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

  • From: "Peter K." <peterk727@xxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Sat, 30 Apr 2005 09:28:18 -0700

Just out of curiousity, why do you use Weston meters? Because tey are
batteryless? I used to use a Norwood Director, but hated it. I went to
digital with a Minolta IIIf years ago and never regretted it. Now I
use a Sekonic L508. Simple and easy and far more accurate then the
Director ever was.

Peter K

On 4/29/05, Jerry Lehrer <jerryleh@xxxxxxxxxxx> wrote:
> Richard,
>=20
> I am not surprised at your statement, I am ASTOUNDED!
> At one time I compared all my Weston meters, to a Luna
> Pro.  All the Westons had been checked out by QLM.
> They were in agreement after the corrected film speeds
> were used (Weston vs. ASA) The Westons ranged from
> the pre-Master 650 to the Euromaster II, except for that
> POS Master 6 (Japanese made toy)
>=20
> Jerry
>=20
> Richard Knoppow wrote:
>=20
> > ----- Original Message -----
> > From: "Jerry Lehrer" <jerryleh@xxxxxxxxxxx>
> > To: <rollei_list@xxxxxxxxxxxxx>
> > Sent: Friday, April 29, 2005 4:32 PM
> > Subject: [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
> > >
> >    Check the Weston against another refleced light meter on
> > a large flat surface. A gray card is not necessary because
> > one is only comparing the two meters for a given amount of
> > light. Laying them on the surface of a light table also
> > works. You will find that the Weston will give you shorter
> > exposures when the speed setting is made to the "equivalent"
> > ISO speed. This is the next lower number on the Weston
> > scale. When the original ASA system was in use this worked
> > fine because that system had a 2.5 times fudge factor built
> > in.
> >    I was somewhat surprized at this myself but have found it
> > consistent on several Weston meters which are calibrated in
> > Weston speeds.
> >    It is interesting to compare the Kodak speeds with Weston
> > speeds. Kodak speeds were measured using the minimum
> > gradient method of L.A.Jones and later adopted by the ASA
> > but with the addition of the fudge factor. Kodak Speeds are
> > approximately double the current ISO speeds and were about 4
> > times the old ASA speeds (with safety factor). Here is a
> > comparison of some film speeds as given in c.1944 Kodak
> > literature:
> >
> > Film          Kodak     Weston
> > Plus-X        250        50
> > Portrait Pan  200        40
> > Tri-X         800        160
> >
> >     Weston speeds may not be exactly a factor of 5X from
> > Kodak speeds because Weston also classified speeds by
> > groups.
> >
> >     The Weston speeds were determined by making a D-Log10E
> > curve of film developed to a a gamma typical for the film.
> > The measurement point was the log exposure point at which
> > the density was equal to the gamma, i.e., for a gamma of 0.7
> > the speed point is measured at a density of 0.7.
> >
> > ---
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx
> >
> > ---
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> ---
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--=20
Peter K
=D3=BF=D5=AC
---
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