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a99ii lock on af with vintage Minolta AF lenses

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mainoo View Drop Down
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Post Options Post Options   Quote mainoo Quote  Post ReplyReply Direct Link To This Post Topic: a99ii lock on af with vintage Minolta AF lenses
    Posted: 08 October 2020 at 05:49
So I am looking to escape from my current A6500 with LA EA4 setup because of the restrictive spread of AF points on the LA EA4 and its unreliability (too many out of focus shot even when I am doing the right thing). What I am trying to achieve is a high number of in-focus shots when both myself and the subject are moving (worst case) or one or the other is moving. This is all in good daylight.

The lenses I am interested in are old minolta lenses and a representative sample is:

28 - 135
100 - 300 APO
100 - 200
35 -105 (original)
24 - 50
135 1.8*
28 - 75 SAM*

*I expect these will work with either of the options I am considering.

With the arrival of the LA EA5, I am considering the following options:
A99 - I would go for this except for the restrictive spread of AF points. It's cheap and meets my needs well but I have ruled it out.

A99 Ii or A6600 with LA EA5.

If the A6600/LA EA5 combo can do real time tracking with the afore-mentioned lenses, there will be no contest - the ability to set focus point and to initiate tracking by touch across its many AF points will far outstrip whatever the A99 ii can offer. But if it doesn't deliver then the A99 ii is my. plan B.

Whilst I wait to see what the A6600/LA EA5 combo does in real life, I am looking for any real world experiences from A99 ii users with any of the lenses mentioned above. I know all these lenses will force the AF system to use the dedicated phase module (ie no OSPDAF) - my question is will Lock on AF work as advertised with these lenses? Specifically, if I set focus area to (say) lock on AF centre, will tracking be initiated when I depress the Shutter (AF On) button and will it be maintained for all the AF points in the dedicated module? I am aware that for some lenses the number of points will be reduced from 79 to 61.


NB - I know about the 80-200 HS (I've owned 2) - I am specifically interested in knowing whether I can achieve my goals with the lenses listed above.

Thanks in advance



 



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SnowFella View Drop Down
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 07:34
Haven't used the lock on AF all to much with my 99ii but what I've found is that every lens I've tried will try to track across all available AF points.
What I've also found is that it's highly dependent on subject contrast the background and light levels if the camera actually will track properly.

I have a few of the mentioned lenses, (100-200, 28-135, 24-50 and 35-105) and could test it out quickly if I get a chance.
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mainoo View Drop Down
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Post Options Post Options   Quote mainoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 08:21
Thanks for responding.

If you were able to test it, I would be very grateful. What I am trying to determine is:

does lock on AF just work with these lenses?
If not, does any sort of tracking work (centre lock on, for example).
How quick is focus acquisition?
How sticky is it compared to other lenses that work normally?
What is the hit rate?

Any answers to any of these questions would be a big help.

Thanks again
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mainoo View Drop Down
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Post Options Post Options   Quote mainoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 08:31
oh, and please add AF 500/8 to the list.
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 11:56
Did a quick test with the 4 and indeed they all try to do the lock on but not all can stick to a target, find the more a target is dominant in the frame the better it tracks it as I pan after an initial lock.
As for the AF 500/8, even on the 99ii it's a center spot only lens. The lens ID in it will default any A-mount camera to only use the center spot.

Seen some tests using the 500/8 re-chipped on the 99ii that will focus away from the center spot but I'm not really game enough to butcher my old reflex lens like they did.
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Post Options Post Options   Quote mainoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 12:40
So grateful to you for taking the time to do this. Gratifying to know that that the A99 ii at least attempts to acquire and maintain focus. I'm sure the performance will vary from lens to lens.

Re the 500/8, that is what I expected. The video below shows the A7R4/LAEA5 combo with a variety of A mount lenses. Towards the end of it, we are shown the 500/8 and there are multiple flickering focus points but all within the central square (which I assume means that the area was set to sone no-spot mode). That suggests that the LAEA5 will real time track even with that lens (as long as you can keep your subject in that central square. Though neither extensive nor exhaustive, it, at least, gives us hope that the new adapter really might work with all A mount glass.

https://www.youtube.com/watch?v=-V9_-PYvCHs

Thanks very much, once again

 



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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: 08 October 2020 at 13:24
Originally posted by mainoo mainoo wrote:

So I am looking to escape from my current A6500 with LA EA4 setup because of the restrictive spread of AF points on the LA EA4 and its unreliability (too many out of focus shot even when I am doing the right thing). What I am trying to achieve is a high number of in-focus shots when both myself and the subject are moving (worst case) or one or the other is moving. This is all in good daylight.

Are you aware that the LA-EA adapters only track focus during bursts at the LO frame rate? When you use the faster frame rates the focus is locked at the first frame of a burst. I generally find the LA-EA4 focus tracking quite good--often better than native lenses.

The LA-EA5 has lifted that LO frame restriction when used on the A7RIV and A6600.

I haven't found Lock On AF useful on either mount, though I can't say I've even tried it lately. The A77II and A68 do something very similar to Real-time Eye AF on the recent E-mount bodies, but that is limited to their dedicated AF points. It doesn't sound like the A99II does that.

Edited by QuietOC - 08 October 2020 at 13:33
Sony A7III A7RII NEX-5T HVL-F45RM LA-EA3 LA-EA4r MB-IV MC-11 EF-E II TLT ROKR 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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mainoo View Drop Down
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Post Options Post Options   Quote mainoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 13:33
Yes, that is what I meant when I said even when I am doing things right. Various things have caught me out - not being in AF-C when attempting to track, not being in lo frame rate. But I think even when I have got those things right the tracking was iffy. It often loses my target and arbitrarily selects something else to focus on (this can be observed even before you take the shot)
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Post Options Post Options   Quote mainoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 13:35
But more than anything, the small number of focus points spread over a small area means I always have to have my subject more or less centred.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 13:38
Originally posted by mainoo mainoo wrote:

It often loses my target and arbitrarily selects something else to focus on (this can be observed even before you take the shot)

LOL, that is normal Sony 4D Focus behavior. The most reliable AF-C focus tracking is when the camera is given no choice--using the central AF point. I am curious how well the new Real-time Tracking works.

Edited by QuietOC - 08 October 2020 at 15:20
Sony A7III A7RII NEX-5T HVL-F45RM LA-EA3 LA-EA4r MB-IV MC-11 EF-E II TLT ROKR 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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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2020 at 16:36
Real Time Tracking is really sticky. But the slowness of some A-mount lenses might be a thing.
Re. the AF of the A99m2: it is really good, but not as good as it's contemporaries, like the Canon 5D IV (but it is close) - just check reviews.
Why not follow me on Instagram? @Addy_101
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Post Options Post Options   Quote djfoxy Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2020 at 20:09
Hey there,

You'll find in the video linked below I did a while ago (I have linked with the timecode directly to what you wanna see):

> The first series (dolphin jumps) is A77m2 + Tamron 70-300
> The second series (whale killer) is A99m2 + Sony 28-75/2.8 SAM

mammals jumps exhibits



The last is A99m2 + Minolta 70-210/4

dolphin jump impromptu from sea

Now when it comes to these A-mount cameras, I played with lock on AF on A58, A77m2 and A99m2. Finally I prefer to stick with extensible flexible spot (which is not available on A58).
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