Filter Duo-Band ZWO 50,8mm

To limit light pollution, a real plague in visual and even more so for astrophotography, ZWO offers a "2-in-1" filter: the Duo-Band! The idea is simple and consists of combining 2 filtrations: one around the H-Alpha line and the other around the O-III lines. Thanks to multiple layers of high reflectivity treatments, transmission in these 2 characteristic emission peaks of nebulae reaches a minimum of 90%.

This ZWO Duo-Band filter is compatible with APN (after any filtering), CMOS and CCD color cameras (One Shoot Color) which generally have good sensitivity in the O-III and H-Alpha lines. It is an interesting alternative to the combination: "monochrome camera + filter wheel + 3 narrowband filters".

The aluminum cell is manufactured by CNC machines that impose great precision of fabrication. Available in 31.75 and 50.8mm

WARNING: Incident radiation must arrive perpendicularly to the filter, otherwise it will degrade the performance of the filter. The maximum angle must be 8°, so the ZWO Duo-Band filter is not compatible with large and ultra-wide-angle objectives.