| sshutter: xxx  = fix shuttershutter: 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
 |