[rollei_list] Re: Selenium Light Meters
- From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 29 Apr 2005 19:37:14 -0700
Marc,
Is this the first time I have agreed with you completely? :-)
Jerry
Marc James Small wrote:
> At 01:07 PM 4/29/05 -0700, Richard Knoppow wrote:
>
> > Beware of two problems with Weston meters: The first is=20
> >that the angle of view is very wide. This may give you false=20
> >readings when outdoors if you are not careful to avoid too=20
> >much sky in the reading. When used for close reflection=20
> >readings they are very good.
> > The second problem is with older meters calibrated in=20
> >Weston speeds. While these translate to the next higher=20
> >ISO/ASA speed the calculator seems to have been designed to=20
> >remove a safety factor in the speeds. I have several Weston=20
> >meters all with good cells. All underexpose if the Weston=20
> >equivalent of an ISO speed is entered.=20
>
> 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. =20
>
> Weston speeds are effectively .8 ASA. There are a gazillion warnings to
> 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 accurate
> result than will anything else.
>
> Marc
>
> msmall@xxxxxxxxxxxx=20
> Cha robh b=E0s fir gun ghr=E0s fir!
>
> NEW FAX NUMBER: +540-343-8505
>
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