Darkroom Tip: Pushing Film Is Mostly Pushing Contrast

When you shoot HP5 at 1600 and extend development, you're not really gaining two stops of speed. Development can't create shadow detail that never hit the film — it mostly builds density in the mid-tones and highlights, which reads as a brighter, contrastier image.

Practical upshot: when pushing, expose for the shadows you care about (meter them and place them deliberately) and let the highlights ride. Scenes with soft, flat light push beautifully; harsh contrasty scenes get brutal.

Analogly's Roll Log tracks push/pull per roll, so at dev time you know exactly what each tank needs.