[rollei_list] Re: OT: cds vs. selenium
- From: "Gene Johnson" <genej2ster@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 7 Aug 2007 18:13:51 -0700
MY palm is a zone 7. Always.
On 8/7/07, Eric Goldstein <egoldste@xxxxxxxxx> wrote:
> That is a great observation. In contrast (bad pun, sorry), facial
> flesh tones can vary by 2 stops or more. The palm thing is more a
> quick and dirty baseline more than anything else...
>
> Eric Goldstein
>
> --
>
> On 8/7/07, Allen Zak <azak@xxxxxxxxxxxxxxx> wrote:
> > Interestingly enough, I have measured light from the palms belonging to
> > persons of several races with differing skin hues and find less than
> > than 1/2 f stop difference among them.
> >
> > Allen Zak
> >
> > On Aug 7, 2007, at 10:13 AM, eroustom@xxxxxxxxxxx wrote:
> >
> > > Just like everything else... I've been told one stop, as the palm of
> > > just about any hand is zone 6.
> > > That's what's great about photography: no answer is right, and the
> > > confusion can only be settled with yet another roll of film, or two.
> > >
> > > E.
> > > -------------- Original message ----------------------
> > > From: "Gene Johnson" <genej2ster@xxxxxxxxx>
> > >> metering the palm of my hand in the same light as the subject, and
> > >> adding two stops of exposure has always been a good start for me.
> > >>
> > >> On 8/6/07, ERoustom <eroustom@xxxxxxxxxxx> wrote:
> > >>> Thank you. That makes sense now.
> > >>>
> > >>> Elias
> > >>>
> > >>> On Aug 5, 2007, at 11:14 PM, Marc James Small wrote:
> > >>>
> > >>>> At 10:44 PM 8/5/2007, ERoustom wrote:
> > >>>>>> I suspect that part of the canard of inaccuracy comes from the
> > >>>>>> reality that we have institutionally forgotten that a selenium
> > >>>>>> meter needs to be used differently from the manner in which a CdS
> > >>>>>> or later meter is employed. LEARN how to use a selenium meter and
> > >>>>>> it is perfectly suitable.
> > >>>>>
> > >>>>> Could you give a novice a hint or two on the differences in using
> > >>>>> the
> > >>>>> two?
> > >>>>
> > >>>> Selenium offers a metering material which more closely matches the
> > >>>> response range of chemical emulsions than do later materials such
> > >>>> as CdS, SPD, or Gallium Arsenide. But selenium requires a wider
> > >>>> acceptance angle -- no one has yet manufactured a one-degree
> > >>>> Selenium spot meter!
> > >>>>
> > >>>> Accordingly, you have to average a good deal. This generally
> > >>>> requires more attention to what is being metered coupled with
> > >>>> sweeping the meter up and down and side to side to obtain an
> > >>>> average reading. The reading so obtained should be quite usable.
> > >>>>
> > >>>> Marc
> > >>>>
> > >>>>
> > >>>> msmall@xxxxxxxxxxxx
> > >>>> Cha robh bàs fir gun ghràs fir!
> > >>>>
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