gschlact wrote:
Ari,
Here is the link where Chuck shares the info. You are absolutely correct that the AF drive voltage plays a part in lens Af speed, However what you neglected is the fact that it is not the battery voltage alone that creates the drive voltage. Circuitry sitting between the two can be used to step-up the voltage for driving af.
Thanks much Guy, however, I can\'t find anywhere that is specifically mentioned the EOS 7D II is as fast as the EOS 1D-X, it only mentions that they are both faster than the EOS 5D III. In the footnote it mentions that list of lenses that allow enhanced servo drive with the EOS 1D-X but there is no mention of the 7D2.
Furthermore servo drive speed with EF extender is not mentioned in this article.
When I attach my 600 II, 300 II or 400 DO II + 2X III to my 1DX the servo drive speed is strikingly faster than the 7D2, I suggest you also try this test.
To clarify this further I will contact Chuck and share his response.
best
Oct 06, 2015 at 07:47 PM
Previous versions of speedmaster20d's message #13231102 « Canon EF 400mm f/4 DO IS II USM Review »
