[rollei_list] Re: Selenium Light Meters
- From: "Peter K." <peterk727@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sat, 30 Apr 2005 09:29:16 -0700
Uh-oh. The world is changing and a blue moon will rise tonight. :-)
On 4/29/05, Jerry Lehrer <jerryleh@xxxxxxxxxxx> wrote:
> Marc,
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> Is this the first time I have agreed with you completely? :-)
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> Jerry
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> Marc James Small wrote:
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> > At 01:07 PM 4/29/05 -0700, Richard Knoppow wrote:
> >
> > > Beware of two problems with Weston meters: The first is=3D20
> > >that the angle of view is very wide. This may give you false=3D20
> > >readings when outdoors if you are not careful to avoid too=3D20
> > >much sky in the reading. When used for close reflection=3D20
> > >readings they are very good.
> > > The second problem is with older meters calibrated in=3D20
> > >Weston speeds. While these translate to the next higher=3D20
> > >ISO/ASA speed the calculator seems to have been designed to=3D20
> > >remove a safety factor in the speeds. I have several Weston=3D20
> > >meters all with good cells. All underexpose if the Weston=3D20
> > >equivalent of an ISO speed is entered.=3D20
> >
> > Richard
> >
> > You are apparently too young to have been properly trained on selenium
> > meters <he grins> , but the proper method is to wave them around a bit =
to
> > obtain an average. I worked political events in the dark ages, and, as
> > late as 1968, we still had the Speed Graphic dudes there waving their
> > meters around. =3D20
> >
> > Weston speeds are effectively .8 ASA. There are a gazillion warnings t=
o
> > CALIBRATE YOUR OWN FILM!!! from all sources but I have yet to find a
> > single film which does not properly respond when the adjustment is made=
.
> > (That is, 400 ASA is 320 Weston).
> >
> > Selenium meters are the closest match to the light response of chemical
> > film, and so selenium meters deserve great respect. They can be a huge
> > pain in the butt to use but, in the end, they will produce a more accur=
ate
> > result than will anything else.
> >
> > Marc
> >
> > msmall@xxxxxxxxxxxx=3D20
> > Cha robh b=3DE0s fir gun ghr=3DE0s fir!
> >
> > NEW FAX NUMBER: +540-343-8505
> >
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--=20
Peter K
=D3=BF=D5=AC
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