Print calculator

This small printing assistant lets you know quickly and easily what the correct exposure time for your print is. Just set up your print, lay the print calculator on top of the paper, and expose for 60 seconds at your working f-stop. The print calculator is circular, with wedges of increasingly dense gray - so when the print is developed, you will have a circular area with light- to dark segments. Choose the segment which is properly exposed, and that will tell you the exposure time for your print. Size: 4x5 Inch.