Spectral Transmission of ILFORD SFX200 Filter
Does anyone have the Spectral Transmission data for
ILFORD's special SFX200 Filter?
My Hoya R72 cuts off light below 720nm, so the Ilford SFX filter would be around that area, I believe.
Originally Posted by Ilford SFX technical document
I recently bought some SFX200 to try with my Rolleiflex. Does anyone know if the Rollei IR filter is the same sort of filter factor?
[The little information I can find on-line seems to suggest it is].
Please don't hijack my thread!
Originally Posted by mcgrattan
I don't understand your question, but the filter factor for SFX is same as for Kodak's 89b which is 16 (a 4 stop increase).
I need the transmission data for Ilford SFX200 filter,
but if Rollei makes an IR filter, I would be interested any data on that too!
If you have a spare one I can get a rough transmission curve with the spectrometer here in the lab. Writing to Ilford might be easier though
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Last edited by Ray Rogers; 05-08-2009 at 12:08 AM. Click to view previous post history.
Here are the spectral curves for B+W IR filters from their filter handbook (downloadable from the Schneider website).
If B+W 092 is the same as your Ilford filter this should give you the info you need.
This as close as you get
SFX 200 has a peak red sensitivity at 720nm and
extended red sensitivity up to 740nm.
I was not aware of that site. Eons ago I bought a number of there special effect filters... nice to see they are still going!
I don't know if that filter is close to the SFX200 filter or not, but we may find out eventually, one way or another.
Anyway... it is still good to see B&W's data!
(OK... what is a wavefront distortion,
and why do I, the photographer, want to know about it? )
Someone mentioned asking Harman about their filter, but if they have just laid off 80 people, perhaps now is not the best time... I think thats like 20 to 25% of their workforce isn't it?
Originally Posted by Doremus Scudder
I looked at my own files and found this (Apug again...):