The TC will work on older bodies, incl bodies with SR that are not in this list, since it has been confirmed that the TC recalculates the focal length/aperture without the firmware upgrade. It seems the TC will manipulate all data coming from the lens chip and make sure the body sees adapted values only. So as long as the body functions using these data don't need to know the specific lens, the bodies will work just fine with the data as such.
Question is why the firmware needs upgrading, and whether that reason makes any sense for older bodies to begin with. I think it's needed to match the TC's ID to new entries in the in-camera database for functions that use this database.
For argument's sake, imagine that the firmware upgrade is only needed to allow for lens corrections to take into account the 1.4x factor when applying the corrections for the mounted lens. These corrections are stored in the firmware, not in the lens. In that case there would be no need to upgrade the firmware for older bodies that did not yet have lens corrections to begin with... so why bother offering a firmware upgrade for these?
What other functions would need the ID specifically?
Wim
---------- Post added 03-07-2014 at 05:09 PM ----------
Originally posted by MadMathMind Some of the older bodies may not support the TC. Think SDM and pre-2007 bodies.
The TC is both screw drive and SDM. On older non-SDM/DC supporting bodies DA* lenses that have SDM and screw drive will use screw drive, so the same will be the case for this TC. On SDM/DC supporting bodies, the TC will use the powerzoom contacts for SDM/DC lenses.
Regardless, I expect the TC to work on all bodies.
Wim