Steve Jolly wrote:
Gonz wrote:
If the lens/body was moved in a perfect parallel manner, then you are
right, 1mm of body/lens movement == 1mm of subject movement.
Nope, I'm afraid that's only true at 1:1 magnification. See my
explanation in my most recent reply to Bob for a simple test that you
can perform that disproves this statement.
Sorry Steve, I dont believe this is correct. Magnification should have
nothing to do with it. Its simple geometry. Imagine a line right down
the center of the focal area, now move that line in a parallel way some
distance, i.e. 1mm. The entire line, being parallel, by definition is
1mm apart from infinity to infinity.
If you deviate from the parallel motion, then there is a
magnification involved which includes the angle of the motion as well
as the field of view of the lens. With long lenses, the FOV is very
small, therefor any small andular movement seems highly magnified.
That *is* true, yes.
S
--
Someone handed me a picture and said, "This is a picture of me when I
was younger." Every picture of you is when you were younger. "...Here's
a picture of me when I'm older." Where'd you get that camera man?
- Mitch Hedberg
- Re: A10: Pentax Image Stabilization is here Gonz
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