IC 434 Horsehead Nebula with Ha/O3 dual filter

[old_eyes]

Captured on Pier 5 @Roboscopes (Tak Epsilon 180, ASI 2400MC Pro, Askar ColourMagic Ha/O3 filter, unguided Paramount MX).

73 x 120 sec subs for 2hrs 26mins integration time.

Processed in Pixinsight.

Continuing experiments with the dual band filters. Lots of glare from Alnitak and Alnilam (even more dominant in an OSC image). Alnitak is controlled to some extent by the strong Ha surrounding it. Alnilam is against a dark sky. I could not find a way of controlling Alnilam without making the whole image look weird and unbalanced, so I left it. This version is slightly cropped from the original.