Designing and Testing D FA Lenses

[Joseph Tainter]

Having time for my idle brain to get into mischief, I got to 
wondering how Pentax designs and tests the D FA lenses without 
having a full-frame (24 x 36 mm) camera to test them on.
Do they use the two (or so) prototypes of the MZ-D that they 
must still have?

Do they use full-frame Canons with a lens adapter?
Do they have a non-camera setup -- that is, a stationary box 
with a 24 x 36 mm. sensor, shutter, and lens mount? This 
solution seems most likely.
Any thoughts?

Joe