So by chance, when testing my new sensitometer, I discovered that the datasheet dev. times of Ilford Fp4+ in Hc110 result in crazy contrasty negatives. This is most likely because Ilford doesn't really care about contrast and only wants to hit the Box speed. Well if anyone wants to develop FP4 in HC110 with decent results, here are my findings: Goolge Drive Link
The time Ilford recommends is 9 min, ISO 125 in 1+31, this creates a curve with a steepness of about 1.3, which is too steep for me
. Following my tests, a good development and sensitivity are about 5 min in 1+47 and approx. ISO 50. This will compress a ~1.5 SBR (Subject luminance range) to ~1.1 DR. (Density range). The Data in my PDF will provide SBR to DR tables for each curve.
I hope this might help some who are struggling with too contrasty FP4 in HC110.
The time Ilford recommends is 9 min, ISO 125 in 1+31, this creates a curve with a steepness of about 1.3, which is too steep for me
. Following my tests, a good development and sensitivity are about 5 min in 1+47 and approx. ISO 50. This will compress a ~1.5 SBR (Subject luminance range) to ~1.1 DR. (Density range). The Data in my PDF will provide SBR to DR tables for each curve.I hope this might help some who are struggling with too contrasty FP4 in HC110.
