| beejaybee |
| (Marvin) |
| 07/12/2007 13:34 |
|
Re: Slow B&W Film
|
Quote:
Delta 25 got scratched. Too close to PanF
So Delta 100 isn't close to FP4? Delta 400 and HP5+ aren't competing for the same market?
Quote:
without the drawback (to me) of extended red sensitivity.
That was Tech Pan's unique property (sensitivity to hydrogen alpha emission, 656.3 nm). Tech Pan also benefitted from hypersensitization more than any other film, and suffered much less from reciprocity failure - especially when hypersensitized by gas immersion, it was the fastest film by far for exposures over 10 minutes or so.
Sadly missed.