Re: night time infrared photography

[Richard Butler <rbutler@xxxxxxxxxxxxxx>]

Gavin Wrigley wrote:
> 
> >Gavin Wrigley wrote:
> >> 
> >> Quick question . . .
> >> 
> >> has anyone tried night time infrared photography??  Without a light
> >> source, any suggestions for exposure or filtration in either black and
> >> white or colour infrared??
> >> 
> >
> >Not sure, what you mean by "without a light source". You definitely need
> >some light source (electric lights, moon?) to take IR pics. It's a very
> >popular mistake that IR film could be used for night pics without
> >further illumination (in the visible or the IR spectrum)...
> >
> >In typical urban environments where there is a mixture of electric bulbs
> >(high amounts of IR) and neon lights (almost no IR emission at all), I
> >use HIE with a Wratten #25 red filter (maybe not really necessary?). I
> >set my camera's meter to ISO 250 and meter WITHOUT the filter in place.
> >TTL and through the filter, this roughly equals IS0 1000. The reason for
> >this procedure is that the light meter of the Minolta Dynax 600si I used
> >for most of my HIE night shots didn't give consistent results through
> >the red filter under such low light conditions. 
> >As usual, "your first film sould be a test roll", and BRACKET (+/- 2
> >stops on your first film).
> >
> 
> 
> I recieved an email from a military establishment asking for suggestions 
> about night time photography and asked if infrared would be suitable 
> medium, here's the edited highlights:
> 
> >Most of our 
> >photographic requirements are low light or nighttime assignments. Also, many
> >assignments 
> >are under water. We have used T-max 3200 pushed to extremes with extra long
> >exposures 
> >to get the job done but often long exposures just aren't practical due to
> >possiblility of 
> >detection. I would like to know if you feel that infrared would be the way
> >for us to go. If so, 
> >could you please give me some starting points (film types, filters,
> >exposures) and any other 
> >techniques that may help.
> 
> I didn't have much of a clue, which is why I thought I'd put the question 
> here for an answer.  I'll be passing on any info to them.  All the info 
> I've got is based on some form of IR illumination.
> 
> Thanks again!
> 
> TTFN
> Gavin
> 
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> 
Unless I am missing the point here, there is a big difference between 
night-vision instruments used by the Army and other military units and 
Infrared film which must have some type of light source.

Richard Butler

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