STC Astro Duo-Narrowband Filter

STC Astro Duo-Narrowband Filter ( 48mm )

STC Astro Duo-Narrowband Filter is the world's first filter to simultaneously capture Ha (red) and OIII (blue-green) high-penetration narrow-band spectra, while suppressing more light pollution and other long waves, making astronomical photography images The details and contrast in the image are more obvious, and the high-efficiency light pollution filter that takes half the exposure time is saved. Paired with modern astronomical shooting equipment that is becoming easier to operate, you can capture deep-sky objects such as emission nebulae directly on your home roof, open space playground and other heavy light pollution areas in the city center, quickly grasp the right time and place, and easily obtain high-quality images.

● Suitable for use in heavy light pollution environments (Bortle scale 3~9).
● 7nm narrow-band precise spectral positioning process, achieving high penetration of more than 85% photons.
● Suitable for cooling CCD digital cameras. Generally, single-lens cameras can be used without modification, and the modification effect will be better.
● Made of glass with strict requirements for ultra-high surface flatness and parfocality, the image of the scene is still clear and not blurry on the 8K high-pixel and astronomical 1200mm high-magnification telescope.
● The outer edge of the lens glass is blackened with carbon ink to reduce flare and ghosting.
● The surface of the aluminum ring is treated with non-stick Teflon and black matte to eliminate reflection, making it non-slip and easy to disassemble.