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Baader 2" Contrast-Booster Filter # FCB-2 2458365 For Sale

Baader 2

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Baader 2" Contrast-Booster Filter # FCB-2 2458365:

Baader 2" Contrast-Booster Filter # FCB-2 2458365

Description Ordering Info USA Shipping International Orders Returns Our store 1. PRODUCT DESCRIPTION


  • Baader Contrast Booster filter reduces violet fringing around bright objects when viewed achromatic refractors
  • Composed of multi-coated Neodymium glass for superior color balance for visual observation of the moon and planets
  • Superior fine optical substrates for excellent performance, even at high magnifications
  • Hard ion-beam-deposited and scratch-resistant coating for easy, safe cleaning and long life
  • Mounted in spring-loaded optical cell to ensure superior optical performance

Eliminate Violet Fringing While Improving Contrast and Color

Based on the popular Baader Moon&Skyglow filter, the Baader Contrast-Booster delivers a significant enhancement of planetary and lunar contrasts while also eliminating the damaging blue defocused haze present in achromatic refractors. Gone are the annoying blue halo and obscuring haze that surround and smear resolution and contrast. Subtle contrasts and colors are boosted, while displaying the full resolution of your scope.

The Contrast-Booster combines a special proprietary melt of Neodymium glass, made only for Baader Planetarium, with a carefully designed 23 layer dielectric long-pass blocker on one face, and a 7-layer ultra-low antireflection coating on the other face. By aggressively filtering out the defocused blue wavelengths, a light yellow tint is imparted to objects (although noticeably less than a typical yellow filter). The special coatings enable over 95% transmission across key portions of the visible spectrum (including H-Alpha). This results in a filter that retains the colors and color contrasts in challenging subjects like Jupiter, without excessive image dimming. Cloud bands retain their ruddy red hues, but now become more striking in contrast. The Great Red Spot finally becomes easier to observe. Planets and lunarscapes are set against a jet black sky. The Contrast-Booster is a must for Solar observing (when paired with a safe Baader Astro Solar filter).

As many users have found, this is a also great filter for Mars! The views of Mars with all telescopes (including reflectors and apochromats) benefit from the RGB filtration plus blue blocking.

The Contrast Booster filter is primarily intended for visual observation, but when combined with the Baader UV-IR-Cut Filter, the pair makes the ideal filter set for digital imaging. The ¼-wave fine optically polished surfaces guarantee the sharpness and contrast of the image. Filters are available in both 1.25" and 2" sizes.

Superior Optical Quality, Even at High Magnification

At the heart of the Baader filters are their special fine optical substrate polishing process and advanced hard coating design. The result is a filter that imparts virtually no image degradation. Manufacturers of lesser filters, to prevent deterioration from cleaning or exposure to moisture, sometimes resort to sandwiching their delicate coatings between two layers of filter glass, resulting in potential blurred or double images. Unlike these lesser filters, the superior optical quality of Baader filters allows for use at higher magnifications which are particularly useful for studying fine detail, particularly in brighter diffuse and planetary nebulae. Baader filters can take high magnifications, and stars retain their pinpoint sharpness, even if the filter is used far ahead of the image plane when used for astrophotography or when used ahead of a star diagonal or binoviewer. Baader filters fulfill the requirements of an ideal optical filter - to perform at highest efficiency without any other detectable effect on the image.

Advanced Optical Manufacturing for Long Life and Superior Performance

Unlike many budget filters, Baader Planetarium filters are not “biscuit cut” out of larger plates of glass, a process that causes micro-cracks around the filter edges. These cracks can attract moisture between the glass substrate and coating layers via capillary action which causes premature aging and degradation.

By contrast, each Baader filter is individually cut to size (either 1¼", 31mm, 36mm, 2", 50,4mm, 50x50mm, 65x65mm), then polished flat on both sides to a quarter wavelength to ensure maximum image sharpness and distortion over the entire filter, even when the filter is not close to the focal plane. Then each blank is then individually coated with a hard, ion-beam-deposited scratch-resistant coating. However, the coating is not applied all the way to the edge of the substrate to ensure the filter is sealed against the penetration of moisture, even in very humid conditions. This is especially important in multilayer, narrowband filters where moisture can seep in if the coating is not properly deposited. The hard coatings also mean Baader filters are easier and safer to clean without damage.

Baader filters are also tested repeatedly to comply with MIL-specifications. One common process is toboil the test specimenfor one hour in salt water to induced damage. Unlike budget filters cut from larger plates, Baader filters remained completely intact without changes in their transmission characteristics after this rigorous environmental testing.

Baader’s careful engineering and manufacturing mean you need to buy a Baader filter just once and it will last you for a lifetime of astronomical observations.

About Baader Filter Cells

Many filter vendors insert their filter blanks into standard tightly-screwed filter cells. Unfortunately, the stress on the filter can result in drastic deformations of the substrate and degradation in optical performance.

That’s why all Baader filters are no longer tightly fixed but are held spring-loaded in the filter cell. The filter glass may ever so slightly “clatter” in the cell when shaken, but that neither affects the image quality nor results in a displacement in the final image. This “clatter” is not a flaw in the filter cell. It is entirely intentional.


Note: Occasionally, the product you receive might have a slightly different cosmetic appearance or labeling than what is shown. This can often change from batch to batch according to the whims of the manufacturer. However, you will always receive a brand new, original product as described above.

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