Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,761   Posts: 1,516,089   Online: 914
      
Results 1 to 3 of 3
  1. #1

    Join Date
    Jun 2005
    Location
    Kent, UK
    Shooter
    Multi Format
    Posts
    188
    Images
    13

    What could have caused this?

    Hi everyone - hope someone can help. I just received a set of prints (35mm NPS 160) back from my lab. About two thirds of the frames have red blobs / circles on the prints (they also appear on the negatives in cyan) and I am wondering what might have caused them.

    I attach an example photo. The red circle always appears along a central vertical line across the print in the portrait dimension, but the actual location along this line varies.

    I can't think it is a light leak on the camera as there is no effect on the edges on the frames. I have also tested the shutter for pin hole light leaks with a torch and it appears to be fine. Not all frames are affected and there seems to be no correlation between the length of time a frame was sitting in the camera before being shot.

    I notice on the negatives that even before frame 1 on the unexposed leader there appears these marks.

    Any thoughts or experience much appreciated. Thank you.
    Attached Thumbnails Attached Thumbnails Crayford Fields.jpg  

  2. #2
    David A. Goldfarb's Avatar
    Join Date
    Sep 2002
    Location
    Honolulu, Hawai'i
    Shooter
    Large Format
    Posts
    17,140
    Images
    20
    I'm guessing it's a lab issue, particularly if the negs were processed using a roller-processing minilab machine. If it was dip-and-dunk, then it's less likely a lab issue.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  3. #3

    Join Date
    Aug 2005
    Location
    Los Alamos, NM
    Shooter
    Multi Format
    Posts
    2,038
    If this appears on every frame at about the same spot, I doubt if it's the processing. I had a similar problem a while back while trying out a cheap Russian knockoff of the old Leica. It turned out to be caused the seating of the lens, or rather by its lack of proper seating. Look for ways that a dim spot of unfocused light could have fallen on the film frame. Leaks and reflections would be my primary suspects.



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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