Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,879   Posts: 1,520,413   Online: 977
      
Results 1 to 2 of 2
  1. #1

    Join Date
    Oct 2003
    Posts
    25

    Dallmeyer 3A / 3D

    What is the difference between a Dallmeyer 3A and a Dallmeyer 3D lens? I have done some web searching and all I was able to come up with is both are modifications of a Petzval design.

    Thanks,

    ....lyle

  2. #2
    smieglitz's Avatar
    Join Date
    Oct 2002
    Location
    Kalamazoo, Michigan, USA
    Shooter
    Large Format
    Posts
    1,863
    Images
    97
    From an old Anthony catalog the 3A was "of ordinary intensity or rapidity" with 12" rear focus for full-plate.

    The 3D had a smaller rear focus of 10.5" and was designated for either groups on full-plate or views on 8x10 being "entirely free from distortion and flare." Presumably this meant the 3A was faster and less corrected for spherical abberations, i.e., it gave rounder or more 3-dimensional looks to the portraits. I suspect the 3A was around f/3.8 (but listed as 12" focus & 4" element diameter) and the 3D around f/5 (10.5" focus & 2.125" diameter). The Lens Collector's Vade Mecum echoes those figures.

    Joe



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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