[rollei_list] Re: Hello (again), new Rollei TLR

Richard,

I have been using Weston meters since before you were
born, and I did not have under exposures when I used
the meter correctly.  I have used Weston, ASA, DIN and
Scheiner speeds with the corresponding dials.

The first Weston meter I used was in 1936, and it was spot on
when I sold it this year.

Jerry

Richard Knoppow wrote:

> ----- Original Message -----
> From: "Ardeshir Mehta" <ardeshir@xxxxxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Friday, April 29, 2005 12:25 PM
> Subject: [rollei_list] Re: Hello (again), new Rollei TLR
>
> >
> > On Friday, April 29, 2005, at 02:26  PM, Marc James Small
> > wrote:
> >
> >> My heavens, Jerry!
> >>
> >> Learn to estimate exposure.  Sunny 16 rules!
> >>
> >> Don't need no steenken' meter!
> >>
> >> Marc
> >
> > Darn right, Marc! I do have a Weston Master II but hardly
> > ever use it,
> > even for Velvia 50, and DEFINITELY not for B&W. My
> > exposures are almost
> > always spot-on. When I feel doubtful, I take two shots
> > with different
> > exposures of the same subject, and thereby make up for it.
> >
> > Cheers.
> >
> >
> > Ardeshir <http://homepage.mac.com/ardeshir>
> >
>    Beware of two problems with Weston meters: The first is
> that the angle of view is very wide. This may give you false
> readings when outdoors if you are not careful to avoid too
> much sky in the reading. When used for close reflection
> readings they are very good.
>    The second problem is with older meters calibrated in
> Weston speeds. While these translate to the next higher
> ISO/ASA speed the calculator seems to have been designed to
> remove a safety factor in the speeds. I have several Weston
> meters all with good cells. All underexpose if the Weston
> equivalent of an ISO speed is entered. I find they are right
> on when half the speed is entered. What I suspect is that
> for some reason Weston put a 2X safety factor in their
> speeds and then took it out again in the calculator. I have
> no idea why this might have been done.
>   The Weston speed system was the first independant speed
> rating available. Speeds were measured by Weston and
> published periodically in a booklet. Previous speed methods
> were such that they could easily be fudged by the
> manufacturer usually indicating the film was faster than it
> was. A number of other meter manufacturers adopted the
> Weston speed system. The exception was General Electric. I
> have never seen a description of the GE speed method. Older
> GE meters calibrated in the GE speeds should be set for the
> next higher number than the ISO speed. There doesn't seem to
> be any juggling of values in the calculators. Both Weston
> and GE meters are capable of giving accurate exposure
> information provided the cells are OK. The usual symptom of
> a bad cell is low readings at the high end of the scale.
> Weston meters are easy to test because the same light level
> can be read at both the top and the low end of the scale.
> The values should be very close. Bad cells typically read
> about a stop low at the high end.
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
> ---
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