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Baader Planetarium Yellow 495nm Long-Pass Filter, 1.25" Eyepiece

SKU: AA2458301 MFR: FCFY-1
$60.00
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Key Features

  • Enhance planetary views with this Baader Planetarium 1.25" yellow filter!
  • Boost contrast on Jupiter & Saturn using this premium telescope filter.
  • This yellow filter effectively reduces unwanted blue light transmission.
  • Threaded for standard 1.25" eyepieces, ensuring a secure, snug fit.
  • Durable build of this Baader Planetarium filter protects delicate optics.
  • Minimize light pollution and see fainter details with this filter!
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Special Order?Estimated to Ship: 08/19/2025
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Review Summary

2021-01-19T11:09:16

Rated 5 out of 5

Best in quality

As always super quality just need more clear nights

PHILLIP K.

2016-08-23T21:09:28

Rated 5 out of 5

must have filter for any acromat refractor owner

must have filter for any acromat refractor owner. kills purple halo better than the more expensive fringe killer, I even use it with my reflectors to sharpen planetary detail...light yellow tinge is not offensive, as with some of my cheap yellow filters, which appear artificial.

mike c.

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Baader Planetarium FCFY-1 Specifications

  • Glass Thickness

    2mm / 0.07"

  • Eyepiece

    1.25" / 31.75mm

  • UPC Code

    4047825009814

About Baader Planetarium FCFY-1

FEATURED REVIEWS

must have filter for any acromat refractor owner

By mike c.

must have filter for any acromat refractor owner. kills purple halo better than the more expensive fringe killer, I even use it with my reflectors to sharpen planetary detail...light yellow tinge is not offensive, as with some of my cheap yellow filters, which appear artificial.

Best in quality

By PHILLIP K.

As always super quality just need more clear nights

The Baader Planetarium FCFY-1 Yellow 495 nm Long-Pass Filter has 98% transmission efficiency and is superb for bright planet and cometary details. A fine optical polish and 2 mm thick glass allow this filter to be inserted anywhere into the optical path without introducing astigmatism or other defects. For instance, they can be used in front of a binocular viewer without degrading the image in any way. Substrates are free of striae and plane-parallel polished to within 30 seconds of arc. This eliminates any double images or ghosting due to wedge errors in the glass.

The filter cell features the largest clear aperture of any telescope filter on the market for complete freedom from vignetting at any focal length. The front "crown" incorporates milled notches, which makes handling and threading the filter an easy operation in the dark. All surfaces are treated with a 7-layer multi-coating, featuring a mere 0.25% residual reflection.

It is the most elaborate coating ever applied onto amateur color filters, resulting in a filter free of any false reflections under any incident angle of light. Light is the hottest commodity for all planetary observation. Especially during high magnification work, whether you have enough light or not is the deciding factor for the recognition of the subtlest planetary surface detail, much more important than a horde of different filters of mediocre execution. The 7-layer MC-coatings not only provide a brighter image, they prevent the softening effect of scattered light. Scattered light kills exactly those subtle features in planetary detail that you are longing to see. Painstaking attention to coatings and perfect optical figuring are simple reasons why the image contrast through these premium filters is so rock-solid.

Baader Planetarium FCFY-1 Features

  • Freedom from ghost images, even when stacked
  • The Baader Planetarium Yellow Long-Pass Filter has 98% transmission efficiency and is superb for bright planet and cometary details
  • Can be placed anywhere in the optical path without introducing astigmatism or other defects
  • Striae-free substrates are polished parallel to within 30 seconds of arc to avoid wedge errors
  • Finest 7-layer hard multi-coatings on both faces feature 0.25% residual reflections
  • Extremely high transmission results in maximum contrast and isolation of planetary details, even with smaller telescopes
  • Efficiency of the long-pass filter (Yellow) peaks at 98%
  • Carefully designed spectral characteristics. Filters may be stacked without image degradation or ghosting in order to provide even narrower passbands, or combine with any of the other Baader filters for interesting possibilities
  • No reduction in sharpness, even at high magnifications or when using the filter far ahead of the focal plane
  • With the 2" size, only one filter is needed for binoviewing. Only Baader colored filters have the optical quality necessary for use this far ahead of the focal plane

Warranty Information

This product has a limited warranty of 24 months for parts and 24 months for labor.

Key Features

  • Enhance planetary views with this Baader Planetarium 1.25" yellow filter!
  • Boost contrast on Jupiter & Saturn using this premium telescope filter.
  • This yellow filter effectively reduces unwanted blue light transmission.
  • Threaded for standard 1.25" eyepieces, ensuring a secure, snug fit.
  • Durable build of this Baader Planetarium filter protects delicate optics.
  • Minimize light pollution and see fainter details with this filter!