Here are the slides and examples files from today's workshop. Thank you to everyone who attended (or who watches the on-demand recording later).

Hi Chris, this shows that the Vignetting TAN does not rotate field planes.  The manual says it only rotates vignetting.  We still need the ability to cut 2D MTF surfaces along any azimuthal meridion.  This will only become more and more pertinent as freeform surfaces proliferate.

Hi Mike,

The Tangent Angle (TAN) does not rotate the fields. Instead it effectively rotates the coordinate system (or tangent plane) in the pupil. The rotates the axes along which the tangential and sagittal responses are calculated. You can find a full description in this Knowledgebase article. This approach will work for things like the wavefront map/OPD fand and FFT MTF which are computed in pupil space, but not Huygens or Geometric MTF which are computed in image space. Was it the FFT or Huygens MFT you are most interested in?

Chris