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LA-EA4r Monster Adapter v02

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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: 10 April 2021 at 13:34
Interesting that the modified LA-EA4 focuses on the Alpha 1 because a stock LA-EA4 is limited to manual focus on that body.

Sony allows the 500mm F8 to use slightly more than the center AF points on the LA-EA5. I wonder what criteria they used to choose that area?

Edited by QuietOC - 10 April 2021 at 13:38
Sony A7RIV NEX-5T HVL-F45RM LA-EA5 Metabones-IV Sigma MC-11 Yongnuo EF-E II TLT ROKR MD-NEX KR-NEX DA-NEX
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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: 10 April 2021 at 14:37
Come to think of it - I missed something: if you do not own an A7r4, A1 or A6600 it might be the best option in town.

I guess the reliability of AF decreases when you move out with the 500mm. The Sony DSLT's and Sony/Minolta (D)SLR did the same. I guess their is a range in the centre that is considered good enough. That area might be known from the time the lens was designed and they just used the setting that is closest to that.
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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: 10 April 2021 at 15:12
Originally posted by addy landzaat addy landzaat wrote:

I guess the reliability of AF decreases when you move out with the 500mm. The Sony DSLT's and Sony/Minolta (D)SLR did the same. I guess their is a range in the centre that is considered good enough. That area might be known from the time the lens was designed and they just used the setting that is closest to that.

This is true with any lens. Sony's limitation of many APS-C lenses to only 61 points of the 79 point discrete sensor also feels rather arbitrary. Why only just that amount?

The frame coverage of the on-sensor phase-detect keeps increasing. I assume extra processing/data is needed off-axis phase-detect.

Edited by QuietOC - 10 April 2021 at 15:35
Sony A7RIV NEX-5T HVL-F45RM LA-EA5 Metabones-IV Sigma MC-11 Yongnuo 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 minolta_mutley Quote  Post ReplyReply Direct Link To This Post Posted: 17 April 2021 at 20:39
I ordered a 2nd-hand LA-EA4 + the monster electronics board.

We want all our remaining lenses to work on all my A7's (RII & III).

I'll have to wait a few weeks for the board to arrive - if we're lucky we can use this lens on a future Benelux-Dyxum-meeting.

And yes - we understand that the camera needs to be switches off when changing lenses with the LA-EA4r (i once ruined a 24mm chip on a minolta lens by not powering the camera down - so this is something we won't forget).
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Post Options Post Options   Quote minolta_mutley Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2021 at 12:19
My LA-EA4R arrived yesterday - and this morning i started the "surgery" on the LA-EA4 adapter i bought. Without the video from Mr. Friedman (links on this forum) - it'd have been a little bit more difficult.

This proves the high value of Mr. Friedman and this forum!

You need to be handy with these small cables - it took me about 20' the work done.

And i took a plastic box for sorting screws/nails - to put al small screws and parts inside. So we couldn't switch them.

We tried it on our A7RII (the cheapest to replace- of all my a7's) - and it works fine with my Minolta 50mm f1.7.

One issue still needs to be solved though - how am i going to pimp/paint the adapter - because i want to be able to recognize it. Maybe a few Red R's on all sides?

Idea's are welcome.

Now we'll start soon the tests with all our screw-driven-Minolta-lenses (and we'll switch of the camera while changing lenses! I ruined my 24mm chip on a K-M 24mm f2.8 once and it'll never happen again!).
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