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IR films: Kodak HE vs. Konica 750?



 
 
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  #1  
Old September 26th 03, 11:45 PM
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Default IR films: Kodak HE vs. Konica 750?

I am interested in shooting infrared film with a 25A or 29 filter.

Can anyone please advise on the relative merits of the above two
films?

Also, how might they respond to a 70 filter?

Thank you for your reply.

Peter Nielsen
  #2  
Old September 27th 03, 12:12 AM
Ron Andrews
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Default IR films: Kodak HE vs. Konica 750?

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...
I am interested in shooting infrared film with a 25A or 29 filter.

Can anyone please advise on the relative merits of the above two
films?

Also, how might they respond to a 70 filter?

Thank you for your reply.

Peter Nielsen


The question is how much red light do you want the film to receive? A
W-23A will pass almost all red light and a little of the long green
wavelengths. W-25, W-29, and W-70 filters have longer and longer cutoff
frequencies. Here is a reasonable discussion:
http://www.pauck.de/marco/photo/infr...er/filter.html
This site has copies of the spectral curves of many of these filters (copied
from an old Kodak publication):
http://www.geocities.com/thombell/curves.html


 




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