Quote Originally Posted by jaydub View Post
...I checked out the manual and did not pick up on anything that would seem to dispel, clarify or correct my suspicions about the retracting half-dome.
L-758 manual (English) page 13:

4. Basic Operation
.. 3. Incident Measurement Mode
"3. When the Lumisphere is retracted (flat diffuser function)
This is used to measure manuscripts, paintings or other flat copy."

Not exactly hidden or encrypted.

- Leigh