Used - 1.25" Series 4000 Nebular-Narrowband Filter
This item is out of stock but you can place an order now and we’ll ship when it becomes available.
This is in great condition.
Unlike the wide transmission band characteristics of the Broadband Nebular Filters, Meade Narrowband Filters zero in on the three most important visible wavelengths emitted by deep-space emission nebulae: the two spectral lines of Oxygen III at 496 and 501nm and the Hydrogen Beta line at 486nm. Virtually all unwanted city light emissions are rejected by factors of 99.9+%.