SVBONY Telescope Filter H-Alpha 7nm 1.25 inches Filter Narrowband Astronomical Photographic CCD Filter for Deep Sky
Optical high precision double sided polishing to ensure that the parallelism is higher than 30 inch and high flatness 1/4λ.
to ensure that does not affect the image quality.
effectively improve the transmittance and cut off depth.
Ion source assisted coating technology (IAD), to improve the density of the film to ensure that the filter wavelength to minimize the impact of temperature caused by the temperature drift.
High uniformity planetary wheel coating fixture to improve the uniformity of the filter wavelength.
Optical equipment professional fine sandblasting and anode treatment.
the box to do extinction treatment to prevent reflection.