Amazon.com : Kodak Wratten Gelatin Filter 75mm/3x3" Color Compensating CC 30 Yellow : Camera Lens Color Correction And Compensation Filters : Electronics
Kodak 3 x 3" #90 Dark Gray Amber Wratten 2 Optical Gel 1558170
ZoneView viewing filter – Stearman Press LLC
Lens Black & White Filters profiles Lightroom 7.3 ACR 10.3
Twilight of the viewing filter | The Machine Planet
What's a wratten filter? Do I need one? Which wratten filter do I need to make Mars look better? How about Jupiter? Find out!