For sure others will provide a more accurate explanation, but in my
understanding the little sticky out thing tells the body how many stops
difference there is between the fully-open aperture (eg f/1.8) at which
metering will take place, and the dialled-in setting (eg f/11) at which the
exposure will be made.
The body just has to compute the necessary exposure (speed) setting for that
amount of light taking the 'difference' into account.
Ignore all the above if you're considering how OTF TTL does it...
Hope you're feeling a bit more illuminated.
br
jez
On Tue, Mar 25, 2008 at 8:04 PM, Johan Malmstrom <jmalmstrom@xxxxxxx> wrote:
>
> But how did the OM's do it?
>
> What information is actually "sent" with that little thing sticking
> out of the lens. When comparing two lenses (35-70/3.6 and 50/1.2) I
> can't see any difference in them?
>
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