Red camera lens filters such as this gave Gemini astronauts a means of increasing the contrast in their images. It was part of the selection of equipment available to them for the Maurer 70mm all-purpose camera flown on the later program missions, and may have been used during a color patch experiment on Gemini XI.
NASA transferred this filter to the Museum in 1976.
This object is on display in James S. McDonnell Space Hangar at the Steven F. Udvar-Hazy Center in Chantilly, VA.