Contains:  Solar system body or event
Ptolemaus - Alphonsus - Arzachel - 20210321 - Celestron C6 - IR Pass - BAD Seeing, altazastro

Ptolemaus - Alphonsus - Arzachel - 20210321 - Celestron C6 - IR Pass - BAD Seeing

Acquisition type: Lucky imaging
Ptolemaus - Alphonsus - Arzachel - 20210321 - Celestron C6 - IR Pass - BAD Seeing, altazastro

Ptolemaus - Alphonsus - Arzachel - 20210321 - Celestron C6 - IR Pass - BAD Seeing

Acquisition type: Lucky imaging

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Description

This is an example of how the use of an IR Pass filter can salvage your evening on the Moon.

You have left the scope outside to acclimatize for more than a hour, you have setup the mount, the powerline, the computer, all the cables ... and when you see your craters on the screen they are boiling like a soup on the fire!

You change the standard IR CUT filter you use with a bandpass IR (indeed R- near IR in my case) filter and you can immediately see some improvement on the monitor: the craters seem to boil a bit less.

Nevertheless, this just means you get a barely passable image from a very bad seeing night, but any night with just decent seeing would give you much more detail, way more than the difference due to the lower resolution caused by the use of longer wavelengths with the IR Pass filter.

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Ptolemaus - Alphonsus - Arzachel - 20210321 - Celestron C6 - IR Pass - BAD Seeing, altazastro