9,6300,99II.., FE:16, E:6, A:18 lenses
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sybersitizen View Drop Down
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2020 at 06:50
Originally posted by gigo gigo wrote:

It is not possible to connect two converters in A-Mount. Because there is only one identification bit/address bus/contact.

I'm doing it right now with two Kenko TCs. The camera (A77) can even autofocus with them if the lens is fast enough.
 



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Post Options Post Options   Quote rovhazman Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2020 at 07:08
Originally posted by gigo gigo wrote:

The LA-EA4r developer wrote that "teleconverter support is difficult", but there is no explanation for the reason...

I also wonder about that. If Sony can make a camera that supports a-mount teleconverters (the a99II does support it), why the adapter cannot?
The adapter only needs to translate the a-mount "language" to e-mount "language". It might be that the AF will not be ideal, but right now with current adapters (LA-AE 3 and LA-AE 4) you cannot even control the aperture!
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Post Options Post Options   Quote gigo Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2020 at 07:14
Originally posted by sybersitizen sybersitizen wrote:

Originally posted by gigo gigo wrote:

It is not possible to connect two converters in A-Mount. Because there is only one identification bit/address bus/contact.

I'm doing it right now with two Kenko TCs. The camera (A77) can even autofocus with them if the lens is fast enough.

Did you read the next line?
Wasn't it just talking about genuine?
It does the encoding by itself and doesn't let the body know that it has a teleconverter.
Although it doesn't follow the A-Mount design, it's smarter, but I'm guessing it was considered "a wasteful luxury that requires extra circuitry" in the old days of A-Mount development.
7RIV,9,6300,99II.., FE:16, E:6, A:18 lenses
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2020 at 07:23
Originally posted by gigo gigo wrote:

Originally posted by sybersitizen sybersitizen wrote:

Originally posted by gigo gigo wrote:

It is not possible to connect two converters in A-Mount. Because there is only one identification bit/address bus/contact.

I'm doing it right now with two Kenko TCs. The camera (A77) can even autofocus with them if the lens is fast enough.

Did you read the next line?
Wasn't it just talking about genuine?
It does the encoding by itself and doesn't let the body know that it has a teleconverter.
Although it doesn't follow the A-Mount design, it's smarter, but I'm guessing it was considered "a wasteful luxury that requires extra circuitry" in the old days of A-Mount development.

My Kenko 2x does modify the aperture and focal length, but my 1.5x doesn't do either of those things, so it appears completely invisible to the camera. I can't say what would happen if I mounted two 2x versions. Maybe they'd report 4x the focal length and a 4-stop aperture reduction or maybe they'd just get confused.
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Post Options Post Options   Quote ddd Quote  Post ReplyReply Direct Link To This Post Posted: 10 September 2020 at 00:21
Originally posted by sybersitizen sybersitizen wrote:

What do you propose are the specific technical limits that prevent TCs from being supported by adapters?
A-mount protocol allows only one device between lens and body. That was a design decision made by Minolta in the late 1970s or early 1980s. Such device may be a TC, an extension tube (with correct conversion of the protocol parameters, even if Minolta never made one) or an adapter. Every E-mount body (ok I am not shure about the industrial E-mount bodys, as I never get my hands on one) contains the A-mount protocol engine, NEX, ILCE, PXW-FS/FX, MPC3610. The LA-EA adapter "only" convert the electrical interface from synchronous SPI with 5V CMOS levels to asynchronous serial with 3V levels. The high level logical protocol has many similarities. But for the protocol the adapter is this one allowed device between lens and body, and no second device is possible.

The chinese developer of the Monster adapter replacement board told us already, that support for TCs ist difficult.

If you (and others) are interested in a more detailed description on how the protocol and the TCs work, I may set up a thread for this informations, as it will crash this thread, and I don't like to get in trouble with the moderation

-thomas
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 10 September 2020 at 01:29
Originally posted by ddd ddd wrote:

Originally posted by sybersitizen sybersitizen wrote:

What do you propose are the specific technical limits that prevent TCs from being supported by adapters?
A-mount protocol allows only one device between lens and body. That was a design decision made by Minolta in the late 1970s or early 1980s. Such device may be a TC, an extension tube (with correct conversion of the protocol parameters, even if Minolta never made one) or an adapter. Every E-mount body (ok I am not shure about the industrial E-mount bodys, as I never get my hands on one) contains the A-mount protocol engine, NEX, ILCE, PXW-FS/FX, MPC3610. The LA-EA adapter "only" convert the electrical interface from synchronous SPI with 5V CMOS levels to asynchronous serial with 3V levels. The high level logical protocol has many similarities. But for the protocol the adapter is this one allowed device between lens and body, and no second device is possible.

The chinese developer of the Monster adapter replacement board told us already, that support for TCs ist difficult.

I see. But that presumably means that my Kenko TCs - in particular the 1.5x TC that appears to be 'invisible' to the camera - should not pose a problem.
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Post Options Post Options   Quote Kjell Quote  Post ReplyReply Direct Link To This Post Posted: 10 September 2020 at 16:16
I thought Sony would give us something for A-mount now when a99 has reached eight years and a99ii four, both in the coming week. And I'm really thankful over Sony gives us the LA-EA5, and right now perhaps even more for the chinese Monster adapter.

But will Sony give us good autofocus compability with most A-mount lenses for a7r4 or a6600 only? I would be much more tempted to buy the new adapter together with a a7s3 (yes, absolutely even without video af) or a9ii, since those cameras would be a much better complement to my a99ii (or to the a77 I sold just recently).
A99ii, A850, A580, NEX6, 70-400;KM 5D, 9, 18-70, 28-135, 50/1.7, 58, 200/2.8, 300/2.8;CZ 24, 85, 135;∑ 12-24, 18-50/2.8, 24/1.8, 35/1.4, 50/1.4, 70;T 15-30, 18-250, 24-70, 70-200
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Post Options Post Options   Quote Dena Quote  Post ReplyReply Direct Link To This Post Posted: 10 September 2020 at 18:02
Originally posted by adhox adhox wrote:

Originally posted by Dena Dena wrote:

So am I right.... I'll need the 7Rm4 and the #5 adaptor to use my old Minolta on AF. Not that I use the AF much anyway, but I want to for portrait work. My good Minolta are:

100mm macro D
50 mm f2.8 Macro RS
80-200mm f2.8 white version
85mm f1.4 G

the 7rm3 won't do af with the new adaptor?

The A7Riii and LA-EA5 should work with SSM/SAM lenses, but not those four screw drive lenses.

At this stage, the LA-EA5 will only AF screw drive lenses if mounted on the A7Riv or A6600. Maybe other existing bodies will be added, maybe not. I would hope that some new bodies (A7iv?) will work.

As the screw drive AF is not for video, I wouldn’t expect it on the A7Siii, A7C or other bodies that emphasise video.


Thanks so much....Guess I'll wait and see what happens, and let others test it all out and price of a7r4 drops, (maybe). Roadkill, ewww. In the meantime, I might just buy a used a99 so I can use my Minolta 85 f1.4 on FF.
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Post Options Post Options   Quote gigo Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2020 at 06:16
The ILCE-7SM3 compatibility information is available.
https://support.d-imaging.sony.co.jp/www/cscs/lens_body/?area=jp&lang=jp&s_pid=cs_ILCE-7SM3#notes_adp_0
(Japanese Page.)
As we already knew, AF with screw drive type lenses is not supported.
7RIV,9,6300,99II.., FE:16, E:6, A:18 lenses
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