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Kenko R1(R60) and R64 filters are widely used in Japan
as "H-alpha" filters for monochrome CCD and
emulsion imaging (usually with Kodak Tech Pan).
The red passband emphasizes H-alpha emission
nebulae, reduces sky-glow, and sharpens the
performance of lenses which may not bring all
colors to perfect focus at the same point.
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Kenko R1(R60) and R64 filters come in the following sizes:
48mm, 52mm, 72mm, 77mm and 82mm.
Filter thickness is 2.5mm.
WARNING: These filters are not suitable
for solar viewing or photography.
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