The Link Observatory
10-inch photographic refractor is designed to use 8x10 inch glass plates.Inexpensive sheet film can be used by
holding the film flat behind a sheet of clear glass in the plateholder.Experiments with panchromatic film and
yellow or red filters were not very satisfactory, due to the blue-corrected
objective's steep focal gradient at longer wavelengths.However, blue-sensitive Kodak SB-5
X-ray film produces excellent images.