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.