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OPTOLONG 1.25inch 18nm O-III Filter for Telescope Eyepiece Cuts Light Pollution
OPTOLONG 1.25inch 18nm O-III Filter for Telescope Eyepiece Cuts Light Pollution
OPTOLONG 1.25inch 18nm O-III Filter for Telescope Eyepiece Cuts Light Pollution
OPTOLONG 1.25inch 18nm O-III Filter for Telescope Eyepiece Cuts Light Pollution
OPTOLONG 1.25inch 18nm O-III Filter for Telescope Eyepiece Cuts Light Pollution

OPTOLONG 1.25inch 18nm O-III Filter for Telescope Eyepiece Cuts Light Pollution

$ 41.18

Availability: 100 in stock
  • Refund will be given as: Money Back
  • Compatible Brand: Universal
  • All returns accepted: Returns Accepted
  • Item must be returned within: 30 Days
  • Country/Region of Manufacture: China
  • Condition: New
  • Brand: Optolong
  • Return shipping will be paid by: Buyer
  • Restocking Fee: No
  • Type: Filter
  • MPN: Does Not Apply

    Description

    OPTOLONG 1.25" 18nm O-III Filter for Telescope 1.25 inch Eyepiece Cuts Light Pollution
    Feature:
    Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
    Surface quality, according to MIL-O-13830, is 60/40
    90% transmission at 495.9nm and 500.7nm
    0.1% transmission Hg at 435nm and 578nm
    0.1% transmission Na at 589nm
    High value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedure
    Thin metal cells have a clear aperture of 26mm for 1.25" filters
    Each filter comes with a plastic case with high pressure EVA case lining
    Package Includes:
    1.25" OPTOLONG OIII 18nm Telescope filter