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Baader Planetarium Baader UHC-L / Ultra-L-Booster Filter 65x65mm
Baader Planetarium Baader UHC-L / Ultra-L-Booster Filter 65x65mm
Baader Planetarium Baader UHC-L / Ultra-L-Booster Filter 65x65mm
Baader Planetarium Baader UHC-L / Ultra-L-Booster Filter 65x65mm

Baader Planetarium Baader UHC-L / Ultra-L-Booster Filter 65x65mm

by Baader Planetarium
SKU BAA-2961566
CA$561.00 - CA$561.00
CA$561.00
CA$561.00 - CA$561.00
CA$561.00
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  • 65x65mm Unmounted Square Format
  • Optimized for LED Light Pollution Rejection
  • High-Contrast Views of Emission Nebulae
  • Ideal Complement to Narrowband OIII Filters
  • Designed for Deep-Sky Observing and Imaging
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader UHC-L / Ultra-L-Booster Filter 65x65mm

    The Baader UHC-L / Ultra-L-Booster Filter is a specialized deep-sky tool in an unmounted 65x65mm format, specifically engineered to reject the blueish skyglow from modern LED streetlights and restore critical contrast on emission nebulae. Acting as the perfect visual complement to restrictive narrowband OIII filters, this 65x65mm filter reveals more structure in objects like the Veil Nebula (NGC 6960) and the Lagoon Nebula (M8).

    Targeting Modern LED Light Pollution

    Unlike traditional light pollution filters designed for the yellow-orange glow of sodium and mercury-vapor lamps, the Baader UHC-L is optimized to combat modern light sources. Its transmission characteristics are tailored to aggressively block the broad-spectrum, blue-rich light emitted by LED streetlights and vehicle headlights, which have become the dominant source of skyglow in many urban and suburban areas.

    Maximizing Contrast on Emission Nebulae

    This filter isolates the most important spectral lines for emission nebulae—Hydrogen-Beta (H-β) and doubly ionized Oxygen (OIII)—while blocking the interfering light between them. The result is a dramatically darkened sky background, causing faint nebular structures to stand out with significantly improved contrast. This makes the UHC-L an essential tool for observing and imaging sprawling HII regions and supernova remnants.

    The UHC-L as a Visual Complement to Narrowband OIII

    While a narrowband OIII filter excels at isolating planetary nebulae, it can suppress the H-Beta component crucial to the structure of other targets, like the Horsehead Nebula (B33). The Baader UHC-L filter passes both emission lines, providing a more complete and often brighter view. It serves as the ideal first-look filter, revealing the full extent of a nebula before you switch to a more restrictive filter for specific details.

    Unmounted 65x65mm Format for Advanced Imaging

    The large 65x65mm unmounted format is designed for serious astrophotographers using large-format sensors and specialized filter holders. This size prevents vignetting on cameras with large diagonals and allows for flexible integration into high-end filter wheels and sliders. Its unmounted design gives you the freedom to install it into the specific holder required by your imaging train.

  • What makes the Baader 65x65mm UHC-L filter different from older light pollution filters?

    The Baader UHC-L filter is specifically designed to combat modern, broad-spectrum LED light pollution, which emits a significant amount of blue light. Older filters were designed for the narrow emission lines of sodium and mercury vapor streetlights and are less effective against the "blueish skyglow" of today's cities.

    When should I use the Baader UHC-L filter instead of a narrowband OIII filter?

    Use the UHC-L filter as your primary nebula filter for a brighter, more complete view of objects that emit strongly in both Oxygen-III and Hydrogen-Beta, such as the Orion Nebula (M42) or Lagoon Nebula (M8). Switch to a more restrictive OIII filter when you want maximum contrast on objects that are almost pure OIII, like most planetary nebulae.

    How will the Baader UHC-L filter improve my view of the Orion Nebula (M42) from a suburban location?

    From a suburban sky, the Baader UHC-L filter will dramatically darken the washed-out background sky, increasing the contrast of the nebula. This will allow you to see fainter outer loops of gas and more intricate detail within the Trapezium region that would otherwise be lost to local light pollution.

    Is the 65x65mm UHC-L filter suitable for visual observing?

    While the 65x65mm UHC-L filter's primary application is for imaging with large-format cameras, it can be used visually if you have a compatible filter holder, such as a 2-inch filter slider that accepts unmounted square filters. For standard eyepiece use, a mounted 2-inch round version is more practical.

    Can I use the Baader 65x65mm UHC-L filter with my large-format camera and fast astrograph for imaging the North American Nebula (NGC 7000)?

    Yes, the 65x65mm format is ideal for this application. It is large enough to fully illuminate the large sensor in your camera without causing vignetting, even with a fast optical system. The filter will enhance the contrast of the nebula's rich hydrogen-alpha and hydrogen-beta regions against the light-polluted sky.

    What does "unmounted" mean for the 65x65mm UHC-L filter?

    "Unmounted" means the 65x65mm UHC-L filter is a square piece of optical glass without a threaded metal cell. You must install it into a compatible filter holder, such as a filter wheel or a filter drawer designed for large, square filters, before it can be placed in the optical path.

  • Baader Planetarium Warranty