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Thread: bellows factor app

  1. #31
    Drew Bedo's Avatar
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    Re: bellows factor app

    It all comes down to whatever works best for each individual photographer.

    I got into Large Format in parallel with entering a career working in Nuclear Medicine in the late 1980s. Nuc-Med involves imaging patients with isotope tracers and sophisticated computer driven equipment much like (but different from) CT and MRI imaging. At that time, the technology had not yet gone fully digital and we were using 8x10 B&W film in standard 8x10 LF film holders.

    I picked up a beaten but functional pre-anniversary Speed Graphic and cut down some film to start off. Then got a Kodak 2D in 8x10. I'd load up a couple of film holders on Friday and process the sheets in the clinic's automatic processor on Monday. I found that these two imaging modalities (LF film and Nuc-Med) were complimentary. My daily work was technology -intense and LF was low-tech but high-touch. I was attracted to the physical manipulation of the camera and other gear along with figuring out the variables that go into making an effective exposure.

    Perhaps that is what is behind my aversion to using an APP on a device to create and capture an image. Thats just me.

    If others need a device to facilitate their work flow and creative process then that is what works for them.

    The only thing that really matters is getting out and shooting.
    Drew Bedo
    www.quietlightphoto.com
    http://www.artsyhome.com/author/drew-bedo




    There are only three types of mounting flanges; too big, too small and wrong thread!

  2. #32
    Arca-Swiss
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    Re: bellows factor app

    You need only carry a pocket inch tape measure.

    When doing close-up work and your subject is closer than 8 times the focal length from the lens you will need to compensate for the extension. Take the focal length of the lens in inches and the length of the bellows in inches. Make the measurements unit the f-stop and judge what is the difference.
    I.e. 210mm lens = 8"(approximately}

    With a 16" extension of the bellows the extension factor would be 2 stops.
    210mm=8"=F8 16"extension =F16
    The difference between F8 and F16 is 2 stops.

    You should compensate as much as possible by shutter speed and deal with the fraction of a stop with the aperture.

    Hope this helps.

    Rod
    Rod Klukas
    US Representative
    Arca-Swiss International
    480-755-3364


    Digital Camera Solutions including R-series Technical Cameras, Large Format View Cameras and Ballheads. 480-755-3364

  3. #33

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    Re: bellows factor app

    Quote Originally Posted by Jim Michael View Post
    Just use f-stop inches. For an 8 inch lens (f8) open 1 stop at 11 (f11) and 2 stops at 16 (f16). Substitute f-stop cm as needed.
    this is by far the easiest, fastest method and the very last comment made two years ago. there was no need to resurrect this thread.

  4. #34
    Drew Bedo's Avatar
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    Re: bellows factor app

    I can't believe that this thread is still open.
    Drew Bedo
    www.quietlightphoto.com
    http://www.artsyhome.com/author/drew-bedo




    There are only three types of mounting flanges; too big, too small and wrong thread!

  5. #35

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    Re: bellows factor app

    Quote Originally Posted by Drew Bedo View Post
    I can't believe that this thread is still open.
    Generally speaking, most are no longer comfortable doing seemingly simple match calculations. How many elementary school students do you think have memorized the multiplication table?

    On a practical note: years ago I bought a used 5x7 field camera and the previous owner permanently attached a very thin adhesive ruler in both inches and mm - nice option to the ruler; I have been looking for the same for my 4x5 but have not found one.

  6. #36
    Land-Scapegrace Heroique's Avatar
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    Re: bellows factor app

    Quote Originally Posted by Renato Tonelli View Post
    Generally speaking, most are no longer comfortable doing seemingly simple match calculations. How many elementary school students do you think have memorized the multiplication table?
    Me, I love math, and I mean geometry, algebra, calculus, and more! You should have seen me shine in elementary school. Good thing I played sports, or I think I would have suffered abuse from the jocks.

    The love of math continues to this day. To be sure, I may be the first one to claim in this forum, right here, right now, that AA’s appendix in “The Camera” (with all those formulas, fractions, and equations) is one of my favorite sections!

    However, when it comes to bellows correction, I fall into the humble K.I.S.S. camp.

    That is, I don’t worry about bellows correction unless the distance to my subject is closer than 10x my focal length.

    When this happens, I’ll simply add 1/2 stop for every 25% increase in bellows extension (beyond infinity).

    Example: Let’s say I’m using my beloved Fuji A 240mm/9. 10 x 240mm = 2400mm (or 2.4 meters). So when my subject is closer than 2.4 meters from the camera, that triggers “bellows compensation” in my mind. And I’ll eyeball how much my bellows length has gone beyond infinity, and if necessary, add a suitable amount of light, usually in 1/2-stop increments.

    So maybe there's hope for the elementary kids you mention who'd rather avoid complex math but still be LFers. ;^)

    -----

    Adding exposure for bellows extension is rare for the type of landscapes I do, but whenever that moment comes, one extra thing I sometimes struggle to remember is to add yet more exposure for any reciprocity failure.

  7. #37

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    Re: bellows factor app

    Quote Originally Posted by Renato Tonelli View Post
    Generally speaking, most are no longer comfortable doing seemingly simple match calculations. How many elementary school students do you think have memorized the multiplication table?

    On a practical note: years ago I bought a used 5x7 field camera and the previous owner permanently attached a very thin adhesive ruler in both inches and mm - nice option to the ruler; I have been looking for the same for my 4x5 but have not found one.
    https://www.amazon.ca/s?k=adhesive&r...ref=nb_sb_noss

  8. #38

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    Re: bellows factor app

    Thank you. I will check it out.

  9. #39

    Re: bellows factor app

    Quote Originally Posted by CliftonGonzales View Post
    bellows element app works as well as yo whatsapp on android devices
    What relate this app which you are talking about in your post with bellows element app can you please described it because I don't understand what are you actually want to say about bellows element app...thanks...

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