IDAS NBZ-II 10 nm Narrowband Nebula Filter O-III, H-Alpha - M54x0.75 connection

IDAS NBZ-II-M48S Dual Band Nebula Filter also for fast Telescopes and Camera Lenses

The NBZ filter is a dual line-pass filter that can be used with one-shot color cameras (DSLR, mirrorless system cameras, color astro cameras) and monochrome cameras. It is the successor to the NBZ/NBZex filters and supports all telescopes and camera lenses from f/1.9 and slower.

The NBZ filter lets the red H-alpha line and the blue-green [O III] lines through and increases the contrast. You get narrow band images with only one exposure series.

The special feature of the NBZ-II filter is that it is also suitable for very fast optics from f/1.9, even with obstruction. This allows you to use the nebula filter 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 competitive 7 nm dual band filters of other makers. This slightly larger bandwidth has the advantage that the filter can also be used on fast optics with similar contrast, without significant loss in transmission. So you don´t have to buy a special narrow band filter for fast systems as the NBZ-II can be used universally. In contrast, some of the competitive 7 nm or narrower filters will decrease in transmittance by 50% or more when used in a fast optical system (around f/2).

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