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Now enable 500f8 reflex 79 point focus on a99m2

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shengw1127 View Drop Down
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Post Options Post Options   Quote shengw1127 Quote  Post ReplyReply Direct Link To This Post Topic: Now enable 500f8 reflex 79 point focus on a99m2
    Posted: 29 January 2018 at 02:04
Now we can enable 500f8 reflex 79 point focus on a99m2.

Thanks for SnowFella's advise in http://www.dyxum.com/dforum/how-to-enable-500f8-reflex-61-point-focus-on-a99m2_topic130608.html

I have contacted James LaoT. And he has write an AFC-L1 as AF70-210/F4, fixed focal length 500mm, fixed aperture F4.5

There is all right when it mounted Sony a99m2, the 500mm F8 Reflex can be used as 79 point focus.

The only cons is that 500f8 rf lens's focus hold button is no response. But he said will upgrade a new chip to enable the button.

Now we will try more lens data fitting for 500f8 rf.

Everyone can rechip the 500f8 reflex following the video http://eadpt.com/videos/Rechip500RAF.mp4
 



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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: 29 January 2018 at 03:43
Would love to see an example on how it works on camera, and not only on an A99II but also older bodies.

Not sure I would of de-soldered the old chip though, should be enough room under the baffle to just poke it in underneath.
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Post Options Post Options   Quote mambo Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2018 at 04:22
James Lao's chips are fantastic. I use one on my 600mm f4 lens. The next would be for a chip that allowed AFD on the A99 or the 4D AF on the A99ii. With that, I would have no hesitation upgrading the ROM chip on the 300 and the 600mm primes.

I agree with Snowfella; please show us some shots with the new chip.
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A99,A77ii, Minolta:600 f4HS|300f2.8|200f2.8HS|85G|SAL50f1.4Z|SAL24F2Z|∑35f1.4Art|50f2.8macro|Tamron 180f3.5|
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Post Options Post Options   Quote shengw1127 Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2018 at 06:17
Hi, there are some photos,

http://www.pbase.com/shengw1127/500mm_f8_reflex

All shot by my friend for testing 500mm F8 auto focus.
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Post Options Post Options   Quote Dopol Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2018 at 12:35
Originally posted by shengw1127 shengw1127 wrote:

Hi, there are some photos,

http://www.pbase.com/shengw1127/500mm_f8_reflex

All shot by my friend for testing 500mm F8 auto focus.

That looks very good.
Be yourself; everyone else is already taken
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2018 at 07:19
Indeed it does, now to see a video off the back of the camera and possibly other cameras.
Barely ever use the focus hold button on mine so if it works decently using the center zone on an A77 I'd be gutting mine in a heartbeat!
 



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shengw1127 View Drop Down
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Post Options Post Options   Quote shengw1127 Quote  Post ReplyReply Direct Link To This Post Posted: 09 February 2018 at 05:47
Originally posted by mambo mambo wrote:

James Lao's chips are fantastic. I use one on my 600mm f4 lens. The next would be for a chip that allowed AFD on the A99 or the 4D AF on the A99ii. With that, I would have no hesitation upgrading the ROM chip on the 300 and the 600mm primes.


using James Lao's chips for 4D AF on A99ii is impossible now. Because that the chip is only 5 pin + 1 pin(reserved), no distance information could passed to camera.

I estimate that Minolta's 8-pin patent will be expired in 2019, and then there may be 8-pin chips coming out to avoid annoying patent issues.
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Post Options Post Options   Quote Atom Ant Oz Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2018 at 04:18
Originally posted by shengw1127 shengw1127 wrote:

using James Lao's chips for 4D AF on A99ii is impossible now. Because that the chip is only 5 pin + 1 pin(reserved), no distance information could passed to camera.

I estimate that Minolta's 8-pin patent will be expired in 2019, and then there may be 8-pin chips coming out to avoid annoying patent issues.

Almost 2019 ...

Looking forward to seeing the first brave soul to mod their 500/8 with an 8-pin chip to get full value with the α99ii. I'm not brave enough to be first, but I am curious.
A99ii + 10-20 | 24-70Z | 24-105D | 70-200G | 100-300 APO D | 70-400G
20/2.8 | 28/2.8 | 35/1.8 | 50/1.4 | 135/2.8 | 300/4 | 500/8
A6500 + 10-18 | 16-70Z | 18-135 | 70-200/4G
28/2 | 50/1.8F | 85/1.8
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Post Options Post Options   Quote pdeley Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2018 at 07:08
I'm a big fan of the 500 f8 AF Reflex but I honestly can't think of a reason why I would want to modify one to put it on an a77 or a99 (ii or original) body with 24 Mpx sensor.

The typical mirror design's extremely narrow DOF precludes getting the benefits of that much resolution in all but the most ideal conditions, I've used mine mostly with a700 and a450 and even at 12 or 14 Mpx I rarely get to see single-pixel levels of sharpness.

Plus, working with such thin DOF requires a helicoid capable of very precise adjustment = so much turning to go from minimum distance to infinity and back, that it won't be able match the AF speed of a recent dioptric lens, and even on APS-C bodies vignetting is noticeable so on full frame it will be a lot worse.

What with clean v1 specimens of Tamron's 150-600 being available now on the used market for as little as $600, I would think of that as being a more logical target for chip/contact replacing tricks to get full benefit of the a99ii's hybrid AF system (assuming it doesn't work straight out of the box with the body's 399 on-chip phase AF points? ...Or does it?)
a450, a500, a65, a7, 700si & other 35 mm bodies, Sig 15-30, sam 30 2.8 macro, Pentax 40 2.8 pan, Sig 70 f2.8 macro, Vivi 90 f2.8 macro, Mino 100-400 apo, 300 f4, 500 f8, 600 f4
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Post Options Post Options   Quote Atom Ant Oz Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2018 at 10:13
Originally posted by pdeley pdeley wrote:

I'm a big fan of the 500 f8 AF Reflex but I honestly can't think of a reason why I would want to modify one to put it on an a77 or a99 (ii or original) body with 24 Mpx sensor.

The typical mirror design's extremely narrow DOF precludes getting the benefits of that much resolution in all but the most ideal conditions, I've used mine mostly with a700 and a450 and even at 12 or 14 Mpx I rarely get to see single-pixel levels of sharpness.

Plus, working with such thin DOF requires a helicoid capable of very precise adjustment = so much turning to go from minimum distance to infinity and back, that it won't be able match the AF speed of a recent dioptric lens, and even on APS-C bodies vignetting is noticeable so on full frame it will be a lot worse.

What with clean v1 specimens of Tamron's 150-600 being available now on the used market for as little as $600, I would think of that as being a more logical target for chip/contact replacing tricks to get full benefit of the a99ii's hybrid AF system (assuming it doesn't work straight out of the box with the body's 399 on-chip phase AF points? ...Or does it?)

The 500/8 has a massive advantage to me compared to the Tamron 150-600 - I already have the 500. There are times when the 500 provides useful reach in a relatively small package. It works well (within its limits) but if additional AF points could be unlocked that would be an interesting bonus.
A99ii + 10-20 | 24-70Z | 24-105D | 70-200G | 100-300 APO D | 70-400G
20/2.8 | 28/2.8 | 35/1.8 | 50/1.4 | 135/2.8 | 300/4 | 500/8
A6500 + 10-18 | 16-70Z | 18-135 | 70-200/4G
28/2 | 50/1.8F | 85/1.8
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Post Options Post Options   Quote pdeley Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2018 at 21:52
Originally posted by Atom Ant Oz Atom Ant Oz wrote:

Originally posted by pdeley pdeley wrote:


What with clean v1 specimens of Tamron's 150-600 being available now on the used market for as little as $600, I would think of that as being a more logical target for chip/contact replacing tricks to get full benefit of the a99ii's hybrid AF system (assuming it doesn't work straight out of the box with the body's 399 on-chip phase AF points? ...Or does it?)


The 500/8 has a massive advantage to me compared to the Tamron 150-600 - I already have the 500. There are times when the 500 provides useful reach in a relatively small package. It works well (within its limits) but if additional AF points could be unlocked that would be an interesting bonus.


No doubt! But we're thinking of replacing contacts (and chip??) here, so anything going wrong means no more AF at all - and potentially no more sensor stabilization either...
a450, a500, a65, a7, 700si & other 35 mm bodies, Sig 15-30, sam 30 2.8 macro, Pentax 40 2.8 pan, Sig 70 f2.8 macro, Vivi 90 f2.8 macro, Mino 100-400 apo, 300 f4, 500 f8, 600 f4
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Post Options Post Options   Quote Atom Ant Oz Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2018 at 22:10
Originally posted by pdeley pdeley wrote:

Originally posted by Atom Ant Oz Atom Ant Oz wrote:

The 500/8 has a massive advantage to me compared to the Tamron 150-600 - I already have the 500. There are times when the 500 provides useful reach in a relatively small package. It works well (within its limits) but if additional AF points could be unlocked that would be an interesting bonus.

No doubt! But we're thinking of replacing contacts (and chip??) here, so anything going wrong means no more AF at all - and potentially no more sensor stabilization either...

You'll notice that I'm not offering to be first in line for the mod. Not even second or third ...
A99ii + 10-20 | 24-70Z | 24-105D | 70-200G | 100-300 APO D | 70-400G
20/2.8 | 28/2.8 | 35/1.8 | 50/1.4 | 135/2.8 | 300/4 | 500/8
A6500 + 10-18 | 16-70Z | 18-135 | 70-200/4G
28/2 | 50/1.8F | 85/1.8
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