My picture of Mars, earlier this week, is made using my ASI224MC camera. The ASI224MC, is a color camera with some good respons in the near infrared. As I did not use an IR/UV blocker the picture is an IR picture polluted with visual light -see also article "why you should use an IR cut filter with a color camera". The color of my Mars picture is reddish/pink which is not a realistic color. I saw different pictures of Mars from other amateurs which are using an IR/UV blocking filter. Threrofor I ordered an IR/UV blocker with the following properties.
On top of this I will purchase two IR bandpass filters: 642 and 742nm IR bandpass filters. Below is a graph showing the IR bandpass and the sensitivity of the ASI224MC camera.
RGB lines represent the sensitivity of ASI224MC
642, 742 and 807 are graphs of the IR bandpass filter.
The vertical lines are emission lines as a reference eg. H-alpha, OIII, Na, Hg
The grey line in the back is a typical curve of an astrosensor.
