Hi Andrew
I don’t know anything about the design of the EM400 PAS and reticule, nor how they work, but I do believe that the NJP mount PAS is quite different to the EM200, so not all Tak mounts are the same in terms of the PAS and their polar alignment routines.
At a guess, if the EM400 has the following EM200 features, I suspect it should work:
- Levelling bubble on the RA casting.
- An outer Date (1-12) reticule (CW).
- A concentric inner Time (0-23) reticule (ACW).
- An etched position for Sigma Octans with a scale from 2000 to 2030
Cheers
Dennis