Made in Japan Quad BP Filter
Fi-universal 48mm diameter port can be used for most telescopes made in Japan.
Japan's Sightron Japan, published on November 30, 2018, "Quad BP Filter" for the Nebula movie in the city
This product can remove Hα, Hβ, OIII, and SII from the light near the wavelength range (light line) due to the length of the light wave. Therefore, the effect of eliminating light damage is achieved, non-mirror interchangeable lens machine for use as a nebula in the urban area.
Product features *4 ray transmission type only Hα, Hβ, OIII, SII through the near-wavelength region of the 4 ray transmission. Get rid of the effect of paying near light. You can also shoot a nebula in the area of light damage.
*Reliable Japanese products
The IAD multi-layer film is steamed, and the high-precision grinding factory in Japan is responsible for the high density of the film surface and the uniformity of performance.
