Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,913   Posts: 1,584,696   Online: 668
      
Page 2 of 2 FirstFirst 12
Results 11 to 15 of 15
  1. #11
    Steve Smith's Avatar
    Join Date
    May 2006
    Location
    Ryde, Isle of Wight
    Shooter
    Medium Format
    Posts
    8,711
    Images
    122
    Quote Originally Posted by JBrunner View Post
    Far more of my negs are soft because I suck than because of diffraction. YMMV.
    I think that sums up my negatives too!


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  2. #12
    polyglot's Avatar
    Join Date
    Jun 2009
    Location
    South Australia
    Shooter
    Medium Format
    Posts
    3,341
    Images
    12
    Ralph: do you not mean 4x as much (linear) resolution at f/8 than f/32? I understood that at the diffraction limit, the diameter of the Airy disc to the first null is d=2.44*wavelength*Fnumber. Therefore at f/32, the airy disc is 4x the diameter than at f/8.

  3. #13
    RalphLambrecht's Avatar
    Join Date
    Sep 2003
    Location
    Central florida,USA
    Shooter
    Multi Format
    Posts
    6,840
    Images
    1
    Quote Originally Posted by polyglot View Post
    Ralph: do you not mean 4x as much (linear) resolution at f/8 than f/32? I understood that at the diffraction limit, the diameter of the Airy disc to the first null is d=2.44*wavelength*Fnumber. Therefore at f/32, the airy disc is 4x the diameter than at f/8.
    No, I said and meant 2x. I wasn't comparing theoretical diffraction limits (in which case you would be correct). I was comparing actual lens performance between these apertures as shown in my graph in post #5.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  4. #14
    polyglot's Avatar
    Join Date
    Jun 2009
    Location
    South Australia
    Shooter
    Medium Format
    Posts
    3,341
    Images
    12
    ah, fair enough.

  5. #15
    RMD
    RMD is offline

    Join Date
    Dec 2005
    Shooter
    35mm
    Posts
    38

Page 2 of 2 FirstFirst 12


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin