Antlia CH4 Methane Filter (1.25″) Overview

The Antlia CH4 Methane filter (1.25″) delivers precision bandpass performance designed to enhance planetary imaging. It excels at capturing finer details and boosting contrast, particularly when imaging gas giants like Jupiter and Saturn.

Methane Absorption Band at 889nm

This filter specifically targets the methane absorption band at 889nm, allowing you to reveal subtle atmospheric features that remain hidden in visible light. By isolating this band, the filter highlights structures and contrasts in methane-rich regions that standard filters cannot detect.

Optimised for Photographic Use Only

The human eye cannot detect light beyond roughly 700nm, making this filter strictly for photographic applications.

• Recommended cameras: Use cameras with strong infrared sensitivity, such as the QHY5II462C, to get the best performance.

• Longer exposures required: Most standard sensors lose sensitivity at these wavelengths, so expect to extend exposure times to capture enough signal.

Advanced Coating Technology for Superior Performance

Antlia applies cutting-edge dielectric interference coatings to ensure high transmission specifically within the methane band.

• Transmission: Strong within the 889nm band.

• Cut-off performance: Blocks other wavelengths sharply with an optical density (OD) of 3.
  This selective transmission improves contrast and isolates planetary methane features, which broader bands fail to capture.

Precision Manufacturing & Parfocal Design

Antlia maintains strict quality control by individually testing each CH4 filter.

• Substrate tolerance: Manufactured with tight tolerances (±0.05mm) to ensure parfocal alignment with other filters.

• Ease of use: You can switch between filters with minimal or no refocusing, streamlining your imaging workflow.

Capture Methane-Rich Planetary Features

Use the Antlia CH4 Methane filter to capture Jupiter’s methane-rich cloud bands, Saturn’s atmospheric layers, and other fine planetary details invisible to the naked eye. This filter provides a powerful tool for astrophotographers seeking to explore the deeper atmospheric structures of the solar system’s giants.

Do not use the CH4 Methane filter for visual observation of the Sun. This filter is strictly for photographic use only

• Never use the CH4 Methane filter for visual observation of the Sun. This filter is strictly for photographic use.

• Always pair the Methane filter with an energy rejection filter when imaging the Sun. Without it, concentrated solar heat can damage your telescope, the CH4 filter, and your imaging equipment.

• Use the Antlia CH4 Methane filter for near-infrared imaging. It passes light centred at 889nm with a narrow 20nm bandpass, enhancing contrast and detail in methane-rich features on planets like Jupiter, Saturn, Mars, and others.

• Avoid using this filter for visual observation. The human eye cannot detect light beyond approximately 700nm, so only infrared-sensitive cameras can capture images through this filter.

Filter Ring:

1.25”( 28.5*0.6 )

Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture

Black Anodized Finish

Laser Engraving No Fading