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Adaptors with old minolta glass

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thingomy View Drop Down
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Post Options Post Options   Quote thingomy Quote  Post ReplyReply Direct Link To This Post Topic: Adaptors with old minolta glass
    Posted: 25 May 2018 at 10:24
Considering upgrade to a7iii

This much I know:

LA-EA4 -- has screw drive, has very old and basic phase detect sensor; has potiential to introduce minor image quality isseus from translucent mirror; but fundementally will autofocus old glass. Has potiential for all sorts of back focus issues.

LA-EA3 -- allows full compatibility for SSM and SAM lenses (of which I don't own any) and allows manual focus for old lenses.

I have been using a number of cameras including the a700 for a long time, and the focus is just a little too slow and clustered in the middle for some of my occasional events work, so I know I'm never going to be satisfied with the LA-EA4, but as a dodgy hack, it may get some of the job done. But if the manual focus experiance of the LA-EA3 is really good, that may be better for me.

questions:
1) How many of the nice manual focus assist features work with a7iii, LA-EA3 and old minolta glass? eg peaking, green boxes lighting up all over the frame, magnification etc? How is the overall experiance of this workflow?

2) How many of these also work on the LA-EA4?

(quick rant -- I really wish that someone would fix this mess, the fact that one of the only lens mounts that can't be used with proper AF on FE is Sony's own, and still in production A mount is absurd)
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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: 25 May 2018 at 12:18
The LA-EA4 phase-detect sensor may be fairly old, but I wouldn't say it is clearly worse than the 79-point sensor. I found the A68 AF not to work in situations where the A65 would. It does have a center F2.8 point like the A700.

There definitely seems to be a tradeoff between number of AF points and how well each point works. Sony's on-sensor AF points are all arranged horizontally and only detect horizontal contrast (vertical lines). The peaking is also limited to horizontal contrast only and probably also the contrast-detect AF.

I shot a driving event a couple of weeks ago with my Sigma 50-150 F2.8. The week before I used the A6000 with the 55-210 on wide AF and had quite a few times where the camera decided to focus on pavement instead of the vehicle. So I decided to switch to the center F2.8 AF point in the A68 which was quite effective.

Peaking and magnification work with any lens on Sony cameras. You do have to enable focus magnification with a button or the menu option with A-mount lenses. I am not sure about green AF points lighting up or not. That doesn't happen on the A6000 with any lens.
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 15:43
Originally posted by QuietOC QuietOC wrote:

There definitely seems to be a tradeoff between number of AF points and how well each point works. Sony's on-sensor AF points are all arranged horizontally and only detect horizontal contrast (vertical lines). The peaking is also limited to horizontal contrast only and probably also the contrast-detect AF.

AFAIK, peaking and CDAF are similarly limited in most or maybe all cameras that offer them. They work across horizontal pixels only.
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 16:57
If you are interested In manual focus do what I did and order a $20 fotodiox A to E adapter - totally manual focus of lens and aperture.
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Post Options Post Options   Quote coyote1086 Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 17:48
Originally posted by jkkyler jkkyler wrote:

If you are interested In manual focus do what I did and order a $20 fotodiox A to E adapter - totally manual focus of lens and aperture.


I do not suggest a total manual adapter when the LAEA3 is available which can control aperture and transmit lens EXIF data. And the LAEA3 is not that expensive and it can drive SSM and SAM lenses, in case in the future you acquire these lenses cheap and could be useful.
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 18:19
I got mine in addition to the laea4
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al View Drop Down
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Post Options Post Options   Quote al Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 19:44
Originally posted by coyote1086 coyote1086 wrote:

Originally posted by jkkyler jkkyler wrote:

If you are interested In manual focus do what I did and order a $20 fotodiox A to E adapter - totally manual focus of lens and aperture.


I do not suggest a total manual adapter when the LAEA3 is available which can control aperture and transmit lens EXIF data. And the LAEA3 is not that expensive and it can drive SSM and SAM lenses, in case in the future you acquire these lenses cheap and could be useful.


I would also suggest the LAEA3 over a dumb adapter. The ability for the camera to control the aperture is very helpful.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 20:28
I agree the LA-EA3 is worth it just for the EXIF data. In fact I would like an adapter that could read or even operate the apertures of Minolta SR mount lenses.

It would be nice to stop down A-mount lenses manually which some of the basic A-mount adapters do allow, but which is not possible so far with the Sony adapters--other than the limited aperture preview capability.
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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: 25 May 2018 at 21:17
I have been considering an E mount body - with which I would want to use my existing lenses. It seems that there is no simple solution and that I might need three adapters - one fully manual (Fotodiox?) that allows me to manually focus and stop down the aperture; an LA-EA3 for my SSM/SAM lenses on APS-C and and LE-EA4 for other AF lenses?


I think I shall be sticking to A Mount for a little longer.
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 21:26
Phil, the LA-EA4 can do it all. You can manually focus, stop down the aperture and use all A-mount lenses. There's no need to have all three adapters.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 21:52
By stopping the aperture manually I mean I want to use all the focusing aids like peaking and magnification with the aperture stopped down. I would like to have that ability with A-mount lenses on both A-mount and E-mount cameras. E-mount lenses already operate that way by default.
I don't think the LA-EA4 allows it. All focusing auto or manual has to be done wide open with A-mount lenses except when using those manual adapters with manual aperture control.

There are a few other types of A to E adapters I would also appreciate. An AF capable focal reducer would be quite nice.
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 21:54
Originally posted by pegelli pegelli wrote:

Phil, the LA-EA4 can do it all. You can manually focus, stop down the aperture and use all A-mount lenses. There's no need to have all three adapters.

Exactly my suggestion for the fotodiox was if you want to do all manual you can for cheap and without the bulk. I am moving from a mount to e-mount (if my a7iii ever ships) but have the laea4 so I can have my 70-210 because atm I am unable and unwilling to shell out $1300+ for a long lens. Also will be useful on my 90mm macro and 50 mm 1.4 a-mount if I turn out not liking the native FE 50mm 1.8 I picked up
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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 21:57
Originally posted by pegelli pegelli wrote:

Phil, the LA-EA4 can do it all. You can manually focus, stop down the aperture and use all A-mount lenses. There's no need to have all three adapters.

Mandatory reminder that Minolta xi AF lenses are not compatible with the LA-EA4 adaptor, as I occasionally find out when I take out A- and E-mount cameras at the same time ...
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 23:49
Originally posted by QuietOC QuietOC wrote:

By stopping the aperture manually I mean I want to use all the focusing aids like peaking and magnification with the aperture stopped down ... All focusing auto or manual has to be done wide open with A-mount lenses except when using those manual adapters with manual aperture control.

Not true.

Using a well known trick, you can have manual focusing of any A-Mount lens at the taking aperture when it is directly mounted on an A-mount camera. You can have peaking and focus magnification as well. What you cannot have using this trick, however, is AF.
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