Pan B and Pan C

Discussion in 'B&W: Film, Paper, Chemistry' started by Eric Rose, Mar 29, 2003.

  1. Eric Rose

    Eric Rose Subscriber

    Nov 21, 2002
    Calgary AB,
    4x5 Format
    I was looking thru some old kodak publications and they made mention of their panchromatic emulsions being classified as either Pan B or Pan C. Films such as Panatomic X, Plus X and Super XX sheet films were classified as Pan B. Pan C films were among others, Super XX roll and Tri-X.

    In most cases the filter factors were identical but a major exception was with red and deep red filters.

    I suppose with the advent of the new emulsions these old categories don't exist, but I was wondering if people still see a major difference in filter factors between Plus X and Tri X when using a red filter.

    What's your experience? How about FP4 and HP5?

  2. Robert

    Robert Member

    Sep 10, 2002
    Wouldn't this just be related to red sensitivity? I wonder if these docs date from the time film moved from being Ortho only to being pan? Also isn't Techpan different in it's red sensitivity?