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Meade Series 4000 Narrowband Meade Nebular Filters: A remarkable advance for the serious visual observer of emission nebulae. Meade Narrowband Filters (#908 N and # 911 N) 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...

Sales Price: $ 119.95