Guide

Push & Pull Processing

How to change your film's personality in development. Gain speed in low light, reduce contrast in harsh sun, or transform the look of your favorite stock.

What is push/pull processing?

Push processing means intentionally underexposing your film (rating it at a higher ISO than box speed) and then overdeveloping it to compensate. You gain effective speed but increase contrast and grain.

Pull processing means intentionally overexposing your film (rating it at a lower ISO) and then underdeveloping it. You lose speed but reduce contrast and grain, which can be useful in high-contrast scenes.

The key: you must commit to the entire roll. Every frame on the roll gets the same development. Tell your lab (or adjust your own dev time) before processing.

How stops work

Push +1 stop = rate at double the ISO (e.g., 400 film rated at 800). Push +2 = quadruple (400 rated at 1600). Pull -1 = half the ISO (400 rated at 200).

Reference

Push/Pull Effects

How pushing and pulling changes your film's characteristics.

Process ISO Change Contrast Grain Shadow Detail Highlight Detail
Pull -2 /4 Much lower Finer Better Better
Pull -1 /2 Lower Slightly finer Better Better
Normal - Normal Normal Normal Normal
Push +1 x2 Higher Coarser Less More
Push +2 x4 Much higher Coarser Much less More
Push +3 x8 Highest Coarsest Least Most
Per-Film Guides

Popular Stocks Push/Pull

Detailed push and pull recommendations for the most commonly pushed film stocks.

Kodak Tri-X 400

400 - 3200

The gold standard for push processing. Tri-X has been pushed by photojournalists since the 1950s and handles it beautifully at every stop.

Push +1
ISO 800
Slight contrast boost, barely noticeable grain increase. The "free stop" - many photographers shoot Tri-X here permanently.
Push +2
ISO 1600
Classic pushed look. Punchy contrast, visible grain, deep blacks. The iconic photojournalism aesthetic.
Push +3
ISO 3200
Heavy grain, extreme contrast. Shadow detail drops significantly. Use for dramatic effect in very low light.

Verdict: Tri-X pushed to 1600 is legendary. The grain and contrast at +2 is a look many digital photographers try to emulate.

Ilford HP5 Plus 400

400 - 3200

HP5 pushes almost as well as Tri-X with a slightly different character - softer grain structure and more gradual contrast increase.

Push +1
ISO 800
Gentle contrast increase, grain stays well controlled. Very usable everyday speed boost.
Push +2
ISO 1600
Noticeable grain and contrast, but slightly softer than Tri-X at the same push. Good shadow retention.
Push +3
ISO 3200
Heavy grain with a more organic feel than Tri-X. Usable but shadows go quite dark.

Verdict: HP5 at 1600 is the go-to for Ilford shooters. Some prefer its softer pushed look over Tri-X's harder contrast.

Kodak T-Max 400

400 - 1600

T-grain technology means finer grain when pushed, but the character is different from traditional emulsions. More clinical, less "gritty."

Push +1
ISO 800
Excellent results. Grain stays remarkably fine, contrast increases moderately. The sweet spot for T-Max 400.
Push +2
ISO 1600
Still usable but grain becomes more apparent. Less forgiving in shadow areas than Tri-X or HP5 at the same push.

Verdict: Best pushed just one stop. If you need ISO 1600+, consider T-Max P3200 or Delta 3200 instead.

Kodak Portra 400

400 - 1600

Color film is less forgiving of pushing than B&W. Portra 400 can be pushed but the look changes noticeably.

Push +1
ISO 800
Subtle change. Slightly more contrast and saturation. Grain stays very fine. Many photographers push Portra one stop for punchier results.
Push +2
ISO 1600
Noticeable contrast increase, color shifts become apparent (warmer shadows, cooler highlights). Grain is visible but manageable. Use as a creative choice, not a technical one.

Verdict: Push +1 is fine. Push +2 works but consider Portra 800 or CineStill 800T if you need the speed.

Kodak Portra 800

800 - 1600
Push +1
ISO 1600
Good results with increased warmth and contrast. Grain is noticeable but has a pleasing texture. The best color film option for indoor/low light without flash.

Verdict: One stop is the practical limit. Beyond +1, use CineStill 800T (no reciprocity, tungsten balanced) or switch to B&W.

Ilford Delta 3200

1000 - 6400

Important: Delta 3200 is already a pushed film! The true ISO is approximately 1000. The 3200 rating assumes push processing is the norm.

Rate at 1600
ISO 1600
Many photographers' preferred rating. Better shadow detail, slightly lower contrast. Develop as "push +1" or normal depending on the lab.
Rate at 3200
ISO 3200
"Box speed" - actually ~1.5 stops of push. Heavy grain with atmospheric quality. The intended look.
Rate at 6400
ISO 6400
Extreme grain and contrast. Only for emergency low-light situations. Develop as push +1 from 3200.

Verdict: Rating at 1600 gives the best balance. 3200 for the atmospheric look. 6400 only when you have no other choice.

CineStill 800T

800 - 3200

CineStill 800T has no reciprocity failure, making it exceptional for long exposures at any push level.

Push +1
ISO 1600
More contrast enhances the cinematic look. Halation around light sources becomes more pronounced. Great for neon-lit scenes.
Push +2
ISO 3200
Heavy contrast, visible grain, dramatic halation. Shadow detail drops but the cinematic effect is amplified.

Verdict: Pushing CineStill amplifies its cinematic character. +1 is a popular choice for night street photography.

What to tell your lab

When you drop off film for processing, you need to clearly communicate any push or pull instructions. Here's exactly what to say:

For push processing: "Please push this roll [number] stops." For example: Push +2 stops or Push to 1600 (for ISO 400 film).

For pull processing: "Please pull this roll [number] stops." For example: Pull -1 stop or Pull to 200 (for ISO 400 film).

Write it on the canister. Use a marker or tape to write the push/pull instructions directly on the film canister. Labs process many rolls and written instructions prevent mistakes.

Additional tips:

- Most labs charge extra for push/pull processing (usually $2-5 per roll)
- Not all labs offer push/pull - confirm before shooting
- C-41 (color) push/pull is less common than B&W - ask first
- E-6 (slide) pushing is possible but risky - color shifts are common
- If you develop at home, adjust your development time according to your developer's data sheet