Asahi Spectra can now supply next-generation large, over 600mm diameter broad bandpass (ugrizy) filter. Also, we will be able to make large narrow bandpass filter as well by the end of this year. We can also provide IR filter with durability against cryogenic atmosphere by using sputtering technology. Dichroic mirror with wide reflection/transmission range, steep slope and good surface quality for optical or IR wavelength is available.

We introduce the following items.

• Large filters
• IR filters
• Dicroic mirror
• Johnson / Bessel filters
• Asahi astronomical filters
• SDSS filters
• Narrow bandpass filters