Hi all,
To date I only made a few brief attempts at using Riccardi reducer, as I found imaging with a short 4"refractor at f/4.5 more demanding than much more casual f/6.
Thanks to Glen's and Greg's clarifications on calculating correct spacing when accounting for thickness of filters in the imaging train, I corrected the spacing and star shapes have improved. Thank you Glen and Greg very much.
Humidity has gone up a bit so I may need to wait a bit for a few clear nights, nonetheless last night weather gods allowed me to collect initial 6 hours of 3nm Ha. I wish I had 5nm Ha to include nitrogen line.
I will most likely drizzle the data for the proper image.
6 hours of Ha:
https://cdn.astrobin.com/thumbs/hggz...6_wmhqkGbg.jpg
10 hours of Ha:
https://cdn.astrobin.com/thumbs/YHAK...6_kQt6vfvn.jpg
26 hours of Ha:
https://cdn.astrobin.com/thumbs/evyP...6_kQt6vfvn.jpg
Thank you for looking
Suavi