A-Mount Teleconverters Guide

Yes..all my older lenses work extremely well.

My DGX does work with some motorised lenses, just not the 55-300mm.

I pretty much only use the DGX teleconverters on my 55-300. That combination works on all the bodies I have: Maxxum 50 & 70, A58, A65, A68, A5000 + LA-EA1. My only issue is the focal lengths and apertures not getting corrected.

HILLCLIMBER wrote: I use the same setup (A77Mk2 Sigma 500 f4.5 EX DG and Kenko DGX ) and it works superbly complete with autofocus and there appears to be no noticeable drop in IQ, I had thought of using the matched Sigma 1.4 converter but from Sigma website it looks as if I would loose AF , has anyone else used the matched converter and found if it autofocuses or not?

Is that with centre-point focus, or any point?

QuietOC wrote: I pretty much only use the DGX teleconverters on my 55-300. That combination works on all the bodies I have: Maxxum 50 & 70, A58, A65, A68, A5000 + LA-EA1. My only issue is the focal lengths and apertures not getting corrected.

The issue seems to be the DGX teleconverters don't support the latest A-mount communication speed. This faster communication speed is the main change in the SSM II lenses, and it also allows 10 FPS tracking with the A9/LA-EA3.

The list of lenses that support 10 FPS tracking on the A9 is likely also the list of lenses not fully compatible with the DGX teleconverters:

SAL1635Z2     Vario-Sonnar T* 16-35mm F2.8 ZA SSM II
SAL1650     DT 16-50mm F2.8 SSM
SAL18135     DT 18-135mm F3.5-5.6 SAM
SAL2470Z2     Vario-Sonnar T* 24-70mm F2.8 ZA SSM II
SAL50F14Z     Planar T* 50mm F1.4 ZA SSM
SAL55300     DT 55-300mm F4.5-5.6 SAM
SAL70200G2     70-200mm F2.8 G SSM II
SAL70300G2     70-300mm F4.5-5.6 G SSM II
SAL70400G2     70-400mm F4-5.6 G SSM II
SAL300F28G2     300mm F2.8 G SSM II
SAL500F40G     500mm F4 G SSM

All three of my lenses on this list do not get their aperture and focal length corrected by the DGX teleconverters on current Sony A-mount cameras (A65, A58, A68 for me.) The DGX teleconverters do correct them on Minolta bodies and on the LA-EA1 which was released a year before the oldest lens in the list--the SAL1650 in 2011. Probably the pre-2011 Sony A-mount bodies also don't support the faster communication speed.

It would be nice if there was a way to force the use of the slower protocol when using the DGX teleconverters. When I first tried the SAL1650 on a 1.4X DGX on the A68 this morning it seemed to be getting adjusted (F4 was the minimum), but remounting it made it revert. I'll investigate this further.

Edited by QuietOC - 18 May 2018 at 22:50

Can we actually hack an LAEA1 to use on an A9?

Mark_k wrote: Miranda F wrote: My DGX does work with some motorised lenses, just not the 55-300mm. Here you go

I recently bought the Kenko 1.4x MC4 DGX for 100€ on ebay (identical to the one in the photo, 8 contacts), hoping that it will work with my Tamron SP 2.8/70-200mm but it doesn't

Dosn't work means, AF doesn't work and the aperture is only displayed as F--.
For the lenses that worked fine, AF worked well, the corrected aperture is displyed and the EXIF contained correct information, e.g. 1.4/30mm became 2.0/45mm.

So I checked all my lenses to see which one works and which don't work.

"screwdrive" AF:
Minolta 3.5-3-5/24-85mm     works
Sigma 4.5-5.6/75-300mm APO works
Tamron 4.5-5.6/80-210mm     works
Minolta 1.7/50mm            works

Lenses with own AF drive (HSM/USM/SSM)
Sigma 1.4/30mm DC HSM Art   works
Sigma 3.5/10-20mm           doesn't work
Tamron SP2.8/70-200mm       doesn't work
Sony DT3.5-5.6/18-55mm      doesn't work


The ebay seller has a 30 day return policy and agreed to take it back.