The sky was transparent, but the moon was too bright and time too short to shoot really dim targets. I went for M81/M82 to see how the Rasa performs on galaxies. The RASA is designed for large fields, and not smaller targets. I expect undersampling with 2.4 arcsec/pixel and OSC .
I shot the very same object with a 750mm FL Newton before (darker sky so don't consider noise):
https://www.astrobin.com/8vt23p/B/The goal is to find out how much FL I need for galaxies, and if I should "invest" in a longer FL scope to replace my Newt.
- In my opinion, the difference between 400mm and 750mm is not huge with respect to resolution. 750mm is a tad better I suppose.
- I like the diffraction spikes of the Newt. The Rasa difraction soikes should be dealt with by using some cable management.
Conclusion: 750mm FL might be sufficient where I live.
Do I need another scope then? Of course I do!
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