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Thread: What aperture is 2.8.2?

  1. #11

    Join Date
    Jul 2007
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    near Seattle, WA
    Posts
    816

    Re: What aperture is 2.8.2?

    Quote Originally Posted by Bob Salomon View Post
    To be a little more precise, a shutter’s speeds are accurate if they are +\- 30% of the marked speeds.
    Shutter speed tolerances according to Flutot's Camera Repair are shown here.

  2. #12

    Join Date
    Sep 1998
    Location
    GA
    Posts
    10,925

    Re: What aperture is 2.8.2?

    Quote Originally Posted by Jerry Bodine View Post
    Shutter speed tolerances according to Flutot's Camera Repair are shown here.
    Since we were the Rollei, Minox, Linhof and Rodenstock distributor we didnít use Carol, we used the various factories and they all stated 30%.

  3. #13

    Join Date
    Nov 1999
    Location
    San Clemente, California
    Posts
    3,223

    Re: What aperture is 2.8.2?

    Quote Originally Posted by Eric Woodbury View Post
    ...I have this meter and the little ON switch was always sliding on and battery dead. Then I taped the switch off and the battery still seems to die, so now I remove the battery and tape it to the bottom of the meter for when I need it...
    Eric, even you couldn't get a Pocket Spot?

  4. #14

    Join Date
    Oct 2016
    Location
    Chicago
    Posts
    22

    Re: What aperture is 2.8.2?

    Yíall are right, Iím not trying to be super accurate. I tend to round up a lot for exposure and yes, lens specs are rounded up or down, the real focal length, the true aperture. Just wondered why there were two standards for lenses. Still, would be handy to have a list of actual aperture size for reference in 1/10 stop increments.

  5. #15

    Join Date
    May 2015
    Location
    SooooCal/LA USA
    Posts
    1,274

    Re: What aperture is 2.8.2?

    Quote Originally Posted by rbp View Post
    Y’all are right, I’m not trying to be super accurate. I tend to round up a lot for exposure and yes, lens specs are rounded up or down, the real focal length, the true aperture. Just wondered why there were two standards for lenses. Still, would be handy to have a list of actual aperture size for reference in 1/10 stop increments.
    Not rocket science... 5/10's is a half stop, but for something critical like on the edge of a white background, 1/10 would not be seen by LF chrome film, but 2/10's would start to be visible... Between 3 and 4 10's is a third of a stop, so that's a guide for you...

    Happy metering!!!

    Steve K

  6. #16

    Join Date
    Oct 2016
    Location
    Chicago
    Posts
    22

    Re: What aperture is 2.8.2?

    Not rocket science indeed. Here are the multiply factors to get the aperture in 1/10 of a stop. After that are are the common maximum apertures of older lenses, and their decimal equivalent.

    .0414 - .1 stop
    .082 - .2 stop
    .1242 - .3 stop
    .1656 - .4 stop
    .207 - .5 stop
    .2484 - .6 stop
    .2898 - .7 stop
    .3312 - .8 stop
    .3726 - .9 stop
    .414 - 1 stop

    3.5 - 2.8/6
    4.5 - 4/3
    4.7 - 4/4
    6.3 - 5.6/3
    6.8 - 5.6/5
    7.7 - 5.6/9
    9 - 8/3
    12.5 - 11/3

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