S8612 filter for shooting UV

Discussion in 'Black and White' started by tbyork2012, Sep 6, 2013.

  1. tbyork2012

    tbyork2012 Mu-43 Veteran

    213
    Nov 14, 2012
    Oxford, UK
    Hi,
    I managed to order a 1.5mm S8612 filter from UVIR optics, who sells quite a few rare filters on eBay. I have to say that this IR-block filter is fantastic at suppressing IR but letting more UV to pass through to the sensor and is one of the best filters for this purpose.

    I paired it with a U340 1mm filter, also bought from UVIR optics and the flowers below were shot using this stack.
    9682672646_2e7df0f431_b_d.

    9679439441_1e5e79b124_b_d.

    I bought these in 25.5mm filter sizes as it can be stacked into the Micro 4/3rds adapter which has both a c-mount and M42 female threads. And it works out much cheaper than the Baader U (less than half the price). And for those who have a UG1/11 or Hoya U340/350/360 filters at home, the S8612 could make these filters useful for shooting UV digitally by preventing IR from contaminating the image.

    BTW, the U340 if used alone can also function as an IR-pass filter to shoot in IR.

    Boon
     

    Attached Files:

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  2. tbyork2012

    tbyork2012 Mu-43 Veteran

    213
    Nov 14, 2012
    Oxford, UK
    Here are some comparison images of various UV-pass filters.

    First the visible light image:
    9693763094_93d4a90a51_b_d.

    Baader U:
    9690515195_a247a73580_b_d.

    U330+S8612:
    9693753150_11f1586d61_b_d.

    U340+S8612:
    9693756770_5ae86fba55_b_d.

    Boon
     

    Attached Files:

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  3. kds315

    kds315 Mu-43 Regular

    149
    Apr 6, 2010
    Weinheim, Germany
    Interesting comparison, thanks for sharing!
     
  4. kds315

    kds315 Mu-43 Regular

    149
    Apr 6, 2010
    Weinheim, Germany
    Steve, great to see you also here as Uvabgrir!
     
  5. kds315

    kds315 Mu-43 Regular

    149
    Apr 6, 2010
    Weinheim, Germany
    I was just wondering what the reasons might be .... sorry if I have hurt your feelings, wasn't intended of course!!

    But the graphs are nice and helpful to understand the transmission of these stacks.
    However judging from them about the colors to be expected cannot be done, as least not so easily.
     
  6. tbyork2012

    tbyork2012 Mu-43 Veteran

    213
    Nov 14, 2012
    Oxford, UK
    I used 2.5mm U330 + 1.5mm S8612. There is more IR-leak with a UG5 than with the U330.

    As you can see from the image using this stack that there isn't any visible IR-leak. The main issue with the U330 is some blue-leak, which is subject dependent.

    The Rudbeckia being a yellow flower, does not show any of the blue leak. But this will be a problem with Orchids. So the U330 + S8612 stack is a UV-pass filter, which you would use selectively, unless you wanted to get the extra blue color in the flower.
    Boon