Hehe - ok, i managed not to get confused... do i get a cookie? (i did have to re-read some parts tho...)

Interesting to think of it - rather than just accepting the "crop factor" thingey.  I think the only problem is when you are using wide angles as the size of the subject / perspective difference between focal lengths is a lot greater than when you use telephoto's.  I would assume that the difference is sooo small that you can safely use say a 200mm lens on a 1.6x crop to get what you might expect to see using the FF version of that lens (320mm?), but not in the ranges where changes in wide angle focal lengths make a huge difference in terms of size of subject relative to background / perspective.

Did that make sense? Do you even agree?... i am just making an educated guess at things here...

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