Re: IR with no direct sunlight

[Robert Jander <rjander@xxxxx>]

David,

Thanks for your advice.

Robert Jander

"David J. Romano" schrieb:

> Robert,
> Infrared film really functions no different than any other film. Just as with
> regular film, photos taken in direct sunlight will have more contrast. With IR
> film this is still true, but with a more exaggerated effect. If you were to
> photograph with IR film on a bright sunny day, but in the shade, you would get
> pretty much the same effect as if it were an overcast day.  Since shorter
> wavelengths scatter more, areas in the shade are relatively blue, with very
> little IR.  This is one of the reasons why, in general, images on IR film are
> contrastier that with regular film, and why stronger filtration creates more
> contrast: because the shadows are deeper. Longer wavelength IR light scatters
> much less than visible light.
>
> Keep in mind the zone system: Expose for the shadows, develop for the
> highlights. If you photograph on a cloudy day with IR film and develop the same
> way as if it were a sunny day, the images will have low contrast. There will
> less "IR effect", even though all of the objects in the scene still have the
> same IR reflectivity. Try changing the development time to get the degree of
> contrast you need for one of your average scenes. Then try the same thing for a
> scene on a cloudy day. One nice thing about cloudy days is that the images tend
> to be easier to print and there is often a really nice separation of values in
> the clouds which can make a drab day look dramatic.
>
> Changing light conditions makes exposure and development more tricky, but more
> fun.  Personally, I prefer to underdevelop a little to prevent the specular
> highlights, the ones in direct sun, from blocking up. Then I print on grade 3 or
> 3 1/2 paper to get the contrast back. It is extremely rare for me to make a
> straight print from an IR negative. There is always some dodging and burning,
> often using mulitple filter grades in the same print.
>
> Dave
>
> Stan Patz wrote:
>
> > >I accidently deleted a message where someone told me that there is no
> > > >necessity
> > >to have bright sunlight in order to shoot IR photos. Can anyone tell >me
> > >more
> > >about his/her experiences under those conditions, some links with >photos
> > >would
> > >be great, too.
> >
> >
>
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