Re: IR and flash

[Ben Kreunen <ben@xxxxxxxxxxxxxxxxxxxxxxx>]

At 10:51 AM 3/30/00 +0100, you wrote:
>At 9:05 am -0700 29/3/00, Rod Sage wrote:
>
> >I was planning to take flash pictures with Konica 750. Would there be an
> >advantage to putting a red filter over the flash or should it be over
> >the lens over the lens? What would happen if I put a filter over both
> >flash and lens? I know the picture would be easier to compose if there
> >is no filter over the lens. Could someone point out a web site with
> >night flash examples?
> >
> >Rod

Time for some more lateral thinking....

You are planning to take picks in very low light...

The purpose of the filter in IR photography is primarily to block 'visible' 
light.

If there is very little visible light then there is no need for a filter.

If we now add a single filtered light source there is still no need for a 
filter on the lens.

IR filters do block some IR light so a filter over both lens and flash 
would be unnecessarily reducing the amount of IR reaching the film (even if 
it is only a little bit, it'll still be two times a little bit).

If there is no filter over the lens it may be still possible to just see 
enough through the view finder to compose (depending on how dark it is of 
course, what aperture your lens is, what type of screen you have etc....)

i.e. The best place for the filter is on your flash.

Now Konica IR (read "a sloooooooow film") at night with flash....  I hope 
everything's nice and close to the camera

Enjoy

Cheers

Ben

===================================
http://www.bigbenpublishing.com.au/
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