Tiffen #1 Black and White Viewing Filter BWVF B&H Photo Video
Amazon.com : Kodak Wratten Gelatin Filter 75mm/3x3" Color Compensating CC 30 Yellow : Camera Lens Color Correction And Compensation Filters : Electronics
Lens Black & White Filters profiles Lightroom 7.3 ACR 10.3
Kodak 3 x 3" #90 Dark Gray Amber Wratten 2 Optical Gel 1558170
Kodak Colour Print 'Viewing Filters' - Film and Darkroom User
THE B&W VIEWING FILTER
ZoneView viewing filter – Stearman Press LLC
There Is Only ONE Way To Scout Landscapes: Beginners Questions Forum: Digital Photography Review