Shooting ISO tells the meter how much light to give the film. Development adjustment tells the lab whether to alter processing.
Changing the camera from 400 to 800 without telling the lab simply underexposes the film by one stop.
What changes
A coordinated push combines reduced exposure with increased development. A coordinated pull combines extra exposure with reduced development.
When it helps
Clear separation prevents vague or contradictory lab notes.
Important limits
- Cameras do not communicate ISO history to the lab
- DX coding may set ISO automatically
- Mixed ISO settings on one roll cannot receive separate development
- Development does not change the film’s original sensitivity
- Write down exposure choices
Frequently asked questions
Can this rescue every photograph?
No. It can only work with information recorded by the film or retained in the developed negative.
Should I tell the laboratory in advance?
Always, when you intentionally deviate from box speed.
Where can I learn more?
See wrong ISO on film.
0 comments