Intermediate phototube S, right 50:50/0:100/100:0

Intermediate phototube S, right 50:50/0:100/100:0 provides together with binocular tube S in stereo mode:
- stereo observation by 50% of brightness and 50% from right channel to camera simultaneously or
- 100% from right channel to camera and 100% from left channel to left eye or
- 0% to camera and stereo observation by 100% of brightness