That makes sense. Is Chapter 17 "Eliminating Reflection with Twin Ring
Flash Systems Without the Aid of Modeling Lamps" by any chance?
Dean
-----Original Message-----
From: Walt Wayman [mailto:hiwayman@xxxxxxx]
Sent: Thursday, December 08, 2005 2:53 PM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Lighting question (Polarization)
>From out of the days of yesteryear, with a cloud of dust and a hearty
"Hi-ho silver-based film" comes the Lone Old Fart with a quote from Chapter
16, "Close-ups, Copying, and the Use of the View Camera," page 155, of the
1958 edition of "Graphic Graflex Photography," by Morgan & Morgan. Some
things never change.
"The reflection problem is more serious when the surface of the object being
copied is shiny but not flat; an example is a highly varnished oil painting
with bold, prominent brush strokes. Some glare will be found from parts of
the surface no matter what the angle of the lamps is, and the only solution
in such a case is the use of pola-screens. In mild cases of glare, a
pola-screen over the lens, angled correctly, may be all that is required.
For severe cases, it will be necessary to use polarizing filters over the
lamps as well, crossed with respect to the camera filter. This is
accomplished by placing the filters on the lights and viewing the subject
through the camera filer, then rotating the camera polarizer until all
reflections are eliminated. Only by the use of pola-screens over both lamps
and lens can reflections be eliminated completely, regardless of the type of
copy."
Walt
--
"Anything more than 500 yards from
the car just isn't photogenic." --
Edward Weston
-------------- Original message ----------------------
From: "Dean Tyler" <dtyler@xxxxxxxxxxxxxx>
>
> OK, now I have a question. I thought to idea of using polarized gels on
the
> light source required polarization on the lens. I have thought about
trying
> this a T28 twin flash, but I have always thought the light source would
need
> to be polarized in one direction and the lens needs to be polarized in the
> opposite direction to cancel the glare. This is most likely incorrect,
but
> I have been trying to think of ways to reduce glare in macro photography.
> Any help?
>
> Dean
-----Original Message-----
From: Piers Hemy [mailto:piers@xxxxxxxx]
Sent: Thursday, December 08, 2005 2:00 PM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Lighting question (Polarization)
I believe the theory is that you only need to polarize the source at right
angles to the reflecting plane to eliminate reflections. If you have a
polarizer on your lens using polarized light sources, you will surely
discover a variable ND filter system.
--
Piers
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