Ok - I re-created my scope test mission, and took a look using the new cameras.dat file posted by elanaiba above - here's what I saw, compared to what I saw before with RFB 1.28 (I reduced the sizes of the new screenshots before I uploaded them to reduce the "bulk" of the post, but the other ones were already uploaded and I didn't have time to re-size and re-upload them - don't let that throw you):
Elanaiba Attack Scope at 6X:
RFB 1.28 Attack Scope at 6X:
Elanaiba Attack Scope at 1.5X:
RFB 1.28 Attack Scope at 1.5X:
Elanaiba Obs Scope at 6X:
RFB 1.28 Obs Scope at 6X:
Elanaiba Obs Scope at 1.5X:
RFB 1.28 Obs Scope at 1.5X:
As you can see, the ships look quite a bit smaller in elanaiba's version than in the Mav/RFB 1.28 version, at both 6X and 1.5X. Also note that in elanaiba's version, the ships don't look the same size in the two scopes when both are at 6X looks bigger/covers more ticks in the attack scope than in the obs scope). Not sure what any of that means yet or which one is more "right" (or even, which one I like better) - just reporting what I saw. Will have to think about this some more.