I need help about the backfocuses for the combination Esprit 150 with Feathertouch Focuser 3545 with and without the TS-Flattener 2.5".
TS (Telescope-Service in Germany) isn't able to answer my questions; they don't know it or they won't give an answer (they pretend to have no time).
I calculated all parts by myself and they would only have to check the measurements marked with the stars in my two pdf-sheets:
* richtig? = * right?
* Bitte das richtige Mass angeben! = * Please give the right measurement!
Can anybody help me?