The ZWO Duo-Band Narrowband Filter (2") is an affordable solution for those who want to photograph emission nebulae from light-polluted urban environments.
The filter transmits light in two narrow wavelength ranges while blocking the rest of the spectrum. The characteristics of the two passbands are as follows:
- 15 nm bandwidth and 80% transmission in the Hα (656.3 nm) range
- 35 nm bandwidth and 90% transmission in the OIII (500.7 nm) range
The ZWO Duo-Band Narrowband Filter was designed primarily for ZWO colour cameras, but it also performs exceptionally well with cameras from other manufacturers. The excellent material quality and precision machining that characterise the manufacturer are also evident in this product.