On Tuesday night/Wednesday morning I took my first shot with my new ASI2600MC Pro through a Vixen SD81 with a dedicated flattener and reducer. This is the result.
https://www.astrobin.com/7lbfzq/#share-modal
Most importantly, I'm delighted with it. That's what counts. I'd like to learn more though, so I've looked at a random individual frame using Pixinsight Abberation Inspector, and it shows this.
The same process on the stacked image shows this...
To my eyes, the stars in the top left and top right seem to be pointing away from the centre, but the stars in the bottom corners look ok. Is that tilt?
I then converted to greyscale, and ran FWHMEccentricity thing on a single frame (I'd read if you'd had a merdian flip, this would be best) and got these maps...
To me, they just look like rainfall maps for where I live.
Anything obvious I could do to improve things or should I just leave well alone?! The main reason I ask is the ambiguity about the spacing distance required by the flattener/reducer. Vixen say one thing, their diagrams say another! If that was wrong though, I'd expect the stars to stretch in all the corners. I am, however, dim.
Thanks for looking.
https://www.astrobin.com/7lbfzq/#share-modal
Most importantly, I'm delighted with it. That's what counts. I'd like to learn more though, so I've looked at a random individual frame using Pixinsight Abberation Inspector, and it shows this.
The same process on the stacked image shows this...
To my eyes, the stars in the top left and top right seem to be pointing away from the centre, but the stars in the bottom corners look ok. Is that tilt?
I then converted to greyscale, and ran FWHMEccentricity thing on a single frame (I'd read if you'd had a merdian flip, this would be best) and got these maps...
To me, they just look like rainfall maps for where I live.
Anything obvious I could do to improve things or should I just leave well alone?! The main reason I ask is the ambiguity about the spacing distance required by the flattener/reducer. Vixen say one thing, their diagrams say another! If that was wrong though, I'd expect the stars to stretch in all the corners. I am, however, dim.
Thanks for looking.
