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Black 2-inch telescope filter with threaded metal ring and coated glass

Celestron

Celestron 94124 2-Inch UHC/LPR Filter

SKU CH-RJJT-ZRVZ5

A 2-inch UHC/LPR telescope filter that blocks artificial and natural light-pollution wavelengths while transmitting over 97% of the bandpass for darker skies and improved nebula contrast

  • TypeTelescopes
  • ColorBlack
  • FeaturesThe new ultra high contrast 2 Inch UHC/LPR filter has improv
  • Enhanced nebula contrast from selective wavelength filtering
  • Over 97% transmission across the full bandpass
  • Blocks mercury and sodium vapor light pollution
  • Reduces natural sky glow from oxygen emission
  • Compatible with wide range of telescopes and cameras

Purpose and users

The Celestron 94124 2-Inch UHC/LPR filter is made for astronomers who photograph or visually observe emission nebulae from light-polluted or dark-sky sites. It selectively blocks mercury, sodium and sky-glow wavelengths while passing the key nebular lines.

Build and fit

The black anodised housing uses advanced coatings that deliver over 97 percent transmission across the bandpass with total blockage of prominent pollution lines. Standard 2-inch threads allow direct attachment to compatible telescopes, diagonals, camera adapters and eyepieces without additional spacers.

Deciding specification

Transmission exceeds 97 percent across the full bandpass while completely rejecting the strongest artificial and atmospheric emission lines. Buyers who need a narrower bandpass for planetary work or a broader pass for galaxy imaging should choose a different filter type.

Highlights

  • Enhanced nebula contrast from selective wavelength filtering
  • Over 97% transmission across the full bandpass
  • Blocks mercury and sodium vapor light pollution
  • Reduces natural sky glow from oxygen emission
  • Compatible with wide range of telescopes and cameras

Specifications

BrandCELESTRON
TypeTelescopes
ColorBlack
FeaturesThe new ultra high contrast 2 Inch UHC/LPR filter has improved contrast over the typical broadband filters. It is designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light.. The multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching. These advanced technology coatings enable the filter to achieve an outstanding transmission of over 97...

Questions about this item

What wavelengths does the Celestron 94124 UHC/LPR filter block?

It selectively reduces transmission of mercury vapor, high and low-pressure sodium vapor lines, and neutral oxygen emission that causes sky glow.

What thread size does the 94124 filter need to mount?

The filter is built for standard 2-inch filter threads on eyepieces, diagonals and camera adapters.

How is the 94124 filter installed and what step is often missed?

Screw it into the 2-inch barrel of your eyepiece, diagonal or camera adapter; the common mistake is forgetting to remove any protective caps before threading it on.

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