SPLITGRADE®
This unique system facilitates and accelerates the making of high-quality black-and-white photographs on multigrade paper.
First of all, by measuring areas of light and shadow of the projected negative, the user determines contrast and brightness on the easel.
For over 30 default paper calibrations, a first suggestion for the right exposure will immediately be calculated with 1/10 f-stop / gradation level accuracy.
Via the unique filter control with shutter function, these measurements will automatically be transformed into a split exposure.
Furthermore, there is no limit to any possible manual corrections and post-exposure. Image results are developed much faster and creative working is encouraged, instead of limited.
Here is a link to an interesting article by Christopher Osborne in the online section of SilverGrain Classics