But what if the meter is off. Is there photon flow if there is nothing
to measure it?
Gregg
"John A. Lind" wrote:
>
> At 22:32 1/29/00 , Joseph wrote:
> >Isn't light is travelling through the lens whenever the lens cap is off
> >regardless of whether it is hitting the front of the shutter or the
> >film with a leica rangefinder? Leica's have focal plane shutters,
>
> Just like water in a pipe, photon flow is controlled by a valve, in this
> case a shutter curtain. If the shutter is closed in an RF, it stops the
> flow just as in a pipe. There's noplace else for it to go. However, in an
> SLR when the shutter is closed, the mirror is down allowing continuous flow
> off the mirror through the prism and out the viewfinder.
>
> This brings to mind a preventive measure that can be used by OM-1[n] owners
> to slow down the wear process, the MLU. Simply flip up the MLU when the
> lens cap is off and not taking a photograph. This blocks the other path of
> photon flow out the viewfinder.
>
> -- John
>
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