Spectral Transmission of ILFORD SFX200 Filter

Discussion in 'B&W: Film, Paper, Chemistry' started by Ray Rogers, May 7, 2009.

  1. Ray Rogers

    Ray Rogers Member

    Messages:
    1,555
    Joined:
    Aug 27, 2005
    Location:
    Earth
    Shooter:
    Multi Format
    Does anyone have the Spectral Transmission data for
    ILFORD's special SFX200 Filter?
     
  2. Alex Bishop-Thorpe

    Alex Bishop-Thorpe Member

    Messages:
    1,455
    Joined:
    Jul 6, 2006
    Location:
    Adelaide, So
    Shooter:
    Multi Format
    My Hoya R72 cuts off light below 720nm, so the Ilford SFX filter would be around that area, I believe.
     
  3. mcgrattan

    mcgrattan Member

    Messages:
    506
    Joined:
    Apr 5, 2005
    Location:
    Oxford, Engl
    Shooter:
    Medium Format
    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. Ray Rogers

    Ray Rogers Member

    Messages:
    1,555
    Joined:
    Aug 27, 2005
    Location:
    Earth
    Shooter:
    Multi Format
    Please don't hijack my thread! :D

    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. Tim Gray

    Tim Gray Member

    Messages:
    1,786
    Joined:
    Sep 2, 2006
    Location:
    OH
    Shooter:
    35mm
    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 :smile:
     
  6. Ray Rogers

    Ray Rogers Member

    Messages:
    1,555
    Joined:
    Aug 27, 2005
    Location:
    Earth
    Shooter:
    Multi Format
    If one turns up, I will keep you in mind :D

    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!

    :sad:
     
    Last edited by a moderator: May 8, 2009
  7. Doremus Scudder

    Doremus Scudder Member

    Messages:
    1,296
    Joined:
    Sep 10, 2002
    Location:
    Oregon and Austria
    Shooter:
    4x5 Format
    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 Files:

  8. oldfaithful58

    oldfaithful58 Member

    Messages:
    21
    Joined:
    Apr 6, 2008
    Location:
    Hull, UK
    Shooter:
    Multi Format

    Attached Files:

  9. Ray Rogers

    Ray Rogers Member

    Messages:
    1,555
    Joined:
    Aug 27, 2005
    Location:
    Earth
    Shooter:
    Multi Format
    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? :confused:smile:

    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?


     
  10. AgX

    AgX Member

    Messages:
    12,175
    Joined:
    Apr 5, 2007
    Location:
    Germany
    Shooter:
    Multi Format
  11. Ray Rogers

    Ray Rogers Member

    Messages:
    1,555
    Joined:
    Aug 27, 2005
    Location:
    Earth
    Shooter:
    Multi Format
    oldfaithful58,
    I appreciate your effort... but I guess you know I was asking about the filter which goes by the exact same name :surprised:

    The film spec sheet I have ... (the film I will have on Sunday!) All I need now is to make a final filter choice.... Thats why I'd like to see "SFX200 the filter" info... but it occurs to me that the data might not be published.

    Thanks, though.

    And thanks, AgX

     
    Last edited by a moderator: May 8, 2009