|Mars - Stack of 2000 images obtained with a CH4 Filter at Prime Focus with a Meade 14" LX-850 scope and ZWO 1600 Camera|
I believe the features are real and not processing artifacts. The features are seen in the original stacked image. Likewise, I could see them as I captured the original video. Unfortunately, the video is in .SER format and cannot be displayed here.
Mars' atmosphere contains virtually no methane - only "Florida Air" sent aboard the current rovers. So, the images cannot be recording methane features in the Martian atmosphere. Likewise, the features do not correspond to markings on the surface, so the CH4 filter is not seeing through the dusty atmosphere.
The only possibility I can think of is the CH4 filter is reveling some property of the different dust clouds encircling the planet.
A quick Internet search finds no images of Mars using a CH4 filter. I find it hard to believe the no other neophyte astrophotographer is pointing their CH4 Filter-equipped telescope at The Red Planet.
Using the CH4 filter as the luminosity chancel and throwing in a red, green and blue image gives a strange result.
Tonight, I will attempt to duplicate the observation.