> So where does the 1.6 come from?
It comes from the marketing guys. It is, and it remains, spin. That
is in the truest sense of the word. It is taking a patently obvious
deficiency of a product and "re-aligning" the criteria to make it
appear a benefit.
And there is no convincing the convinced otherwise: who will just as
readily swallow the "bigger sensors are better after all" message when
it finally arrives.
This makes it look like you used a lens
> with a longer focal length. In reality you just
> cropped the 35mm film. The light from the lens still
> covers a >43mm circle.
A 100mm lens has a focal length of 100mm (subject to tolerances) at
some agreed distance to subject.
Anyone who claims otherwise simply does not understand thier own
ignorance.
(Note: I've covered the varifocal nature of most modern lenses which
do change focal length slightly with focus distance)
Cropping images as a means of getting closer is a last resort: not
something to build an extremely expensive system around.
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