Hi there,

I just bought a set of Astronomik Deep Sky RGB filters so I can use them with a new Poseidon M PRO (switching to MONO from my ASI294MC PRO after two years).

I've noticed that with no filter or with my current Astronomik L2 filter, there are no halos. I've been using this L2 with the 294 successfully for a couple of years.

As you can see, halos in G and B are severe. In R, they are noticeable but not so severe.

This is a sample of 15s subs taken with each filter L R G B. Focusing routine with each filter.

So, the fact that I am not getting halos with no filter or with my L2 makes me think the new set have a problem with internal reflections.

Any thoughts or ideas are welcome.

Thanks in advance,
Guiem.

Astronomik DeepSky Halos.png
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