Notice about 18-400mm F/3.5-6.3 Di II VC HLD (Model B028) operation


Notice about 18-400mm F/3.5-6.3 Di II VC HLD (Model B028) operation

Dear Tamron product users and potential purchasers.

Thank you for your interest in Tamron products.

We would like to announce that following symptom was found when using our 18-400mm F/3.5-6.3 Di II VC HLD (Model B028) lens on Canon EOS R7/ EOS R10 used with Canon “Mount Adapter EF-EOS-R”.


Depending on the timing of camera power on/off, AF may not operate properly when the shutter release button is pressed halfway.

How to recover

Turn off the camera, remove and re-attach the lens, and then turn on the camera again.

We will continue to work on updating the firmware to match the mentioned cameras with affected lenses. Please watch for further announcement on updated firmware.

We sincerely apologize to all users and potential purchasers for any inconvenience this issue may cause

Share this article:

Tamron products mentioned in this article

18-400mm F/3.5-6.3 Di II VC HLD

Modell B028

Speilløs med adapter Di II
misligholde, Bred, Tele
Reise, Mennesker, Landskap


TAMRON Lens Utility

TAMRON Lens Utility

Individual configuration with the TAMRON Lens Utility Software



Find instructions, technical data and catalogs.



Our support will help you with your concerns.