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Anyone have experience shooting florescent?

Discussion in 'Tips and Techniques' started by M DeM, Jul 22, 2019.

  1. M DeM

    M DeM Barracuda

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    I've read some "how-to's" on it, and I know what's needed (yellow barrier filter and blue filter)

    Since I can't afford the real deal, I'm going to try some guy's DIY get up. (here's the link if anyone's interested: DIY Underwater Fluorescence Filters)

    I was just curious if anyone has had a bad/decent/good time doing this, and specifically is there any issues with focus, the way there is when you shoot infrared.

    Thanks!
     
  2. GJC

    GJC Solo Diver

    # of Dives: 100 - 199
    Location: Southern California, USA
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    The plastic filters scratch easily and are fragile if you try to cut them yourself. I broke one cutting it with a fine saw. So do everything you can to protect them from scratches and bumps.

    I use a UV light, so don't have experience with blue filters.

    I didn't find the yellow filter helpful at night using UV light. When shooting at night, I'm mostly interested in the florescent colors. Yellow filters will correct background color with ambient or white background light.

    I haven't noticed focus issues.
     
    M DeM likes this.
  3. bvanant

    bvanant Loggerhead Turtle

    # of Dives:
    Location: Los Angeles (more or less)
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    It is easy to get filters for the camera end. Getting high throughput excitation filters though is much more difficult. The dark blue acrylic will not let you get much in the red side of the fluorescence spectrum but is good for greens.
    Bill
     
    M DeM likes this.
  4. M DeM

    M DeM Barracuda

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    I was wondering about that. Especially since it has to be a fairly dark blue...
     
  5. M DeM

    M DeM Barracuda

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    fortunately I've got a place right by me that cuts acrylic for cheap!
     
  6. M DeM

    M DeM Barracuda

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    VERDICT!

    The cheapo way I did was horrid. Nothing was clear through the acrylic - looked like we were swimming through pee.
     
  7. kelemvor

    kelemvor Big Fleshy Monster ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: Largo, FL USA
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    I haven't used DIY filters, but I have used a blue light with yellow ikelite filters and I've also use a standard UV light. I greatly prefer using blue+yellow filter vs UV.

    @M DeM, check Ikelite for filters. They aren't particularly expensive. I've got one ikelite mask filter, one knockoff mask filter, and a knockoff filter for a gopro. The trick is that you need the correct yellow to match the wavelength of your blue light. Yes, you could just strap a mask filter onto the front of your camera if you wanted to. Might be worth cutting it up with a hacksaw or dremel tool first if you're going to do that.

    Most fluorescent colors fluoresce a lot more with blue (440-485nm) than with UV (380-440nm).

    Good reading on the subject: Fascinating Fluoro Photography

    Blue vs UV: Why NIGHTSEA uses Blue Light for Underwater Fluorescence - NIGHTSEA

    You might have just got ahold of some crappy acrylic and/or it wasn't quite the right color. The brand name filters are around $50 and the brand name blue lights are under $100. I think I got the knockoff filters on amazon for closer to $25.
     
  8. M DeM

    M DeM Barracuda

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    This is helpful stuff. And I think you're probably right about the crappy acrylic.... I'm going to go read that article right now!
     

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