Originally posted by johnha Hi Jonathan,
I can't remember the pattern for the DX coding, but if a camera was missing a contact (or it wasn't wired up), it would probably default to the highest ISO available with the contacts it had (could be either 800 or 1600 I think?). Only if there was no DX coding would it default to 100.
Also, Delta 3200 has a base ISO value of 800 from memory, to get 3200 you have to extend development (at which point it is EI - Exposure Index rather than ISO). If the camera recognises ISO 1600 you could shoot it at that and compensate by extending development less than 3200. When getting it processed commercially, you should indicate the EI value so the lab know how to develop it.
You're right. This is from Ilford's data sheet:
DELTA 3200 Professional has an ISO speed rating of ISO 1000/31º (1000ASA, 31DIN) to daylight. The ISO speed rating was measured using ILFORD ID-11 developer at 20°C/68ºF with intermittent agitation in a spiral tank.
But so is this:
The recommended meter setting for DELTA 3200 Professional is EI 3200/36, but good image quality can also be obtained at meter settings from EI 400/27 to EI 6400/39. It can be used in all types of lighting.
But according to the diagram here
DX encoding - Wikipedia, the free encyclopedia the dx coding on the film cassette is "custom 2". What does that mean? Would I need a camera that has pre-programmed custom values, presumably designed to allow pushing and pulling? Why then do the P30s appear to correctly register the film as 3200?