sshutter: xxx = fix shutter shutter: 0- xxx = variable for fade use 1. sample 0-150 / 150 / 75 = fade use plus two fixed shutter openings 150 and 75 degree to get two shuttertimes 2. sample 0-160 / 160 - 0 =fade use plus fixable shutter in ANY position to get a lot of different shuttertime
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