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天文窄带滤光片ASAHI SPECTRA 

Astronomical Narrow bandpass filters

Narrow bandpass filters for emission lines in the night sky such as H-alpha, SII, H-beta, or OIII are basic and necessary for
most of escopes.
Recently narrow bandpass filters for galaxy redshift survey (e.g. redshifted H-alpha emission) have been required by
many science groups.

Narrow bandpass filter that meets the following performances will contribute to your survey and science.

a. Small error for the target CWL and FWHM
b. Rectangular shape of passband
c. High transmission in passband

Actual transmission curve of past narrow bandpass filter was often significantly different from the theoretical design, and
made astronomers disappointed.
However, Asahi is now successful to improve the gap between ideal and reality.

天文窄带滤光片ASAHI SPECTRA