The NBZ filter transmits the red H-alpha line and the blue-green [O III] lines, thereby increasing contrast. You can obtain narrow-band images with just a single exposure series.
The NBZ filter is compatible with all telescopes and camera lenses from f/1.4 and slower. This means you can use the nebulae filters on virtually all standard telescopes and most camera lenses.
The bandwidth of 10 nm for H-alpha and 8 nm for [O III] on the NBZ-II is slightly wider than that of comparable 7-nm dual-band filters from other manufacturers. This slightly wider bandwidth has the advantage that the filter can also be used on fast optics with similar contrast without resulting in a significant loss of transmission. You therefore do not need to purchase a special narrow-band filter for fast systems, as the NBZ-II is universally applicable. In contrast, some competing filters with a 7 nm or narrower bandwidth reduce transmission by 50% or more when used in a fast optical system (around f/2).
Made in Japan!
