Page 2 of 2 FirstFirst 12
Results 11 to 16 of 16

Thread: Measuring of Bellows for Exposure

  1. #11

    Join Date
    Sep 2004
    Location
    Chicagoland
    Posts
    438

    Re: Measuring of Bellows for Exposure

    It's been so long I can't remember who posted the .pdf, maybe Doremus but I printed the disc and ruler out on heavy card stock. Recently working with a model up close I had her hold the disc, I focused and measure on the ground glass with the ruler and voila, bellows compensation figured. All in 15 seconds.

  2. #12
    Mark Sawyer's Avatar
    Join Date
    Jul 2004
    Location
    Tucson, Arizona
    Posts
    5,136

    Re: Measuring of Bellows for Exposure

    Quote Originally Posted by Doremus Scudder View Post
    I simply made a chart that has all the lenses I commonly use on it with bellows extension factors and time/f-stop adjustments up to the longest bellows I own...
    Why not make a little chart for each lens translating each marked f/stop to its actual diameter? Then just measure the bellows extension and divide.
    "I love my Verito lens, but I always have to sharpen everything in Photoshop..."

  3. #13

    Join Date
    Jul 2007
    Location
    near Seattle, WA
    Posts
    767

    Re: Measuring of Bellows for Exposure

    I do exactly as the same as Doremus. I donít trust myself doing any multiplication or division quickly in the field, but Iím comfortable with ADDING corrections to the nearest 1/3 stop; a filter correction (in f-stops) is then added to the bellows extension correction. So my chart shows corrections as f-stops. Then after selecting the exposure time, if the situation calls for reciprocity correction, I have curves in my field notebook (pre-tested with my workflow for each of my films). These curves also note when N-minus development times are required to reduce the inevitable contrast increase. FWIW, for dim field conditions that make reading the charts difficult, I use a Fenix flashlight (3 different power levels) that is smaller than a partially burned cigarette (for size description only) that can be held in my teeth; itís also handy for seeing the lens controls.
    https://www.fenix-store.com/fenix-e0...ight-2014-edt/

  4. #14
    Rob Simmons
    Join Date
    Nov 2009
    Location
    Austin, Texas
    Posts
    28

    Re: Measuring of Bellows for Exposure

    Thanks for the answers. If you are an iPhone user and I would imagine android as well, Reciprocity Timer is great. You put the particular film you are shooting, add your filters, put the bellow length you are at, and then where you want your meter reading. So if you read 1 second at zone 7 then put 1 second in move it up to compensate for +2 stops and it will calculate the correct exposure with filters, bellows and any reciprocity. Plus once you shoot the timer will save the info you just did and you can snap a photo as well to show what you just shot.

  5. #15

    Join Date
    Jan 2002
    Location
    BesanÁon, France
    Posts
    1,495

    Re: Measuring of Bellows for Exposure

    Hi!

    Another way to compute bellows extension factors is to estimate the image magnification ratio.
    Using Philipp Salzgeber's Quick Disc, no computation is required, no electricity, no smart phone, no chart ...

    http://www.salzgeber.at/disc/

    This target and analogue ruler system computes bellows factors accurately for many view camera lenses, namely all quasi-symmetrical lenses.
    The exception being telephoto lenses for which bellows extension factors are given by a more complex formula, but I am not aware of many LF photographers using telephoto lenses for macro work!

  6. #16
    Cor's Avatar
    Join Date
    Nov 2006
    Location
    Leiden, The Netherlands
    Posts
    635

    Re: Measuring of Bellows for Exposure

    Quote Originally Posted by Emmanuel BIGLER View Post
    Hi!

    Another way to compute bellows extension factors is to estimate the image magnification ratio.
    Using Philipp Salzgeber's Quick Disc, no computation is required, no electricity, no smart phone, no chart ...

    http://www.salzgeber.at/disc/

    This target and analogue ruler system computes bellows factors accurately for many view camera lenses, namely all quasi-symmetrical lenses.
    The exception being telephoto lenses for which bellows extension factors are given by a more complex formula, but I am not aware of many LF photographers using telephoto lenses for macro work!
    Great tool..it is worthwhile to repeat the warning on the disc.....do not forget to remove the disc from the scene before exposure !...

    Best,

    Cor

Similar Threads

  1. Replies: 1
    Last Post: 17-Jan-2016, 08:59
  2. Help -- Exposure Compensation for Bellows
    By mediopollito in forum Cameras & Camera Accessories
    Replies: 34
    Last Post: 31-Dec-2015, 21:27
  3. Measuring exposure with new fangled cap
    By swmcl in forum Style & Technique
    Replies: 12
    Last Post: 18-May-2012, 21:12
  4. Technikardan - tips for measuring bellows ext.?
    By tadler in forum Cameras & Camera Accessories
    Replies: 6
    Last Post: 21-Nov-2011, 01:26
  5. Measuring bellows compensation factors
    By Tom_3925 in forum Style & Technique
    Replies: 10
    Last Post: 20-Jun-2005, 00:08

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •