Introduction

Tell the students that usually the ISO speed for a film is the best indication of that film's sensitivity to light. Exposing it at that speed produces the best results. The effective film speed number, however, can be changed if factors in development are changed.

Instruction

Have the students load their rolls of film into developing tanks and proceed with processing as usual, except for appropriate development changes. Tell them to expect a slight loss of quality and an increase in graininess with enlargement. Explain that push processing film can be an effective way to get natural-appearing pictures under low light levels without using flash.

Assignment

Have the students pick out any prints that have white or black spots on them and bring them to the next class.