Developing time for 120 100 ASA Pan Film?

[3 Olives]

My son just started developing yesterday with some 35mm film. He had mixed results but he learned a lot and had fun.
He has an unbranded roll of 120 100 ASA Pan Film to develop in D-76. Please tell me if 7 min. sounds correct. Thanks!

 

[Paul Sorensen]

There are going to be pretty different times for different films, so it is really tough to tell without your knowing what brand of film it is. You could certainly start at about 7 min, you will likely get something ranging from very good to marginally printable. For use as a one shot developer, D-76 is normally diluted 1:1, are you doing this or using as stock? If you are diluting the developer, I suspect you may be underdeveloping a touch at 7 min, but again it really depends on the film. Where did you get the film? That might help us identify it.

 

[3 Olives]

There are going to be pretty different times for different films, so it is really tough to tell without your knowing what brand of film it is. You could certainly start at about 7 min, you will likely get something ranging from very good to marginally printable. For use as a one shot developer, D-76 is normally diluted 1:1, are you doing this or using as stock? If you are diluting the developer, I suspect you may be underdeveloping a touch at 7 min, but again it really depends on the film. Where did you get the film? That might help us identify it.

Thanks for the reply. We have the Kodak D-76 B&W Film Developer package that makes 1 Liter. The film was given to us by a very generous APUG member. I sent him a PM, but have not heard back from him.

 

[Ian Grant]

There are going to be pretty different times for different films, so it is really tough to tell without your knowing what brand of film it is. You could certainly start at about 7 min, you will likely get something ranging from very good to marginally printable. For use as a one shot developer, D-76 is normally diluted 1:1, are you doing this or using as stock? If you are diluting the developer, I suspect you may be underdeveloping a touch at 7 min, but again it really depends on the film. Where did you get the film? That might help us identify it.

D76/ID11 is normally used Full Strength, and often replenished. In a commercial lab all films would get processed for the same development time and apart from Fomapan the optimal development times needed for 100 ISO B&W films are very close anyway.

As Paul says 7 minutes is perhaps a bit short, 8 minutes would be better.

Ian