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  1. #1

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    Spectral Transmission of ILFORD SFX200 Filter

    Does anyone have the Spectral Transmission data for
    ILFORD's special SFX200 Filter?

  2. #2
    Alex Bishop-Thorpe's Avatar
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    Quote Originally Posted by Ilford SFX technical document
    Very deep red
    ILFORD SFX, B+W RG665, B+W 092, Heliopan 695
    and 715, Hoya R72 and Kodak Wratten 89B. These
    filters give an even more dramatic effect than deep red
    filters. However, exposure times with these filters can be
    very long, so the use of a tripod is recommended.
    My Hoya R72 cuts off light below 720nm, so the Ilford SFX filter would be around that area, I believe.
    The Analogue Laboratory, or 'so you built a darkroom in an old factory in the industrial zone'.
    Blog thing!.

    Worry less. Photograph more.

  3. #3

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    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].

  4. #4

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    Quote Originally Posted by mcgrattan View Post
    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!

    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!

  5. #5

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    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

  6. #6

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    Quote Originally Posted by Tim Gray View Post
    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
    If one turns up, I will keep you in mind

    Unfortunately, neither option will be in the nick of time.

    If Ilford wanted us to know, I guess they would have put the info on their web or at least... in the box with the film or Hey! with the filter itself!

    Last edited by Ray Rogers; 05-08-2009 at 01:08 AM. Click to view previous post history.

  7. #7

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    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.

    Best

    Doremus Scudder
    www.DoremusScudder.com
    Attached Thumbnails Attached Thumbnails IRFiltersSpectra.jpg  

  8. #8

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    This as close as you get
    http://www.ilfordphoto.com/Webfiles/...1134552223.pdf
    SFX 200 has a peak red sensitivity at 720nm and
    extended red sensitivity up to 740nm.
    Attached Thumbnails Attached Thumbnails SFX-spectra.jpg  

  9. #9

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    Doremus,

    Thanks.

    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?


    Quote Originally Posted by Doremus Scudder View Post
    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.

    Best

    Doremus Scudder
    www.DoremusScudder.com

  10. #10
    AgX
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    Ray,

    I looked at my own files and found this (Apug again...):

    http://www.apug.org/forums/450565-post3.html

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