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Baader Planetarium Contrast Booster Filter 1.25 inch eyepiece filter in threaded metal ring

Baader Planetarium

Baader Planetarium Contrast Booster Filter 1.25" Eyepieces

SKU CH-88T1-6PSSD

A 1.25" eyepiece filter uses Neodymium glass with a 23-layer dielectric coating to boost contrast and reduce light pollution

  • Enhanced contrast reveals finer planetary detail using Neodymium-doped glass substrate
  • Superior durability from robust 7-layer hard multicoating on rear face
  • Maximum light transmission via 23-layer dielectric long pass blocker on front face
  • Reduces light pollution impact for better urban viewing with specialized filter design
  • Eliminates blue de-focused haze in achromatic refractors for sharper resolution

What It Is

The Baader Planetarium Contrast Booster Filter is a 1.25" eyepiece accessory that uses Neodymium-doped glass to increase contrast on planetary, lunar and deep-sky targets. It suppresses the blue de-focused haze common in achromatic refractors and reduces the impact of urban skyglow. Astronomers seeking sharper detail and more natural colour separation will benefit from the proprietary coating stack.

Before You Order

Confirm that your eyepieces accept standard 1.25" threaded filters so the unit can be screwed directly into the barrel. The filter adds a light yellow tint, which alters the natural colour balance of the view. Observers who require strictly neutral colour rendition for imaging or spectral work should note this shift. No power supply or additional adapters are required for visual use.

In Your Setup

Thread the filter onto the eyepiece before inserting it into the focuser or diagonal; it works with any telescope that accepts 1.25" oculars. The 23-layer dielectric long-pass blocker on the front face and 7-layer anti-reflection coating on the rear face maximise light throughput while rejecting unwanted wavelengths. This combination frees the optics to deliver their full resolution without the veil of scattered blue light.

Highlights

  • Enhanced contrast reveals finer planetary detail using Neodymium-doped glass substrate
  • Superior durability from robust 7-layer hard multicoating on rear face
  • Maximum light transmission via 23-layer dielectric long pass blocker on front face
  • Reduces light pollution impact for better urban viewing with specialized filter design
  • Eliminates blue de-focused haze in achromatic refractors for sharper resolution

Specifications

No published specifications for this item yet.

Questions about this item

What comes in the box with the Baader Contrast Booster Filter and is any extra adapter required for 1.25" eyepieces?

The filter ships ready to thread directly into any 1.25" eyepiece barrel; no additional adapter rings or spacers are needed.

How do I decide whether this Contrast Booster is the right version for my telescope versus other Baader filters?

Choose this model when you want stronger blue-haze rejection and a light yellow tint for planetary and lunar work, rather than the broader bandpass of the Moon & Skyglow or the narrow lines of a UHC filter.

What does the 23-layer dielectric long-pass blocker actually do when the filter is in my focuser?

It transmits the longer visible wavelengths while aggressively blocking defocused blue light, boosting contrast on the Moon and planets and suppressing the violet fringe common in achromatic refractors.

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