[rollei_list] Re: Selenium Light Meters
- From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sat, 30 Apr 2005 11:18:22 -0700
Peter,
FYI, a "Blue Moon" means refers to a month in which there are
TWO full moons.
Jerry
"Peter K." wrote:
> Uh-oh. The world is changing and a blue moon will rise tonight. :-)
>
> On 4/29/05, Jerry Lehrer <jerryleh@xxxxxxxxxxx> wrote:
> > Marc,
> >=20
> > Is this the first time I have agreed with you completely? :-)
> >=20
> > Jerry
> >=20
> > Marc James Small wrote:
> >=20
> > > 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
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> --=20
> Peter K
> =D3=BF=D5=AC
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