Yo,
on Thu, 10 Feb 2000 16:01:17 EST, Johnsonpa@xxxxxxx wrote:
>Last question, I think: The thread on curtain speed, etc. got me thinking
>about the accuracy of my meter. I set the camera to manual in low light and
>the meter read, for example, 1/4. (I don't have an eyecup, but tried to
>prevent light from entering the viewfinder) I tripped the shutter and it
>sounded like 1/4 sec. Next, I left the f-stop the same and moved the camera
>to auto and tripped the sutter. The shutter stayed open for well over 1/4
>second, probably closer to 1 sec. This happened for both my
>OM-2 and OM-2n. I realize this is pretty inexact, but I don't have the
>electronic background as some of you clearly do. So, any thoughts on what
>might be causing this?
Did you have film in the cameras when you did that? On auto, the exposure
time is controlled by measuring and integrating the light reflected off the
film surface during the exposure - once the film has received (and
reflected) enough light, the shutter is closed. If you don't have film in
there, there's no film surface to reflect the light, and the sensor only
receives the much smaller amount of light reflected by the black pressure
plate - so it will take much longer for it to receive enough light to start
the second shutter curtain.
MtFbwy,
Volkhart
--
Volkhart Baumgaertner email: kyu@xxxxxxxxxxxxxxx
MausNet: @MGN
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