Meade - Series 4000 Narrowband Nebula Filters A great advance for the serious visual observer of emission nebulae. Unlike the wide transmission band characteristics of the Broadband Nebular Filters, Meade Narrowband Filters concentrate 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 greater than 99.9%.The Filter is sold as new condition.
PLEASE REMEMBER THAT THIS FILTER IS THE LARGER ONE THAT CREWS ONTO THE REAR OF MOST SCT'S
PRICED TO SELL AT £85.00
I ALSO ACCEPT PAYPAL AS PAYMENT