Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,955   Posts: 1,586,029   Online: 745
      
Page 2 of 2 FirstFirst 12
Results 11 to 13 of 13
  1. #11

    Join Date
    Apr 2008
    Location
    Los Angeles, CA
    Shooter
    Multi Format
    Posts
    8,021
    Images
    4
    Quote Originally Posted by Maris View Post
    ...I could see (sort of very faintly) through these filters when inspecting a sunlit landscape...
    Just FYI, you can say the same thing about a Hoya R72. You can see the extremes of light and dark through them, especially if you block out all extraneous light and let your eyes adjust. Skies go black, making clouds pop, and grass and trees appear light.

    Any exposure of a panchromatic film with these filters in place means one of two things (or both):

    1. The filter is not doing its job of cutting off certain wavelengths at 100% (and few filters do). Some light that should theoretically be blocked is making it through. In long enough exposures, this may be enough to actually give the film some density, as you have experienced.

    2. The film is responding mildly to wavelengths beyond its stated spectral sensitivity, which stacks up in a long exposure.

    Number one seems far more likely to me...but I suppose there might be a possibility of number two happening, for some odd reason of which I am not aware.

    To the OP, there is a 4x4 Lee #87C gel filter from Freestyle for about $30. The filter cuts off at 775 nM instead of 720 nM like the R72, so aside from the aforementioned "leakage" it would not work with Ilford SFX, but would be fine with IR820C, Rollei IR, or HIE (if you still have any). If you don't want to go the whole route of getting a square filter holder and what not, you could cut this into a 77mm diameter and pop it on top of a clear filter, or remove the glass and replace it with the gel filter.

    http://www.freestylephoto.biz/533100...0x100mm-Opaque
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

  2. #12

    Join Date
    Mar 2010
    Shooter
    Medium Format
    Posts
    1
    I'm personally are using only Chinese filters like: UV, CPL, Soft Focus, Infrared.
    Because i spend all my money in cameras, lenses, not in filters.
    Look for personal use like hobby this filters do this job great, but for professional use you must buy better filters like Hoya.
    I have publish one photo created using cheap chinese IR720 filter, here:
    http://xr-photo.blogspot.com/2010/01...wallpaper.html

  3. #13

    Join Date
    Apr 2008
    Location
    Los Angeles, CA
    Shooter
    Multi Format
    Posts
    8,021
    Images
    4
    Quote Originally Posted by thracian View Post
    I'm personally are using only Chinese filters like: UV, CPL, Soft Focus, Infrared.
    Because i spend all my money in cameras, lenses, not in filters.
    Look for personal use like hobby this filters do this job great, but for professional use you must buy better filters like Hoya.
    I have publish one photo created using cheap chinese IR720 filter, here:
    http://xr-photo.blogspot.com/2010/01...wallpaper.html
    Thanks for the example.

    What I would like to see is the Chinese-made filter compared to a Hoya filter.
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

Page 2 of 2 FirstFirst 12


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin