IC443, RASA 8", 6 hrs (!no filter!)

Posted: Mar 29th, 2026

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NGC

Technical Info

Telescope/Lens: Celestron RASA 8

Camera: Player One Poseidon-C

Mount: ZWO AM5N

Software: Nina, PixInsight

Exposure:

175 x 120" ISO/Gain: 125 - no filter

Orange, Bortle 6 zone:

Sofrino, Russia

Mar 15th, 2026

5 h 50 m

Resolution: 5565x3875 px

Scale: 6731 KB

ankorot

IC443

Celestron RASA 8", F=400mm F/2.2

A test of "what happens with no filter at all?" – and here's the answer. It's a mess due to halos.
Interestingly, I then went looking for an anti-light pollution filter that also had a built-in UV/IR cut and was suitable for fast optical systems.
And I didn't find one. There are triband or quad band filters.

Also, here you can see how bad a large APS-C sensor is on the RASA 8" (seems not too bad – it was predicted to be worse).

I deliberately didn't stretch this frame – there's nothing here to enhance. This is a technical version of "what happens if..."

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