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Rumor: LA-EA4r Monster Adapter being developed?

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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 12:04
Originally posted by nandbytes nandbytes wrote:

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".
Well, that was not the point I was making. Nikon first has to do an adaptor for their own lenses before they will develop one for A-mount.

But if you want to go that route: I do not think Sony is "wrong" but it could be better. Where Nikon is "wrong" for offering no adaptor at all. We had this discussion before: I am more like the glass is half full.

I almost feel like people are anti what already exists - "brand x is doing this badly, so should the brand y I shoot be as bad"

TBH I do not think we differ that much. Sony could develop an adaptor that is like a LA-EA3 with screw-drive motor. And they would sell a bunch - I do not understand why they do not do that - and annoy Nikon in the process.

Originally posted by pegelli pegelli wrote:

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.
I am not that impressed by the video. It had loads of the artefacts of Facebook Video. Through this I could see it did focus - so, yes, proof of concept there. But
we already knew this from the A99m2. From the video I am not impressed with the AF speed shown, as it is just a few centimetre difference and it was hardly pushing its limits. Like Pegelli I would like some more thorough testing.

Anyway, interesting development!
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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 12:35
It's an interesting development, which I hope turns out well. The downside is that it is based on an LA-EA4 - first you have to buy one (not cheap) and then do a DIY conversion using this guys electronics (not for the faint-hearted).

I won't be rushing to be the among the first to try it, but will watch developments with interest. Perhaps a complete adapter based on this principle will come along from one of the third-party adapter manufacturers.
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 15:06
Originally posted by Matt Matt wrote:

The video was quite convincing.

It's a demonstration with one lens.

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.

That was reported years ago here at dyxum.

I don't know if I can find the old posts, but maybe someone else can, or the contributors to that thread might be reading this and chime in.

A couple of members tested a small selection of screw drive lenses on the A99II with the SLT mirror removed. A few were able to autofocus very well. Others were not. That part might still be true with this hacked adapter.
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Post Options Post Options   Quote Matt Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 15:14
Yes, that all may be true, but it still shows that screw drive lenses are not excluded from OSPDAF. I have hopes for the future that it will be done properly.

OSPDAF has come a long way since it first came on the market. Every time with new technology, you always here how that and that cannot be done etc., based on the state at the time the new technology comes on the market.

Examples: we will never have EVF in a professional camera. Mirrorless camera's will always lag behind in AF performance.

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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 15:32
Originally posted by Matt Matt wrote:

Yes, that all may be true, but it still shows that screw drive lenses are not excluded from OSPDAF. I have hopes for the future that it will be done properly.

OSPDAF has come a long way since it first came on the market. Every time with new technology, you always here how that and that cannot be done etc., based on the state at the time the new technology comes on the market.

Examples: we will never have EVF in a professional camera. Mirrorless camera's will always lag behind in AF performance.

The problem discussed in those old threads (as far as I remember) was the fact that OSPDAF would be increasingly difficult as the amount of mass needed to focus increased. So while this video is a nice "proof of concept" (just like the expriments with the "mirrorless A99ii") the proof for me will be a real life situation with a heavy lens. They talk in their text about it working well with the 135/1.8 and if that's true I would like to see a video of that, and not inside on a high contrast LCD screen but a real life outside scene.

In the meantime the "standard" LA-EA4 might be too old technology for some, using it this April foolishness again with the Minolta 100/2 it does everything I need AF wise.

I truly hope they succeed as any technology that breathes new life into old A-mount lenses is a plus, but not everybody wants/needs the AF frills of the latest cameras and for those that don't I think the base LA-EA4 adapter is pretty good.
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Post Options Post Options   Quote Snegren Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 18:41
I'm happy with LA-EA3 and focus peaking on my screw drive lenses. After all, LA-EA4 is expensive kit. I would also be happy with a cheap dumb adapter that gives me manual aperture adjustment. My short lenses are generally at f/8 and the other ones tend to be wide open. But that's just me.
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 19:03
Originally posted by sybersitizen sybersitizen wrote:

Originally posted by Matt Matt wrote:

The video was quite convincing.

It's a demonstration with one lens.

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.

That was reported years ago here at dyxum.

I don't know if I can find the old posts, but maybe someone else can, or the contributors to that thread might be reading this and chime in.

I found the relevant parts of that discussion:

https://www.dyxum.com/dforum/a99ii-first-impressions_topic123262_post1465345.html#1465345

https://www.dyxum.com/dforum/slt-the-nikon-way_topic132921_page4.html

So yes, the capability of that working with some lenses has been known for years.
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Post Options Post Options   Quote Ken Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 19:47
I have kept 8 of my best A mount lenses (both Sony & Minolta) which I use with my LAEA3 and 4 as applicable. But I have yearned for an adapter like this. Many have dubbed this an LAEA5. What would be interesting is to see the speed of AF acquisition with screw drive motors and heavy front elements on lenses such as the 135mm/f1.8.
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2020 at 22:30
Originally posted by Ken Ken wrote:

I have kept 8 of my best A mount lenses (both Sony & Minolta) which I use with my LAEA3 and 4 as applicable. But I have yearned for an adapter like this. Many have dubbed this an LAEA5. What would be interesting is to see the speed of AF acquisition with screw drive motors and heavy front elements on lenses such as the 135mm/f1.8.


Odds are that AF speed will be the same as the unmodified LA-EA4. Same power feeding same motor controlled by camera electronics capable of driving far faster motorised lenses.

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Post Options Post Options   Quote coyote1086 Quote  Post ReplyReply Direct Link To This Post Posted: 29 April 2020 at 17:56
Originally posted by Phil Wood Phil Wood wrote:

Originally posted by Ken Ken wrote:

I have kept 8 of my best A mount lenses (both Sony & Minolta) which I use with my LAEA3 and 4 as applicable. But I have yearned for an adapter like this. Many have dubbed this an LAEA5. What would be interesting is to see the speed of AF acquisition with screw drive motors and heavy front elements on lenses such as the 135mm/f1.8.


Odds are that AF speed will be the same as the unmodified LA-EA4. Same power feeding same motor controlled by camera electronics capable of driving far faster motorised lenses.



I always opt for AF accuracy over AF speed. If it can nail the focus correctly, I will take it.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 29 April 2020 at 18:49
Originally posted by Phil Wood Phil Wood wrote:

Odds are that AF speed will be the same as the unmodified LA-EA4. Same power feeding same motor controlled by camera electronics capable of driving far faster motorised lenses.
There is more to AF then this. I do not know what the real problem is facing SLR lenses on mirrorless cameras but I can see that the corner light hits the sensor might be relevant, the micro contrast of the lens, micro-adjustments etc. We'll see when an independent source gets his hands on this thing.
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Post Options Post Options   Quote huangqi416 Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2020 at 11:58
Hey everyone--

I am a Minolta enthusiast from China (Mainland region) , and found that a team in this country recently announced that they are going to sell a unofficial upgrade kit for the EA4, which enables PDAF feature on some Sony A7 bodies for those vintage Minolta lens without SSM or SAM (screwdriver lens) .

As mentioned before, this is an upgrade kit. That means you need a working LA-EA4. They claimed that the process for changing the components wouldn't last long.

They are still working on the project, and will be ready for shipping in couple months. Not all off the screwdriver lenses are supported, as they want to make sure everything works smoothly---and it takes time for them to rent some lens they don't have, and test them out. I've checked the list couple days before and saw that they are going to support some decent prime lenses(ONLY) including 35 /1.4, 50 /1.7, 500 reflex and something like that.

I'm going to put some basic info here, and try to catch up if there's any update from the social media account of that team.

Product Name: MonsterAdapter LA-EA 4r
Feature(s): Enable PDAF for some A-mount screwdriver lenses with full control
Limitations:
3rd gen A7 bodies required--minimum
part of the prime lenses supported ONLY (I will post the full list below later)
you need to mod the LA-EA4 by yourself--which means you should take your own risk
(but this mod process is reversible--if you have the original guts)
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Post Options Post Options   Quote huangqi416 Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2020 at 12:35
Here’s a list of supported lens: (may be changed later)

Minolta AF 20/2.8 Old
Minolta AF 20/2.8 New
Sony AF 20/2.8
Minolta AF 24/2.8 Old
Minolta AF 28/2 Old
Minolta AF 35/1.4
Minolta AF 35/1.4 G New
Sony AF 35/1.4 G
Minolta AF 35/2.0 Old
Minolta AF 35/2.0 RS
Minolta AF 50/1.4 Old
Sony AF 50/1.4
Minolta AF 50/1.7 Old
Minolta AF 50/1.7 New
Sony Planar T* 85/1.4 ZA
Minolta AF 100/2.0
Sony Sonnar T* 135/1.8 ZA
Minolta AF 200/2.8 APO(1st revision ONLY)
Minolta AF 500/8 Reflex

They will release several firmware updates for users to flash the chips, to enable the support for more lenses
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2020 at 13:47
Originally posted by addy landzaat addy landzaat wrote:

Originally posted by Phil Wood Phil Wood wrote:

Odds are that AF speed will be the same as the unmodified LA-EA4. Same power feeding same motor controlled by camera electronics capable of driving far faster motorised lenses.
There is more to AF then this. I do not know what the real problem is facing SLR lenses on mirrorless cameras but I can see that the corner light hits the sensor might be relevant, the micro contrast of the lens, micro-adjustments etc. We'll see when an independent source gets his hands on this thing.


True, but the additional factors are to do with the optical performance of the lens, not its weight - which the question was about.

As it is the latest information regarding the adapters limited use excludes most heavy lenses anyway.
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