DBI ~ What To Look For?

Discussion in 'B&W: Film, Paper, Chemistry' started by Jim Moore, Dec 30, 2004.

  1. Jim Moore

    Jim Moore Member

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    After reading Sean's thread, and the thread on the AZO forum about DBI with night vision goggles I have decided to order some and give it a try.

    My question is, when developing by inspection what do you look for to know that the negative is "done"?

    Thanks!

    Jim
     
  2. Jeremy

    Jeremy Member

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    Take a negative that prints very easily and well into the darkroom. Dunk it into some water and compare the developing negs with this one to see when the highlights are about the same. That's my suggestion...

    Personally I didn't have any negs to compare so I did a test with 6 negatives to see which film speed and developing time printed the best for a "normal" contrast scene and the next time I went into the dark I just judged based on what the previous negs looked like.

    The IR goggles also make loading film holders a snap!
     
  3. Jim Moore

    Jim Moore Member

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    Thanks Jeremy.

    Another reason I want to get one :tongue:

    Jim
     
  4. Jeremy

    Jeremy Member

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    Jim,
    I was able to load 36 sheets of 5x7 film in about 10 minutes with zero mistakes, it was great :smile:
     
  5. Peter Schrager

    Peter Schrager Subscriber

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    loading film

    Hey Jeremy-I can do the same loading trick with my eyes closed in the darkroom!
    Peter
     
  6. Jeremy

    Jeremy Member

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    Me too, but it takes me about 5 minutes/2 holders when I have to do it with my eyes closed :wink:
     
  7. Buster6X6

    Buster6X6 Member

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    Hi Jeremy
    What kind of night vision goggles did you buy? and how do you use them?Just curious.
    Greg
     
  8. eggshell

    eggshell Member

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  9. Christian Olivet

    Christian Olivet Member

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    J Moore, only working with TMY400 is worth the trouble of using IR goggles. Any other film can be easily inspected with a dim green light.
     
  10. Jeremy

    Jeremy Member

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    I really wouldn't call it trouble at all. It's like developing film with the room light on once you get used to it. The reason I started doing so is that I have weak night vision and was having trouble inspecting with the dim light.
     
  11. jim appleyard

    jim appleyard Member

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    Unblinkingeye.com has a good article on this as well.
     
  12. matt miller

    matt miller Subscriber

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    When I DBI I look at the base side by reflected light from the green safelight. The base side is a milky white color. Check the base side about half way through & you'll see the milky white color without any sign of highlights. Check again at predetermined intervals & you'll see the progression of the highlights getting darker through the milky white base. When my negs are done for Azo printing, the highlights are coming through fairly strong, but not too much. I had to develop & print a few to get comfortable with judging the highlight density I wanted for Azo. It's a lot of fun. The IR goggles really sound like fun.
     
  13. Flotsam

    Flotsam Member

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    I can't even judge my prints under the safelights.
    Film dev. is Time/Temp. all the way for me.
     
  14. Ole

    Ole Moderator Staff Member Moderator

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    There's a difference depending on the developer. Non-solvent developers were called surface developers for a good reason: The emulsion side turns black long before you see anything through the base. So you should know what to expect with the developer you use...