JandC Classic 100 Reciprocity

Discussion in 'B&W: Film, Paper, Chemistry' started by Will S, May 6, 2005.

  1. Will S

    Will S Member

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    Anyone know the reciprocity exposure compensation needed for JandC Classic 100? It seems high from what I'm seeing on my negs (4x5) at times of 1-4 seconds.

    Thanks,

    Will
     
  2. Andy Tymon

    Andy Tymon Member

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    Hi Will,
    I find that I have to rate it at 40 iso to get the zone iii values I prefer, thats with rodinal 1 to 50 with pyrocat hd i get an iso 50. As to reciprocity I always found just doubling the length of time in the 1 to 20 second range always worked for me. I don't know what type of pictures you are making,when I do still life i always have to remember to factor in bellows extention, I tend to overlook it in the heat of the picture making experience : ).
     
  3. Will S

    Will S Member

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    That's what I'm seeing too. 1 sec = 2 sec. 2 sec = 4 sec. Seems high, but if it works...

    Thanks,

    Will
     
  4. Donald Qualls

    Donald Qualls Member

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    Seems to me J&C has suggested, over on the Sponsors' Forum, that the reciprocity table for APX 100 would work for Pro 100 (as will the developing starting times).