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A-Mount Teleconverters Guide

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amrep View Drop Down
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Post Options Post Options   Quote amrep Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2019 at 13:17
My Kenko 1.4x MC4 DGX will AF nicely with my Tamron SP 70-200 2.8 (A009) as well as with the 90mm macro (F004) on different A-mount bodies. AF also partly works on the Tamron 160-600 (A011) - up to about the 300mm zoom setting.

All these lenses have their own USD motors.

If it doesn't work for you, it may be because of some still unrecognized defect in your equipment. Could be either the 1.4x DGX or the camera.
 



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Post Options Post Options   Quote Nordlicht Quote  Post ReplyReply Direct Link To This Post Posted: 07 April 2019 at 10:02
Thanks for the feedback, amrep.

Good to know that the MC4 works fine with with the Tamron lens. A camera defect is unlikely, because I tested it with my old A55, my own A77II and another A77II, same problem on all 3. But there seems to be indeed something wrong as I noticed yesterday some of the buttons behave not as expected when the adaptor is on the camera. So it might indeed be a defect in the adaptor.
But based on your feedback, I will try another one when I find one.
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 08 April 2019 at 11:22
I think Kenko had trouble with the Sony comms protocol because they deleted all A-mount TCs from their sales list. on the older ones, WYGIWYG!
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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amrep View Drop Down
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Post Options Post Options   Quote amrep Quote  Post ReplyReply Direct Link To This Post Posted: 08 April 2019 at 13:18
Originally posted by Miranda F Miranda F wrote:

I think Kenko had trouble with the Sony comms protocol because they deleted all A-mount TCs from their sales list. on the older ones, WYGIWYG!
In my opinion that's an unfounded speculation. The Kenko TC's generally works well on all Sony A-mount bodies.

Low A-mount sales volumes seems like a much more likely explanation.
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 09 April 2019 at 15:29
Originally posted by amrep amrep wrote:

Originally posted by Miranda F Miranda F wrote:

I think Kenko had trouble with the Sony comms protocol because they deleted all A-mount TCs from their sales list. on the older ones, WYGIWYG!
In my opinion that's an unfounded speculation. The Kenko TC's generally works well on all Sony A-mount bodies.

Given how many iterations they had of their TC hardware and firmware and how every version has compatibility issues with some lenses, I'd say it was well-founded speculation; but I agree that sales volume was likely to be a contributory factor.
And I'd argue with 'generally'. The later TCs work well on most older lenses but whichever one you pick (especially if you pick one up s/h without much provenance) you are likely to find issues with some lens or other.
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 09 April 2019 at 17:58
It is nice that the Kenko DGX teleconverters work as well as they do with the post-A77 cameras and lenses. They work much better than a pre-A77 Sigma HSM lenses.

Maybe there's too much backwards compatibility with A-mount. There are good reasons for Sony to ditch the in-body focus drive and mechanical aperture coupling.

Edited by QuietOC - 09 April 2019 at 18:05
Sony A7III NEX-5T HVL-F45RM LA-EA3 LA-EA4 MB-IV MC-11 EF-E II 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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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 12 April 2019 at 14:01
Yes, I agree.
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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Post Options Post Options   Quote pbcbob Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2019 at 20:24
I am sure this has already been answered.
In the introduction to teleconverters it states that the minimum aperture to enable auto-focus is 6.3. It then gives an example that a 2X teleconverter will work on an F4 lens. Two f stops would make it F8 which is too small. I just tried the Minolta 2X teleconverter on my 300mm F4 and it will not auto-focus.
Comments appreciated. I sure hope I am not misreading the narrative.
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Post Options Post Options   Quote pbcbob Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2019 at 20:28
I did misread. Please disregard.   It was showing that an F2 would become f4 which is a larger stop than 6.3.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2019 at 20:49
Some generic converters don't tell the camera their there , so the camera continues to have a go at auto focusing .
In good light they can still work .

I have a Minolta 2x teleconverter whose ribbon cable snapped while I had it apart to clean out the lenses .
To get it working again I got a replacement chip from James Lao and replaced the converters contacts with that .
The chip I got was programmed to report itself as a 600mm f/4 lens so image stabilization works correctly with my Minolta 300mm f/4 , and aperture works .

You can see my conversion here ; https://www.dpreview.com/forums/post/60010907

Of coarse as the lens is an f/4 lens , with a 2x teleconverter on your still using an f/8 lens . The light has to be good and the target must have good definition for A/F to work .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2019 at 20:51
Originally posted by pbcbob pbcbob wrote:

I am sure this has already been answered.
In the introduction to teleconverters it states that the minimum aperture to enable auto-focus is 6.3. It then gives an example that a 2X teleconverter will work on an F4 lens. Two f stops would make it F8 which is too small. I just tried the Minolta 2X teleconverter on my 300mm F4 and it will not auto-focus.
Comments appreciated. I sure hope I am not misreading the narrative.

That part of the guide here is inaccurate. There's no definite limit. Sony (and Minolta) arbitrarily disable AF with their teleconverters, but the Kenko teleconverters don't do that. The AF sensors still work a bit beyond an effective f/11. Most of the points have effective apertures around f/5.6, so performance degrades at smaller apertures, but they work pretty well at f/8 still.

Contrary to poster above me the chipped Kenko teleconverters report the effective aperture, in fact they report a slightly smaller effective aperture than the actual one. The reported effective aperture is not used by the camera to turn off the AF system.

Even old Kenko 5-pin 2X chipped teleconverters allow AF with F4 lenses on Minolta film cameras.

I do have a Kenko DG teleconverter that just passes through the lens communications and AF works worse with it, than with the chipped teleconverters.

Edited by QuietOC - 28 April 2019 at 21:08
Sony A7III NEX-5T HVL-F45RM LA-EA3 LA-EA4 MB-IV MC-11 EF-E II 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 Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2020 at 01:21
I have a Teleplus 1.6x M-AF teleconverter that does not seem to be mentioned in this thread.

It's a 5-pin, screw drive converter in what appears to be the same body as the 1.4x. Reports the FL corrected for 1.4x ...

But it does have 1.6x printed on it.

Performance is exemplary - if you want something to magnify the focal length while massively softening the image and adding CA.

I must do a comparison with the 1.4x to see if there is actually any difference in magnification. Though I don't remember the 1.4x being quite so bad IQwise.
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Post Options Post Options   Quote ronaldc5 Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2020 at 15:52
Samyang 24mm Tilt Shift A-mount fits & operates on Minolta/Sony TC14 and TC20.
Since there is only one TS lens available for A-mount this helps you to create different focal lengths.
As usual the TC20 degrades image quality more than the TC14 but it works both in tilt as in shift mode.
Works on both A99 and A99II, will probably work on APS-C also.
The Samyang is fully manual lens so differences in type 1, type 2 and Sony brand for gearing, D-chip and SSM support are irrelevant, they all work the alike.
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