Re: question about ISO vs EI

["Christina Z. Anderson" <tracez@xxxxxxx>]

But Ben, what I don't get is why would your speed go UP when you meter with
a filter on?  Why wouldn't it decrease, as is usual when you are
compensating for filter factor? I must be missing the very obvious here.  It
seems you rate it at 12 without the filter and 50 (two stops) with the
filter???  Why wouldn't it be 50 without and 12 with the filter?  What do
you mean, also, by not finding any difference between 1/4 sec and 15
minutes---exposure? I'm very confused.
Chris
> At 09:12 PM 10/17/2000 -0600, you wrote:
> >Ok, I got the following out of Paduano's book, and I just am puzzled:
> >      "With no filter, Kodak has a suggested ISO of 80, and Konica of 32.
> >With a no. 25 Kodak is 20, Konica is 8.  EI for Kodak is 200, for Konica
is
> >50-64, except under low light for Konica use an ISO of 100. "
>
>  From what you've quoted here, the ISO is metered without a filter (ie. no
> filter on the lens, or handheld light meter) whereas the EI given would be
> metered through the lens WITH the filter on.  Interesting that they
suggest
> increasing Konica's speed in low light..  I rate mine at 12 (50 through
the
> filter) and don't find any difference between 1/4 sec to 15 minutes. It'd
> be interesting to see what they consider low light to be.
>
>
> Cheers
>
> Ben
>
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