RE: Over/Underexposing due to wavelength?

[Andrew Davidhazy <ANDPPH@xxxxxxxxxxxxxxxxxx>]

> I remember reading somewhere that since infrared is way above the
> visible spectrum that there is no point in overexposing
> while bracketing.  Is this true?  What are the nm ratings for visible
> and IR light?  Thanks.

Jordan,

Over or underexposing has nothing to do with the wavelength of the spectrum
that one is making photographs in. It is simply a matter of achieving proper
or useful density levels with whatever the radiation happens to be you are
exposing the emulsion to.

In any case, what we call light has loose limits that extend from about 400 to
700 nanometers. Anything other than these wavelengths is invisible to us. Much
of what is left is also invisible to standard films and anything longer than
baout 1000 nm is invisible to Kodak's High Speeed Infrared film too. 

To see in those regions one would use image converters or thermal cameras (I
guess these are also image converters of sorts).

regards,

Andy  o o  0 0 o . o  Andrew Davidhazy, Imaging and Photo Tech
       \/\/\/\/\/\/   http://www.rit.edu/~andpph  716-475-2592  
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