Thanks for the tip, so if you change contrast you do not have to change the exposure time, that is convenient!
What about the vibration of the fan? If you put your hand on the housing do you feel a slight vibration?
Best,
Cor
I have the 1200/VLS501 and can confirm that I do not have to change exposure time when I change contrast, and that applies from grade 00 to 5.
I can hear the fan but cannot feel any vibration on the head. Incidentally the fan only runs when the lamp is lit, so is not intrusive.

