Re: IR Presentation Info

[Andrew Davidhazy <ANDPPH@xxxxxxxxxxxxxxxxxx>]

> I was just reminded tonight that I am scheduled to give a presentation to a
> local camera club on IR photography.  I plan to do most of the research in
> both Laura White's book and Joe Paduano's book/s.  Does anyone out there in
> IR land have some suggestions for such a 30 minute talk, given such a talk,
> have or know where to pull down some prepared info on the topic.

Mike,

I have given such a presentation many times but I generally concentrate more on
the "technical" side of things than possibly your audience might be interested
in. I usually include UV with the IR talk ... because there are similarities in
approach and application. 

In any case the presentation starts off with a review of light and the adjacent
wavelengths ... the spectrum. Then a brief "hint" as to the areas of the
spectrum the talk deals with and where the "tools" fall within in ... a general
view of film spectral sensitivity (blue sensitive, panchromatic and ir) ,
filter spectral transmission (UV sources, 18A, 2E, IR blocking blue-green
filter and then the 87, 87C, etc ir filters). Before I forget, throughout the
talk there is an emphasis on understanding the spectral emission of sources,
the spectral reflection of subjects, the spectral transmission of lenses and
filters and the spectral sensitivity or response of the detectors or film
material. Spectral ... that's where it is at!

I review the manner in which photographers use filters for tone control when
using B&W materials and then go on to "extend" the concept to uv and ir
wavelengths and essentially point out that one can think of these ase just
another band of color (although one can not see those wavelengths). I point out
that color in ir can only be false and that most times it is appropriate to use
b&w material ... false color is a (powerful?) possibility but so it is in
"regular" photography too.
                                              
I also review the topic of spectral transmission of filters and lenses and
touch on pinholes and quartz and mirror lenses). Include the gamma-lambda
effect (film contrast vs. wavelength) and development corrective measures.
Discuss focusing concerns (simple lenses, achromats, apochromats and mirrors)
and practical solutions (like UV fluorescent groundglass and IR image
converters and now also readily available IR sensitive camcorders), viewing and
metering concerns (of course touching on action IR photography - use of
rangefinder, TLR and view cameras - and differences between metering and using
a filter factor vs. metering through ir filters and making a film speed index
adjustment), film handling and general processing considerations. 
                                    
I include examples from flash and tungsten applications for surveilance, IR
penetration of certain subjects for forensic and medical applications as well
as art history (allowing viewing below top layer of paintings ... sometimes).
Also, haze penetration and fabric and dye and transparent glass comparisons.

Discuss IR "luminescence" (or fluorescence in the  IR excited by visible) as
well as the Stokes effect, and I briefly touch on alternative methods for IR
imaging such as evaporography, extiction or reversal of a latent image by ir
exposure, thermal scanning cameras, etc.

This is all I remember right now (presentation is at school) but usually I take
about 1 1/2 hours to cover the material. Most of what I include in this
presentation is available on various articles I've placed on line. 
                                                                 
regards,

Andy  o o  0 0 o . o  Davidhazy, Imaging and Photo Tech
       \/\/\/\/\/\/          http://www.rit.edu/~andpph
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