projects/Back Focus I took a structured approach to determine the back focus of my Esprit 120ED with the 0.77 reducer. I created a sheet with possible options and made test exposures to assess the results. For each back

How I determined the back focus of my Esprit 120ED with the 0.77 flattener: skellner.github.io/projects/Bac...

#astrophotography #backfocus #esprit120ed