Kodak 4-X Reversal
Posted 01 October 2005 - 05:30 PM
Posted 02 October 2005 - 05:15 PM
If I recall correctly, the old Tri-X stock had the same speed rating in either process. The old Plus-X, however, got one stop faster when it was processed in the new developer. So you've got to take a guess as to whether you think the formulation of 4-X is closer to Tri-X or Plus-X and go with that. Tri-X is faster, so maybe the 4-X will respond in the same way and maintain its normal speed rating.
But the age of the stock is probably the biggest variable here, and I don't know what to say about that. B&W will hold up longer than color, but it's still got to be pretty old by now. Does it have a date on it? Good luck with shooting, let us know how it goes.
Posted 05 October 2005 - 11:26 PM
Posted 05 October 2005 - 11:51 PM
It's sound stripe stock and in old style packaging, so is probably about 20 yrs old.... Waddya think?
I kept some DXN for ten years in the frezer, and it has a bit of fog. has the film been frozen? I have found over the years that the higher the speed, the more likely that storage will degrade film.
When I did Microfilming, we would have so many variables that the norm was to do a step test. Shoot a test with target having white grey and black patches. The film was read with a densitometer, and the exposure was chosen to get the best results. I suspect that with the variables you are dealing with (1) changed process, and (2) degradation of the film that using such a method would be a wise thing. You can probaly spool off a sample on a 100ft spool, and do a short burst at each speed. With a note in the frame so you can identify them later.
MY cynical side sugests starting at ASA10, and working up...
(Growing up I was always looking for bargins in outdated and or surplus film)
Posted 06 October 2005 - 01:44 AM
Posted 06 October 2005 - 01:29 PM
I agree, film that old is likely to have some issues, and the effect of the new process on such an old film was not tested.
If you must use such old film, run some tests, including an exposure series.