ZWO METHANE FILTER 1.25"

The ZWO methane (CH4) filter is specifically designed for high resolution astrophotography of planets. 

Jupiter and Saturn can reveal details of their atmosphere at this wavelength. The bandpass is only 20nm and it is in the infrared spectrum. It should only be used with large telescopes (above 25cm in diameter) and monochrome cameras with a guide sensitivity in the IR spectrum.