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Thread: LED lighting for wet plate collodion

  1. #11
    Recovering Leica Addict seezee's Avatar
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    Re: LED lighting for wet plate collodion

    Quote Originally Posted by Mark Sawyer View Post
    I think it's not so much the intensity of the UV, which would be similar to or less than the sun's. It's the absence of white light to discourage one from staring directly into them. I'd agree with your original assessment, and stay away from LED's for just that reason.
    I think you may be onto something. I probably confused the logic for avoiding them, but UV LEDs (and fluorescents) are potentially dangerous to one's health, hence the stern warnings from the manufacturers and the goggles issued at tanning salons.
    "Never try to teach a pig to sing. It wastes your time and annoys the pig."

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  2. #12

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    Re: LED lighting for wet plate collodion

    I just finished a project where I shot 140 wet plate portraits in the studio. I never shoot indoors, always out in the sun, so I wanted to invest the least amount of money in lights. I bought two high powered LED floodlights at 6500K. These lights illuminated half a block in the promotional images however when I set them up they really weak and I quickly realized I needed a lot more light. I then built two sets of 4 foot florescent lights with 6 bulbs on each side for a total of 12 additional lights. My exposure was still 6 seconds at 4.5.

  3. #13
    Mark Sawyer's Avatar
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    Re: LED lighting for wet plate collodion

    The thing to understand about LED's is that they can emit a very pure, narrow wavelength. I have a bright cluster of 48 red LED's that I can shine into my silver bath at close range to inspect the plate as I pull it (watching for little floaties) without any fear of fogging because the wavelength emission is so narrow and pure. When working with high-power UV LED's, that means you can have a lot of intensity in the UV wavelength, which won't be very bright visually, yet could fry your eyes.

    My original response to Seezee was based on the thought, "well, it's no more UV-intense than the sun, which we deal with every day". But imagine if the sun was visually so dim that we could comfortably stare directly into it for long periods, yet it was still putting out the same volume of eye-damaging UV light. That's what you're dealing with when you use those pure UV LED's...

    All things considered, I'd stay away from the UV LED's.
    "I love my Verito lens, but I always have to sharpen everything in Photoshop..."

  4. #14

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    Re: LED lighting for wet plate collodion

    1. UV portion is almost useless - won`t pass through glass below 350nm. you need massive blue portion instead

    2. hybrid (custom wavelenghts) LED modules are best for this . I use hybrid aquarium LEDs with 5 channels (10000K+15000K+420nm+445nm+455nm) and can get to 1s@f5.6 with OWH

    with such short exposure time it would be possible to add two UV-channels - 360nm / 380nm or 380nm/400nm in place of those two white channels. and still you can light up the channels individually - blue/whites for setting things up and then blue+UV for exposure

  5. #15
    SE Penna.
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    Re: LED lighting for wet plate collodion

    What kind of studio strobe power is needed for an f/8 or f/11 exposure at head and shoulders portrait distance? Would 3600 W-s do the trick?

    I have never done wet plate.

  6. #16

    Re: LED lighting for wet plate collodion

    hey there i have a Hensel 3000ws head and for head and shoulder portrait with powersetting of p7.5 of p10 with aero ektar at f2.5 i got a good exposure why you want to shoot portrait f8 or f11? with p10 setting of my flash you feel the head and its VERY bright :-)

    cheers janosch

  7. #17
    SE Penna.
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    Re: LED lighting for wet plate collodion

    The interest in f/8 and f/11 exposure is more easily attained critical sharpness due to a bit more DOF.

  8. #18

    Re: LED lighting for wet plate collodion

    hm to me thats the beauty of LF :-) that razor thin DOF :-)

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