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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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Nordlicht View Drop Down
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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, 5d, 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, 5d, 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 A68 A77II A6000 A7II LA-EA3 LA-EA4 MC-11
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8
 



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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, 5d, 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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