Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,515   Posts: 1,543,726   Online: 898
      
Page 2 of 2 FirstFirst 12
Results 11 to 15 of 15
  1. #11
    keithwms's Avatar
    Join Date
    Oct 2006
    Location
    Charlottesville, Virginia
    Shooter
    Multi Format
    Posts
    6,079
    Blog Entries
    20
    Images
    129
    For my homemade apertures, I use developed (but not exposed) E6 film. It is quite nice and black.
    "Only dead fish follow the stream"

    [APUG Portfolio] [APUG Blog] [Website]

  2. #12
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,863
    Do you cut a hole in it, or do you take a picture of a circular spot?
    f/22 and be there.

  3. #13
    Mark Fisher's Avatar
    Join Date
    Dec 2003
    Location
    Chicago
    Shooter
    Medium Format
    Posts
    1,627
    Images
    151
    If it is a symmetric lens and you can get the aperture in the middle, you are all set. The downside is that it will be tough to focus with the small aperture. If it works out, maybe you can come up with an inexpensive old lens with a variable aperture.

  4. #14
    bowzart's Avatar
    Join Date
    May 2008
    Location
    Anacortes, WA
    Shooter
    Multi Format
    Posts
    1,217
    Images
    15
    Quote Originally Posted by Fleath View Post
    I don't remember the model, but at least one early Kodak camera used a simple lens with the stop in front of the lens to improve performance. Likely a single element lens, but it's a viable option. ...
    Examples I've seen in folding Kodaks, and the Ansco Sure Shot box camera, had simple meniscus lenses, convex side forward. With only one element, where else would you put it?

    Some of the Kodak folders had real f/stops, starting (if I recall correctly) at f/16 and getting smaller. In front was a restrictive disk which prevented the camera from being able to operate at wider apertures, although the aperture range was there. I imagine that this was to insure that the user would get sharp pix, because the lens is sharp in the center but has severe aberration if it is used farther out to the edges. I have removed this disk to see what it will do; I got the kind of image that was prized by the blurry pictorialist school around the turn of the 19-20th C's. I've got that camera somewhere still. It's kind of fun.

    These had no glass in front.

  5. #15

    Join Date
    Dec 2009
    Shooter
    4x5 Format
    Posts
    127
    I don't know a thing about your lens I'm afraid but I can tell you that I have a Mamiya RZ67 and the 180mm. lens has the shutter and diaphragm behind the lens. Was a big surprise to me when I bought it years ago! No glass behind the shutter at all!!

    Not sure how much help this is...

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