Re: infrared images

[Norman Lohstreter <petel@TENET.EDU>]

Kodak did indeed make (probably still does) 35mm IR film.  This film was
sensitive to the near IR region of the spectrum not the thermal IR.
With the appropriate filter you could shift the range of color recorded
from  ROYGBIV  to  IRROYG.  These photographs were used mostly for
detection of deseased folage and for some circulatory studies in
medicine.

The thermal IR photos that you have seen are taken with a special
thermal imager that operates at near cryogenic temperatures to eliminate
ambiant heat fogging of the image.  There should be someone with the
power company that can send you to a source to borrow (rent) one.  Power
companies generally have a thermal survey of the area served in order to
encourage homeowners of particularly leaky homes to insulate and reduce
heating bills.

Pete Lohstreter
(Former owner of H&L Photography)
Garland Texas



James McLean wrote:
> Jim Braunsdorf wrote:
> > What does is it take to take heat images of a house for example to show
> > heat leaks?  Is there an infrared sensitive film that can be loaded
> > into a regular 35 mm camera? Does it take a special camera?
>
> I once had a regular 35mm camera that had a lens with markings for
> focusing properly when taking IR pictures.  I assumed that IR film was
> available somewhere.  Since the camera was not bought for (nor ever used
> for) that purpose, I assume that the lens' IR capability was not
> particularly special.
>
> Of course, this is from memory, and it's possible I'm wrong about what
> the markings meant.
>
> --
> --James McLean
> jmclean@chem.ucsd.edu
> post doc
> UC San Diego, Chemistry