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Mars 26th Nov. 2020 IR(sG)B vs RGB


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About this observation
Martin Lewis
Time of observation
26/11/2020 - 20:02
Observing location
St Albans UK
444mm Dobsonian
ASI224MC for colour
ASI174MM for IR and B
642nm filter for IR
Astronomik B filter

Head-to-head processing comparison on Mars. One-shot colour on left & IR + synthetic Green + Blue composite on right. The IR(sG)B shows more cloud details & is much better when seeing poor but, when the seeing is good, & you are diffraction limited, the colour resolution wins out as the airy disc size is smaller due to the shorter wavelength.

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