Antlia Methane CH4 Imaging Filter - 1.25"

The Methane (CH4) filter is recommended for planetary imaging of objects like Mars, Jupiter, Saturn and the other planets.

In order to produce good results, you are likely to require relatively longer exposures times and larger aperture telescope with this filter than with other filters.

Application and Performance:

• Schott optical substrate
• 1.25” mounted, (2mm+/-0.05mm)
• Surface Quality: 60/40 (Refer to MIL-O-13830)
• 2 sides fine-optically polished to ensure accurate 1/4 wavefront
• 30 arcsec parallelism

Filter Ring:

• 1.25” Mounted (M28.5*0.6 thread)
• Ultra-thin filter cell to minimize vignetting by maximizing possible clear aperture
• Black Anodized Finish
• Laser Engraving, No Fading

Not Recommended:

• Solar Observing and imaging
• Visual observation
• DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.

Antlia methane (CH4) filter is a specialized filter that allows light in the near infrared portion of the spectrum centered at 889nm to pass through with a bandpass that is 20nm wide. This filter was developed in order to measure finer details and more contrast of the methane that is characteristic of Jupiter, Mars, Saturn and other planets. The human eye is not sensitive to light beyond about 700nm hence no person can see what is transmitted by this filter, so this filter is not suitable for visual applications.