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  1. Replies
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    Re: out of focus

    Sébastien,

    I'll try to keep it simple.

    Front tilt moves the plane of focus from vertical toward horizontal. It is good for things like flat fields with no trees, etc.
    A tiny bit of front...
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    Re: Why TF-5 Fixer??

    If it is working-strength solution it may have gone bad. If you are referring to the concentrate, it will likely still be good.

    To test do two things. First pour a bit of the fixer into a clear...
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    1,914

    Re: Enlarge lens 150 vs 135

    I own both. An older El-Nikkor 150mm and a rather newer 135mm. Both deliver superb results. I use the 150 mostly, but switch without hesitation to the 135mm when I need to make a substantial crop...
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    Re: Brightness of ground glass

    Rick makes a good point. If there is a Fresnel screen of a focal length not well-suited to the lens focal length, there would be a definite hot spot.

    The OP, however, has what look like loading...
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    1,135

    Re: Fstop timing

    Apertures nowadays are marked in f-numbers. The "f" stands for "focal length." These numbers are always given as fractions of the focal length of the lens. f/8, therefore, means that the optical...
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    Re: Brightness of ground glass

    Good question. A photo of the set-up in action would help.

    Doremus
  7. Replies
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    784

    Re: Brightness of ground glasss

    The former seems to indicate that the bellows may have blocked the light, or maybe some other obstructions. The image canted on the film indicates that the film was improperly loaded in the holder,...
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    Re: Fstop timing

    Let's see... opening the aperture one stop doubles the amount of light hitting the paper. Decreasing it on stop halves the light hitting the paper.

    Therefore, closing one stop would require twice...
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    Re: Safe Light

    Some Foma papers (e.g., Fomabrom 111) need a red safelight; the amber ones (OC filter) fog them fairly rapidly.

    Using a red filter instead of an amber filter is fine; it's the shorter wavelengths...
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    Re: Brightness of ground glasss

    Let's see... There seems to be a 240mm Tele-Xenar telephoto that was designed for the 3 1/4" x 4 1/4" (90x120mm) film format. If that's what you have, it may not cover 4x5 completely; you'll see...
  11. Re: New Lens Scale: How To Convert Milliseconds To Standard Camera Fractions?

    Andrew,

    I'll just address your question to me. First, though, please note the correction in post #11, pointed out by acrobatic_citron (thanks a_c). I hope that didn't confuse the issue for you. ...
  12. Re: New Lens Scale: How To Convert Milliseconds To Standard Camera Fractions?

    Thanks for the correction! Typing too fast and not thinking clearly, obviously. Yes, f/22- , which is 1/3 stop more light than f/22.

    I apologize to the OP and the rest following this thread...
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    Re: Brightness of ground glasss

    Kino is right that we need more information. Kino is mistaken, however, that extending the bellows past infinity focus will reduce the image circle; just the opposite, extending the bellows...
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    Re: Fstop timing

    Thanks Peter!

    Glad you found the percentage method helpful. FWIW, I've standardized on just one sequence at 30% intervals (25% works too, but I've found that 30% is not too wide to be able to...
  15. Re: New Lens Scale: How To Convert Milliseconds To Standard Camera Fractions?

    Andy,

    There are a range of shutter speeds; some of them are off more than others, e.g., some are 2/3 stop too slow, some only 1/3 stop too slow. If you can get your head around my method, I'll do...
  16. Re: New Lens Scale: How To Convert Milliseconds To Standard Camera Fractions?

    Here's my table of shutter speeds in milliseconds with corresponding approximate 1/3-stop fractions.

    When I get my shutters tested, I convert the time in milliseconds to the closest 1/3-stop...
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    Re: Fstop timing

    I think we're talking about an 80 second exposure here, not 80 minutes, which is not all that uncommon with larger prints (still long, though).

    Monochromefan,

    F-stop timing really works better...
  18. Re: beseler 45MX condenser bellows vs focus bellows

    Not sure what you mean by the question. I posted information specific to Beseler 45M... series condenser enlargers regarding positioning of the upper bellows. Nothing whatsoever to do with the 23C...
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    Re: Grain Focuser

    If you're printing, you'll need a stop bath. I use Kodak Indicator Stop mixed as per instructions. I find it more economical than buying white vinegar, plus the indicator is nice (toss the stop...
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    Re: my show, "Bearing Witness"

    Gregg,

    Sorry to see you go! I'll see if I can make it over for the exhibit from Eugene, not sure I'll have the time, though.
    Love your work and the website.

    Doremus
  21. Replies
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    Re: Push and Pull

    Well, I should have qualified that statement with an "often." Certainly, if you test and know what your results are going to be, and if you understand the principles behind the terms well, then...
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    Re: Push and Pull

    Yep. It's a roll-film-get-the-shot-in-low-light thing. It's become enough of a "look" that some like it (and think it's technically good photography).

    Doremus
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    Re: Push and Pull

    I dislike the terms, period. Basically shorthand for sloppy guesswork.

    Doremus
  24. Re: Anyone Know the Type of Black Paint Used on Modern Omega 4x5 Negative Carriers?

    I'll second the suggestion for a good spray aluminum primer followed by a good-quality flat-black spray paint. I've done that with several negative carriers and have never had a scratching problem....
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    Re: Push and Pull

    The terms "push" and "pull" are inherently imprecise and fuzzy themselves. Most who use the terms "push" and "pull" use roll film cameras and in-camera meters.

    "Pushing" is most commonly regarded...
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    Re: Ansels The Negative

    Monochrome fan,

    Modify your approach to AA's book: Assume he knew what he was doing and that his descriptions are accurate and correct.

    Any confusion, therefore, is due to misunderstanding on...
  27. Re: beseler 45MX condenser bellows vs focus bellows

    Here's a positioning guide for the Beseler 45M condenser enlargers that I've compiled from various sources over the years. Possibly helpful here.

    Doremus
  28. Replies
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    Re: Film Problem with HP5 ?

    The rebates on the film look fairly clear, so you're not dealing with base fog.

    The Pyrocat negative is flatter than the HC-110 negative, but that's to be expected. The stain adds photinic...
  29. Re: “White” Panel LED Color Temperature W/VC Filters?

    John,

    Since you're planning on using a blue/green split printing technique, what really matters is that the panel you choose emits usable and fairly equal amounts of blue and green light. Take a...
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    Re: Age fog

    Bleach WILL affect the latent image. Check out SLIMT techniques, where a rehalogenating ferricyanide/bromide bleach is used to bleach the latent image contrastwise (works on film or paper). I've...
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    Re: Film holders: alternative to notches

    The options above all impinge a bit on the image area. That's fine if you can live with that. In that case, you could simply tape some transparent film to an appropriate part of the film holder and...
  32. Re: beseler 45MX condenser bellows vs focus bellows

    Just to clarify: If you are using the condenser light source, you need to adjust the upper bellows to the right height for the size of negative you are enlarging. Originally, the enlargers equipped...
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    Re: Post your churches

    Yes!
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    Re: indicator stop bath

    The Zone System works best with a spot meter for metering shadow values and with sheet film. With a sophisticated roll-film camera and matrix metering, I would approach exposure/development in a...
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    Re: indicator stop bath

    You should learn to be a bit more trusting. Why do you suspect that Ilford, a company that's been in business for decades, has a good reputation and is a leader in the industry, would sell you a...
  36. Re: Schneider Tele-Xenar 240mm f5.5 shutter question

    Does it cover 4x5?
  37. Re: bellows extension factor - getting the hang of it - any suggestions : )!!! ??

    It's exactly the same thing. Camera format or lens focal length make no difference to the inverse-square law. Once you extend the bellows away from infinity focus, the intensity of the light starts...
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    Re: Bridges

    Yes!
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    Re: Wista/Zone VI Manual

    Why not just link to it here in the forum? I'm sure there are no copyright issues anymore.
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    Re: filters and zone system

    General info here:

    Do all your exposure calculations and find the aperture/shutter-speed combination you want to use before worrying about filter factors.

    Then, decide which filter to use and...
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