I´m not sure if you are looking for the attached file. It is in German but there is a table included showing the different focal lengh if you insert one of the additional rings or both or remove one lense group.
So with the 17mm eyepiece to will additionally get 13.1mm (14mm ring), 10.8mm (28mm ring), 9.2mm (both rings) or 21.8mm without rings and without the 1 1/4" front lense group.
I bought that eyepiece as well as both rings but I´m very new to astronomics and did use the eypiece only as delivered (17mm) so far. I have also the 13mm eyepiece.
There is also a complete download page available including English docs: https://www.baader-p...om/de/downloads (scroll down...)
Hmm, the file I attached is to big, so here is a screenshot.
Edited by elythomaslumber, 05 March 2021 - 07:19 AM.