In article <5f3nqf$88u@alexander.INS.CWRU.Edu>, cu050@cleveland.Freenet.Edu says... [most deleted]

>How does yellow trick a camera into underexposing? For that matter, how
>does yellow trick a light meter into underexposing? Or film? If a
>light meter is reading reflected light, it's merely looking at the
>amount of reflectance- the percentage of reflectance- and it adjusts
>relative to its internally programmed baseline- 15%. No matter the
>color, 15% reflectance is 15% reflectance. [....]

Most meters have considerable color error relative to absolute
values, and relative to general film response. With pure red,
this error often results in about 1.5 stops of underexposure!
(Try using a red filter on the lens, using the camera TTL meter
with most B & W films, and I think you will immediately experience
the error! Or, read a grey subject without a 3-stop red filter
on the lens, then with it [all else kept constant] - the meter
will generally be about 1.5 stops away from grey, rather than the
expected 3-stops.) Most colors are not read correctly, but since
there is generally a mix of colors in the subject, and since most
of the colors are not high intensity (they have a large grey
component), all is OK much of the time (though I find myself
shifting the ASA when shooting flowers close-up...).
Maybe the F5 cures these color metering inaccuracies...
Hope This Helps