>
> This is what I think is happening so correct me and
> add bits that are missing.
>
> Auto-during exposure
>
> -Mirror is out of the way
> -Light hits the film and reflects
Below 1/60s reflect from film, above 1/60s reflect from shutter curtain.
> -The SBC photo cell reads the reflected light
>
> Auto-spot before exposure
>
> -Mirror is in the way
> -The mirror (half mirror) lets some light thru
> -The light reflects on the fresnel lens sub mirror
> -The SBC spot metering area reads the amount of light
>
> *Auto average before exposure
- Center weighted average
- light path same as auto-spot except wider coverage area.
> *Manual
- Same as "auto-average" before exposure, only display mode different.
> *Manual spot
- Same as "auto-spot", only display mode different.
>
> What is interesting is if somehow different amount of
> light can fall on the photo cell in the different
> modes.
> Or if some calculations are done so that the same amount
> of light gives different outputs in the finder.
>
> I would really like if the readings show exactly the
> same in auto/manual regardless of film used or any other
> settings.
My 4Ti get it if shutter speed above 1/60s. Below 1/60s, around 1 stop
over.
> And that OTF was used to correct for light changes that
> appear DURING the exposure.
> Or is this just some stupid idea I have ?
You are right, if shutter speed is below 1/60s, the shutter speed will
change with changing light.
>
> Best Regards
> Joakim Svensson
>
Welcome if someone found any addition or correction.
C.H.Ling
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