Think about it a moment. You are designing the circuit. It is really
easy to simply have it wait until sufficient light has been sensed and
release the 2nd. curtain in TTL or simply hold the shutter open for the
time calculated based on the light level sensed when the spot buton was
pressed. In order to pick specific speeds, you actually need more
circuitry and programming to correctly pick a specific shutter speed
from a list. In other words, it takes more design complexity to make a
system with a higher average exposure error. So of course nobody did that.
The dots in the viewfinder resolve to 1/3 stop, but they are just an
approximation of the actual stepless speeds in auto.
Moose
Mike Lees wrote:
>What about in spot mode and the multi-spot average? Are shutter speeds still
>continuous despite the exposure being determined prior to exposure? The dots
>in the viewfinder would suggest a resolution higher than the standard shutter
>speeds.
>
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