5D3 Microfocus Adjustment

[clifton425]

With the 5D3 having separate MFA's for both the long and short end for each lens, I'm curious as to what the camera does with intermediate focal lengths. Does the camera apply a linear change between the extremes or simply switch from one to the other at some intermediate focal length?

 

[Mt Spokane Photography]

It interpolates the value.
Previously discussed here
http://www.canonrumors.com/forum/index.php?topic=6229.msg117082#msg117082

 

[Loswr]

Correct - a simple integer linear regression between the two values across the focal range of the lens. For the plot below (with the 1D X, but the 5DIII is the same) each lens was set to W = -10 and T = +10.