3-Insert Film Holder Into Scanner (MA-21-M):. Carefully align arrow with front of MA-21-M as shown. Push in to next number for frame 2, 3, 4 ...
Explains the purpose of stacking teleconverters and how to calculating focal length, aperture, and aperture diameter.
It's a visible light filter, not a IR filter. The IR filter is removed inside the Sony camcorder when they switched it to NightShot mode. I don't know if it ...