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Thread: Film Development Testing Question

  1. #21

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    Re: Film Development Testing Question

    Quote Originally Posted by Paul Kinzer View Post
    Great suggestions! I'm feeling pretty good, too, that I've learned enough from my reading and other research to actually understand most of them!

    The flaws are in the glass of two lenses: some haze in one, and minor -- though not growing -- fungus in another.
    Haze will cut contrast and should be cleaned up before you base your development and exposure testing on shots using this lens. Fungus could too, though it's usually on the edges and not in the image path at normal apertures in my limited experience.

  2. #22

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    Re: Film Development Testing Question

    Yeah, I tried to clean it off. Unfortunately, it's internal. You really have to hold the lens at the right angle to see it, and even then it's not very apparent. It's a 135mm Fujinon W that I got very cheaply, specifically because of this minor haze.

    And, yes again on the fungus. It's some fine threads on both lens cells, but looks completely covered by f/11, so should not be a problem. But I may not be looking through it the way I ought to, so would like to see empirical evidence.

  3. #23

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    Re: Film Development Testing Question

    As long as you have a good lens, you are all set. Pick a film and determine your exposure and development as you like. The expose the lenses under study exactly the same, but using a selection of f-stops. You should be able to determine problems in the exposure or the resolution without even making prints -- just use a loupe or a reversed enlarging lens.

  4. #24
    Greg Davis's Avatar
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    Re: Film Development Testing Question

    Quote Originally Posted by xkaes View Post
    That's EXACTLY what I have done, and it works great. I just didn't know how to phrase it -- without pictures -- so that anyone would understand. The only problem I have had is the hole in the darkslide getting caught in the felt in the holder. But brute force works!
    Are the holes round? Square holes do get hung up on the light trap but round holes fare a little better.

  5. #25

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    Re: Film Development Testing Question

    Quote Originally Posted by Greg Davis View Post
    Are the holes round? Square holes do get hung up on the light trap but round holes fare a little better.
    My holes are round. I made the with one of those "door knob" drill set from the hardware store. I've filed them down to be smooth, but the felt in the holder points downward and catches. No big deal -- it's a scrap film holder.

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