Re: HP5, Delta films and reciprocity

I use the same formula as I do for TMAX. The other forgiving factor is that when you correct for reciprocity failure, the failure itself buffers overexposure risk. Don't try to hit a mark too closely. Overexposure may be a wrong, but it's only a misdemeanor. Underexposure is a felony.
  ----- Original Message -----
  From: BWPHOTO4527@aol.com
  To: pinhole-discussion@pinhole.com
  Sent: Friday, July 19, 2002 10:26 PM
  Subject: [pinhole-discussion] HP5, Delta films and reciprocity

  OK,

  This has probably been discussed recently, but can anyone out there recommend a good formula/rule of thumb for adjusting exposure for reciprocity in Ilford films? The technical data on their webpage is merely a chart, and I am hoping to get more specific information, based on the experience of the other pinhole photographers on the list.

  I normally use Delta 400, but occasionally use HP5 and Delta 100. I process in Ilfotec DDX (although I also occasionally use Ilfosol). Anyone out there with experience with these films? My camera is the Zero Image multiformat (which is at f235).

  Thanks!

  M Billingslea
Received on Sat Jul 20 05:59:03 2002