Re: B&W IE

[George L Smyth <GLSmyth@xxxxxxx>]

Gavin Wrigley wrote:
> 
> I'm at a loss, I've so far tried 3 B&W's so far I've managed to
> overexpose each one. I'm using a Kodak Wratten 87 filter, could anyone
> supply my with suitable exposures for using the film on bright sunny,
> cloud free days.

What do you mean "3 B&W's"?  Assuming that you are using Kodak IR, meter
at EI250 through a #25 filter then open up 3-4 stops (that's what I
do).  Of course, if you know what EI you have been shooting at, increase
it a stop or two.  Bracketing also helps when you're just learning.

> Also, has anyone tried using the Wratten 87 filter with EktaChrome IE
> film ?

It's probably not a good idea, and here's why.  Common slide film has
three sensitized layers - blue, green and red.  Kodak's color IR film
sensitizes green, red, and infrared, where the green layer will show as
blue, the red layer will show as green, and the infrared layer will show
as red.  What you'll get is a red image.  This is why it is suggested
that you use a #12 deep yellow filter (which will block the blue
light).  Certainly, other filters may be used, but the #12 is a good
starting point.

george

-- 
 Handmade Photographic Images     
  http://www2.ari.net/glsmyth

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Topic No. 6