This Subtractive Calculator Kit by Beseler is a must-have for any photography enthusiast. It is compatible with color film and has a variety of features including a grey scale, diffuser/lens clamp, and subtractive color calculator.

The brand behind this processing equipment is Beseler, a trusted name in the photography industry. This Subtracting Calculator Kit is perfect for darkroom and developing work. With its advanced features and compatibility with color film, it's an excellent addition to any photographer's toolkit.