Edmund Optical lists Kodak Wratten No 87 and 87C filters on their
web site $175 each!!!. B&H has them for only $95 each. Hoya also
lists IR filters. Prices are lower depending on size, $40 to $70.
However, I did not try to fine the spectral curves for the Hoya filter.
The 87C is the one that cuts off well below visible light. Things have
changed a bit.
I no longer remember who Kodak contracted with to make Wratten
filters but I doubt if Kodak still makes them. For some reason I think
Tiffen rather than Harrison. Once upon a time, and until around the
late 1940s Kodak Research Labs made all the filters. The filters and the
name Wratten go far back in the history of Eastman Kodak.
On 4/30/2016 2:38 PM, Chauncey Walden wrote:
On 4/30/2016 1:35 PM, Richard Lahrson wrote:
Hi,The least expensive IR filters I sourced fairly recently were from a California maker who supplied movies. The name escapes me for the moment but I'm sure Richard Knoppow would know. Is it Harrison?
Rumaging through the freeze I found some
some Fuji Infrared sheet film. I won the auction
for 50 sheets of 11x14. It's already been cut
to 8x10 and 5x7 plus even some 2 1/4 by 3 1/4
that fits the sheet film adapter for my Mamyaflex
twin lens camera.
In Kodak's Photographic Filters Handbook,
it graphs 6 filters. The two I have, 87A and 87B,
are the sharpest cutting. The 87A needing 40X to
64X exposure increase.
Gad, I just checked B&H, new 3" infrared are
$95.95. If anyone wants my unsealed 87B I'll
take $25. In cave man days didn't they cost six bucks?
I have a red 29. Probably a red 25 would be better
but I don't have that. If anyone has an unsealed 25,
I'll trade the 87B for it even.
Rich
Chauncey
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