[rollei_list] Re: F16 Rule was Re: New Pics Posted....Rolleiflex and Zeiss Ikon images..
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 31 Jan 2006 15:48:28 -0800
----- Original Message -----
From: "Allen Zak" <azak@xxxxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, January 31, 2006 2:01 PM
Subject: [rollei_list] Re: F16 Rule was Re: New Pics
Posted....Rolleiflex and Zeiss Ikon images..
It is to laugh! In my world, meter readings indicate a
decrease in brightness.
My Luna Pro (recently tuned up at Bogen) sez ISO/ASA @
f9.5-ish, almost never suggests f16. I have been metering
under these skies for more than 50 years, off and on, and
have a feel for the area's illumination. Other
photographers here agree there is, on average, less
intensity to the light than in former decades. Many
locals think this anomaly is attributable to atmospheric
changes and/or air pollution.
I report, you decide.
Allen Zak
On Jan 31, 2006, at 3:16 PM, Peter J Nebergall wrote:
Right now (3:30PM) Both my Luna Pro and Seconic Studio
Pro (set for ISO-100) say 1/100 at around f/12.5, at least
when the sensor is pointed straight at the sun. There is a
difference between the two when the sensor is pointed at
about a 45 degree angle, the Sekonic showing a larger
difference. A reflected light reading with the Luna Pro
shows about the same as its incident reading. Weather here
is clear but slightly hazy.
In full summer sunlight these meters show about f/22 for
the same scene and meter position.
I have not noticed a trend up or down in readings here
and have been at this location for nearly 20 years.
There is probably a web site somewhere that gives the
current solar constant and atmospheric transmission.
I have several meters, mostly pretty old, which generally
agree. The one that doesn't always is a Weston Master II. I
think this is because it has a much wider acceptance angle
than the others. Also, it seems to me (and others with
Westons can check this) that the meter reads right when set
for about half the Weston equivalent of the ISO speed. I no
longer have the standard Weston used. The usual rule is to
use the next lowest Weston speed to the ISO speed but this
underexposes by about a stop on all Weston meters using the
original Westons speeds.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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