O Gurus --

Sorry if this is too abvious a question. I do know that it's one
I should have had answered somewhere a long time ago, to wit:

When a (Pentax, of course) viewfinder is described as having "0.9 magnification" 
-- indeed, any value less than 1.0 -- what exactly does that mean? When the
light arrives at the mirror, already magnified a known amount by the lens, does
the viewfinder "de-magnify" or "push it away again" by 0.1? Or does it simply
mean
that 10 percent of what's on the mirror is masked off or otherwise lost, and
you're seeing only 90 percent of what's going to be in the photograph?

I ask this because of a persistent bad habit I have: When I haven't been using 
a zoom for a while, I find I have to retrain myself to be more aggressive in
pulling the zoom to frame the shot. Unless I consciously compensate, the subject
when printed always seems farther away than what I remember seeing in the
finder.
I figure that if I actually understand what's going it's more likely that the
lightbulb will go on and the compensation will become a reflex.

All insights appreciated,

Stephen Moore
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