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DIY UV-pass filters for ultraviolet photo

Discussion in 'Accessories' started by PhotoDmiK, Jun 10, 2015.

  1. PhotoDmiK

    PhotoDmiK Mu-43 Regular

    83
    May 26, 2015
    Today I received parcel with ZWB1, ZWB2, ZWB3 and QB21 glass from Haian Optical Glass Factory:

    0_18c524_802813fe_XXXL.

    I had plan to replace glass on unused cheap UV/CFL filters with new UV-pass glass:

    0_18c525_8d722be5_XXXL.

    Closer look at disassembled filter frame:

    0_18c526_b545c07c_XXXL.

    New ZWB1 37mm filter assembled:

    0_18c527_d0ca20f5_XXXL.

    Unfortunately, new glass is 2mm thick, old glass was 1mm thick, filter frame is slim sized. I can't stack both ZWB1+QB21 to take any UV-only photo yet.
    QB21 is required to cut IR leaks from ZWB1, ZWB2, ZWB3 spectrum.

    Stay tuned.
     
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  2. PhotoDmiK

    PhotoDmiK Mu-43 Regular

    83
    May 26, 2015
    Any ideas where to find thick filters to fit 2mm glass? All new filters are in modern slim design :crying:
     
  3. tradesmith45

    tradesmith45 Mu-43 All-Pro

    Dec 13, 2012
    Oregon
    What filter size are you looking for, 37mm? My local camera store has gobs of old filter. Maybe..............?
     
  4. eteless

    eteless Mu-43 All-Pro

    Jun 20, 2014
    I know Formatt Hitech make filter rings with extra thickness to support thick glass however I'm unsure if they sell them without glass inside them, I'm also unsure about smaller sizes as I only really use the larger ones. They're also kind of expensive.

    The thicker 62mm filter ring can pretty easily take up to 7mm of glass for example, I'm unsure if they would even make rings of the same type in smaller sizes as they would probably cause heavy vignetting at this sort of thickness...

    I actually use them as part of sort of hot mirror stack rather than UV pass, heavy UV and IR on lenses which are not corrected for it such can be very ugly.
     
  5. PhotoDmiK

    PhotoDmiK Mu-43 Regular

    83
    May 26, 2015
    I ordered glass to use it on modern m4/3 lenses 37mm, 46mm, and just in case 55mm.
    I have old 49mm UV filter with 7mm frame and 3mm thread, 10mm total. New 4mm+1.5mm frames are too slim.

    One more idea is to use glue.
     
  6. budeny

    budeny Mu-43 All-Pro

    Mar 4, 2014
    Boulder, CO
    stack two - use second filter ring instead of the retention ring
     
  7. PhotoDmiK

    PhotoDmiK Mu-43 Regular

    83
    May 26, 2015
    I tried this - need to place shim between rings to secure glass. Keeping this as backup solution, need 2x more unused filter frames for that.
     
  8. Yelkrub

    Yelkrub Mu-43 Rookie

    21
    Apr 21, 2013
    Cheshire, U.K.
    Paul
  9. PhotoDmiK

    PhotoDmiK Mu-43 Regular

    83
    May 26, 2015
    Second try with suitable old soviet 46mm filters with 2.1mm thick glass:

    Before conversion
    0_1913c4_cf26cd_XXXL.

    Blue filter disassembled. Soviet blue filter looks same like QB21 in visible spectrum only. There was lot of invisible IR leaks.
    0_1913c5_be975755_XXXL.

    Yellow-Green filter disassembled
    0_1913c6_1de47d3f_XXXL.

    Conversion result with conversion tool on background.
    0_1913c7_39b8255_XXXL.

    Now waiting for sunny days :sleep:
     
  10. PhotoDmiK

    PhotoDmiK Mu-43 Regular

    83
    May 26, 2015
    Did some tests with mZD 45/1.8 lens and filters. There is very high IR leak, need to completely wipe red channel to see UV.

    qb21+zwb1
    0_191c26_ea9b5714_M.

    qb21+zwb1, red-200
    0_191c2c_c1849387_M.

    qb21
    0_191c27_396e477d_M.

    qb21+zwb1
    0_191c28_d9b95e7d_M.

    qb21+zwb1, red-200
    0_191c2d_3d0296f4_M.

    qb21
    0_191c29_d6f86c43_M.

    qb21+zwb1
    0_191c2a_4cc2a2a0_M.

    qb21+zwb1, red-200
    0_191c2e_3dafbb08_M.

    qb21
    0_191c2b_ecb688be_M.
     
  11. Petrochemist

    Petrochemist Mu-43 Top Veteran

    652
    Mar 21, 2013
    N Essex, UK
    Mike
    I've briefly tried UV imaging too, with as yet no success.
    From what I've red on-line Copper sulfate solution is very good at blocking the NIR that leaks through U330/U340... filters. Above ~800mn IR is captured by all three visual channels on my full spectrum converted camera just ditching the red channel won't prevent IR contamination.
    I eventually managed to track down some UV transmitting acrylic to make my own CuSO4 filter (I have access to high purity water & CuSO4 via work). Sometime I'll get round to putting it together - even then I'll have to be very selective of which lens I use all my native lenses block UV very effectively!
     
  12. PhotoDmiK

    PhotoDmiK Mu-43 Regular

    83
    May 26, 2015
    I going to test new filters on industar-50 lens, it had reasonable good results on unknown small frame less 20mm filters I had.
    Need 35.5mm step-up ring and sunny weather.