I am a bit bewildered... I know about and have owned 4x5 Sinar Fs- F2s - Normas, but as I move to 8x10 (and probably the P system) I am looking around and sometimes I see '8x10 P rear standard" and then I read again about how modular the Sinar system is and am baffled... How freaking modular is it if I have to get an 8x10 P rear standard to replace my perfectly good 4x5 P rear standard? And how do I even tell what an 8x10 rear standard even looks like -- how is different?

And then the MB and non-MB backs... do the MB backs fit on the older chrome P standards?

Are all the P2 cameras MB versions?

(Who in the world ever actually used the darn metering back anyway!? Elves in Switzerland?)

Nobody, least of all Sinar, has ever posted a really complete explanation, at least as far as I can search. So maybe David Goldfarb and few other Sinar experts can enlighten me? Thanks!