Goofy question for Ilford Expert(s)

Discussion in 'B&W: Film, Paper, Chemistry' started by wogster, Mar 23, 2009.

  1. wogster

    wogster Member

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    Just wondering something:

    When Ilford move from FP3 the next generation was FP4, similarly HP3 became HP4 and then HP5. So why was the next generation called FP4+ instead of FP5, and HP5 became HP5+ instead of HP6?

    Perhaps Simon or one of the other Ilford experts knows why....

    Been wondering this since getting back into photography...
     
  2. PHOTOTONE

    PHOTOTONE Member

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    I think the transition to the + versions of FP4 and HP5 were improvements that didn't affect the ISO rating of the film.
     
  3. cmacd123

    cmacd123 Subscriber

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    but HP4 was ISO 400 also was it not?
     
  4. wogster

    wogster Member

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    Apparently HP3 started at 125ASA, as H.P.3. then moved to 200ASA then 400ASA (still called HP3) then became HP4 then HP5 and now HP5+, still wondering why it isn't HP6?