The NBZ filter allows the red H-alpha line and the blue-green [O III] lines to pass through and increases contrast. You can obtain narrowband images with just one exposure series.
The NBZ filter supports all telescopes and camera lenses from f/1.9 and lower. This allows you to use the nebulae filters on virtually all common telescopes and most camera lenses.
The bandwidth of 10 nm for H-alpha and 8 nm for [O III] is slightly larger for the NBZ-II than for comparable 7-nm dual-band filters from other manufacturers. This slightly larger bandwidth has the advantage that the filter can also be used on fast optics with similar contrast without any significant loss of transmission. This means you do not need to purchase a special narrowband filter for fast systems, as the NBZ-II is universally applicable. In contrast, some of the competing filters with 7 nm or narrower bandwidth reduce transmission by 50% or more when used in a fast optical system (around f/2).
Made in Japan!
