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Thread: Collodion - Wet Plate Images

  1. #1931
    Tin Can's Avatar
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    Re: Collodion - Wet Plate Images

    Like!

    How long was the exposure?


    Quote Originally Posted by paulbarden View Post
    I've discovered that there is about 40 minutes between 7 and 8 PM where there is a change in the light in the back room that is a happy blend of bright specular light and fluttering shadow. Making use of this window (in both senses) results in pieces like this one. I like where this is taking me. 5x7 tintype, using very old "Coffer's #7" collodion, developed as a positive. Unbranded 5x7 camera fitted with the Voigtlander Petzval lens.

    sin eater

  2. #1932

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    Re: Collodion - Wet Plate Images

    "Mia." From my ongoing series, Tompkins Square Park Portraits. 5x7 tintype, Eckhardt 3B lens, 4 seconds @ f5.6

    Click image for larger version. 

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  3. #1933

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    Re: Collodion - Wet Plate Images

    Quote Originally Posted by Randy Moe View Post
    Like!

    How long was the exposure?
    Hi Randy, sorry I missed your question till this evening.
    I recall that exposure was somewhere around 3 minutes. Glad you like it, thanks!

    Paul

  4. #1934
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    Re: Collodion - Wet Plate Images

    Thank you for your reply.

    I was unaware a wet plate exposure could be that long.

    I thought it would dry too quickly and be ruined.
    sin eater

  5. #1935

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    Re: Collodion - Wet Plate Images

    Quote Originally Posted by Randy Moe View Post
    Thank you for your reply.

    I was unaware a wet plate exposure could be that long.

    I thought it would dry too quickly and be ruined.
    Under the right atmospheric conditions you can get away with exposures this long. My "personal best" was 6 minutes on a cool summer night. After the plate comes out of the silver bath it's saturated mostly by water which evaporates much slower than the ether and alcohol in the collodion after the initial pour to coat the plate.

    A neat trick I just read about for anyone interested, is on a warm day you can lay a piece of plastic something inside the bellows and set a damp paper towel on it for the duration of the exposure. Works for the crazy folks who do wet plate pinholes As the sun or ambient heat warms the bellows it creates the humidity inside needed to keep the plate wet.

  6. #1936
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    Re: Collodion - Wet Plate Images

    That's an interesting idea. I'll have to mention that to my friend. We've done plates out in 95+ degree heat in the south. Of course the humidity outside is already 90% or higher anyway.

    We have had issues with developer getting much too hot and developing too fast (a second or two and it's starting to overdevelop).
    Bryan | Blog | YouTube | Instagram
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  7. #1937

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    Re: Collodion - Wet Plate Images

    Quote Originally Posted by Corran View Post
    That's an interesting idea. I'll have to mention that to my friend. We've done plates out in 95+ degree heat in the south. Of course the humidity outside is already 90% or higher anyway.

    We have had issues with developer getting much too hot and developing too fast (a second or two and it's starting to overdevelop).
    The developer works best between 60 and 72F, so if I travel to make collodion negs/tintypes, I take a cooler full of ice as well, to chill the developer.

  8. #1938

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    Re: Collodion - Wet Plate Images

    Quote Originally Posted by Randy Moe View Post
    Thank you for your reply.

    I was unaware a wet plate exposure could be that long.

    I thought it would dry too quickly and be ruined.
    Three minutes is a walk in the park! During the cooler half of the year, I have managed exposures up to ten minutes without adverse effect. But you won't get away with that on a day when it hits 95F with 10% RH!

  9. #1939
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    Re: Collodion - Wet Plate Images

    Quote Originally Posted by paulbarden View Post
    I take a cooler full of ice as well, to chill the developer.
    Well that's good for about 10 minutes in the deep south summer .
    Bryan | Blog | YouTube | Instagram
    All comments and thoughtful critique welcome

  10. #1940

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    Re: Collodion - Wet Plate Images

    Passiflora #1
    Wet plate collodion on glass (as a negative), 5x7 inches, made with a Voigtlander Petzval lens and a home-made waterhouse stop of indeterminate f-stop.


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