For a given camera movement, the arc of movement of the image in degrees is
the same for any lens, but since the 90mm is going to be almost twice as far
away as the 50mm to keep the subject the same size, that same arc will cover
almost twice area.
So the rule still stands. :.)
Chip Stratton
cstrat@xxxxxxxxx
> I would think the rule of focal length and lowest shutter speed for hand
> holding does not apply for macro lenses when their magnification is equal.
> Iow when both lenses are set at 1:2 the shorter focal length of the 50mm
> lens no longer gives you any advantage in shutter speed tolerance.
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