M31 Ha G B attempt

[knobby]

Hi all, I stupidly bought a 5 position EFW when I went mono (cheapskate 🙂)

So, I get fed up with the filter dance every year and had a bash at leaving Ha - Sii - Oii - G - B in the wheel.

20 mins each filter Ha G B.

Might try longer as It seems promising.

Edited September 19, 2023 by knobby

[knobby]

PS, looks far less rubbish on a phone screen 🙂

 

[ollypenrice]

You need red. The main reason is that Ha stars will be much smaller than broadband red ones but, also, not all red in the sky is from Ha. A lot of it is found in dusty regions or in regions of ERE (Extended Red Emission.) Note how blue your stars are.

In my view, the filter to dump would be the SII since it makes the smallest contribution to Ha OIII SII palettes on most objects and because 2 channel NB like HOO works so well.

Olly

[knobby]

Cheers Olly, that was on my next things to try list 👍🏻