Advantages in Asahi Astronomical Filters 1)Optimized interference film design in convergent beam(e.g. F/1.5). This is the great advantage in narrow bandpass filters.
2)Miximum size 380mm diameter with coating uniformity over the clear aperture
3)Great image quality
4)High transmission
5)Actual transmission data available by text file We always wish to cooperate with professional astronomers and contribute to progress the science. When you need the cusom-made filters and you are interested in our products, contact us today.

Johnson, Bessel, and SDSS filters are also available. We have supplied those filters for various astronomical observatories all over the world. We are capable of providing such professional filters.