Player One CH4 8nm 1.25" Methane Band Filter

Overview. The Player One CH4 8nm 1.25" Methane Band Filter is an E-series bandpass filter centered on the 889nm methane absorption band. It isolates the wavelength at which methane in gas-giant atmospheres absorbs strongly, revealing high-altitude cloud and haze structure on Jupiter, Saturn, Uranus, and Neptune that is invisible in ordinary visible-light imaging. The filter is built on a high-quality optical glass substrate with a multi-layer composite coating and threads into standard 1.25" mounts.

Who It's For. This filter suits advanced planetary imagers using sensitive monochrome cameras who want to capture methane-band detail on the giant planets, and researchers or enthusiasts studying atmospheric banding and storm structure.

Key Features & Design.

• 889nm methane band: a center wavelength of 889nm targets the deep methane absorption feature of gas-giant atmospheres.
• 8nm bandwidth: a narrow 8nm passband isolates the band for maximum atmospheric contrast.
• OD4 blocking: deep off-band rejection keeps the recorded signal clean.
• High in-band throughput: approximately 90% peak transmittance helps offset the low light levels of methane-band work.
• Standard 1.25" format: M28.5×0.6 cell fits common 1.25" filter wheels, drawers, and nosepieces.

Optical/Mechanical Design. The filter passes an 8nm band centered at 889nm with OD4 off-band blocking and approximately 90% peak transmittance. The surface is figured to 1/4 lambda and the E-series multi-layer composite coating is applied to a high-quality optical glass substrate 1.85mm thick. The anodized cell uses M28.5×0.6 (1.25") threads and measures 7.5mm overall (5mm body plus 2.5mm thread).

Recommended Uses. Methane-band imaging of Jupiter, Saturn, Uranus, and Neptune to reveal high-altitude cloud, haze, and storm features; long-exposure lucky-imaging sequences with sensitive monochrome planetary cameras.

Compatibility & Accessory Notes. The M28.5×0.6 cell fits standard 1.25" filter wheels, drawers, and nosepieces. Because the methane band is a faint, deep-red/near-infrared feature, the filter is best paired with a sensitive monochrome camera and a telescope of adequate aperture. Long exposures relative to standard RGB planetary work are typical.

Good to Know Before You Order.

• Low light levels: methane-band imaging is photon-starved, so longer exposures and larger apertures give the best results.
• Shipping weight: a packaged weight is not published by the manufacturer; contact us if you need it before ordering.
• Camera type: a sensitive monochrome camera is recommended for methane-band capture.

FAQ.

Is it difficult to set up? No. The filter threads into any standard 1.25" filter wheel, drawer, or nosepiece and needs no adjustment once installed.

What does the methane band show? At 889nm, methane in giant-planet atmospheres absorbs light strongly, so high-altitude clouds and hazes stand out brightly against darker, deeper layers.

Which planets benefit most? Jupiter, Saturn, Uranus, and Neptune all show distinctive methane-band structure not seen in ordinary visible-light imaging.

Bottom Line. A narrow 889nm methane-band filter in the convenient 1.25" format, the Player One CH4 8nm opens up high-contrast atmospheric imaging of the giant planets for dedicated monochrome planetary imagers.