>One thing I made sure to do was bracket via the exposure
>compensation nob on the body. Soemthing else I was
>doing, and which I realize belatedly was silly was using
>the auto mode.
The exposure compensation knob has the same effect of setting a different
film speed, so it only would vary exposure time in Auto mode.
>So I would take a picture. It would take however many
>seconds. And then I would compensate and would take
>longer or shorter depending on which way I turned the
>knob.
If exposure time was too long (say, more than 2 or 3 minutes), it may be
over the range of the OM-2n, so it exposes for the maximum time, regardless
(between certain limits!) of exposure compensation and/or film speed.
>This time I make sure I
>am in manual. (As it was daylight there wasn't a need
>for long term auto exposure anyway.)
Turning the ASA/exposure compensation knob in Manual _only_ affects the
needle's indications. The only way to change exposure in manual is setting
shutter speed and/or aperture.
>I thought about this awhile and decided that it might
>have something to do with using print film instead of
>slides.
Cartainly.
>So I get slide film. Kodak Elite Chrome 200. I once
>again go to the wooded path scene and try exposure
>control, and await on pins and needles the results. Once
>again there is little or no difference.
With exposure times of several minutes, the reciprocity-failure effect can
reduce differences in exposure.
Regards,
...
Carlos Santisteban
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