The IDAS Narrow Band Nebula Photo-Visual (NBN-PV) filter is a new filter design using the IDAS-unique Multi-Bandpass Technology (MBT). This allows the creation of a filter with very narrow passbands around both the H-Beta / O III emission lines, and the H-alpha / N II / S II emission line groups. This combines the high contrast views of narrowband filters with the convenience (and economy) of covering all of the important nebula emission lines in a single filter. The resulting filter is great for visual use or monochrome imaging of emission nebulae.
This 31.7mm filter fits standard 1.25" filter threads. The filter is in new condition and has never been installed or cleaned, and the glass surface has never been touched. Note that the spectrum below is a representative sample and not from this specific filter. The photo of the filter is from Hutech's Web site and also not of this specific filter.
Please e-mail with questions.
- Adam Forrest Block