[rollei_list] Re: Meters and Film
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 1 Sep 2009 18:00:12 -0700
----- Original Message -----
From: "Carlos Manuel Freaza" <cmfreaza@xxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, September 01, 2009 5:35 PM
Subject: [rollei_list] Re: Meters and Film
Hi Richard:
That Sekonic sounds intersting, my Gossen
Lunasix F (Luna Pro- F) has the following accesories: The
Enlarging attachment for darkroom printing; the Microscope
attachment for Microphotography; the Fiber Optics Probe
attachment, a flexible fiber optics with a "scanner"
terminal for difficult readings; the Repro(Copying)
attachment to obtain exposure from flat subjects like
paintings, documents,etc. and the Variable Angle Attachment
that allows to do 7.5º and 15º spot metering, these are a
very good number of accesories for a handheld lightmeter.
I have the Variable Angle attachment for 7.5º and 15º
measurements, it requires a bit of compensation with the
lightmeter dial but it's an useful and interesting accesory
for previously planned photographs.
If I take portraits with back lit illumination, I don't
expose for highlights, I expose for shadows using the dome,
it produces an about right exposure for the subject and the
back lit is overexposed creating a nice effect around the
subject IMO, these are two samples (It's not Friday but I
don't have a better explanation for my point):
http://www.flickr.com/photos/itarfoto/798248832/
For this one I compensated the exposure only a bit for
highlights:
http://www.flickr.com/photos/itarfoto/2350071738/
Carlos
The idea of the Norwood type meter is that you can make
three types of measurements with it. Namely reflected light,
narrow angle incident light, and wide area averaged incident
light. Any reflected light meter can be used close up for
the equivalent of what a spot meter does, but the spot meter
does it at a distance, which is useful for landscapes, etc.
The SEI meter was originally widely used in television work
where being able to measure at a distance was a great
convenience. I think they can still be serviced but haven't
looked recently.
The Weston meter came with instructions on how to use it
for measuring scene contrast using it close up. The markings
on the calculator are for setting high and low value light
readings to find the medium and the exposure point. Of
course, this measures reflected light which is a combination
of the light intensity and the reflectance of the subject.
The flat diffuser of the Norwood type allows direct
measurement of _lighing_ contrast, which can sometimes be
useful. Actually you can do this with any reflected light
meter and a reflecting card. The card does not have to be
18% gray since you are measureing the ratio of light coming
from different directions rather than the absolute amount. I
think the flat diffuser on the Norwood/Sekonic meter
probably reads the equivalent of an 18% gray card. In any
case, the ability to measure lighting ratios is very useful
to those lighting movie or TV sets and I find it useful for
studio portraits.
Again, this is only a tool to get data to be applied to
some concept of the results one wants. Since exposure meters
make absolute measurements they are useful in establishing
correct exposure, whatever that turns out to be. The eye is
adaptive, in fact it is constantly adapting to variations in
image brightness, so its not a good exposure meter even with
aids like extinction type meters. Those who say they can
judge exposure by eye are often refering to familliar
conditions where the light is about the same all the time.
They just remember what was successful in the past.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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