but that brought up more questions.
I have found 2 items I cant get my head around no matter how I search the web
1. in the attached pictures there is lettering M.J have no idea what it translates too all docs I have searched have no reference to this one.
2. if this is a 40x objective why does the zeiss catalog state it has initial magnification of 100x all other objectives on list the X ratio corresponds properly to the initial mag column??

I guess I don't understand this initial magnification thing very well LOL.
cheers