Ilford HP5+ 400 4x5: Expose and Develop 25 Sheets
By WALKENS House of Film | Published: 2026-11-04
Category: How-to Guides
A practical workflow for exposing and developing Ilford HP5+ 400 4x5 sheet film, from meter reading to the wash, with checkpoints for common large format mistakes.
Quick answer
Treat Ilford HP5+ 400 4x5 as a 400 ISO film with wide exposure latitude: meter for the shadows, expose at box speed unless your lighting is contrasty, and develop in a standard black-and-white developer using Ilford's published time for your developer and temperature. The biggest risks are loading errors and uneven development, so slow down at those two stages.
Why HP5+ 4x5 rewards a steady workflow
HP5+ is a medium-contrast, high-speed film that Ilford describes as its most popular. In 4x5, that speed and latitude mean you can handhold in bright light or work in mixed lighting without pushing, but each sheet costs real money and time. A repeatable process matters more than chasing a perfect exposure on every frame.
Sheet film also removes some safety nets: you cannot bracket as freely as with roll film, and a single loading mistake can ruin a shot. The steps below keep your handling consistent so the film's latitude does the work.
Metering choices that affect your negatives
HP5+ has wide exposure latitude, so small metering errors are usually recoverable. Still, decide before you shoot whether you are exposing for shadows or averaging the scene. For most general work, take an incident reading or a spot reading of a mid-tone and expose at 400 ISO.
In high-contrast light, err toward more exposure rather than less; negative film tolerates overexposure better than underexposure. If you plan to push the film, commit to that decision for the whole batch so your development times stay consistent.
Development variables to control
Ilford publishes development times for HP5+ across its developers, but those times assume a specific temperature and agitation pattern. Choose one developer, one temperature, and one agitation routine, then keep them fixed. Changing all three at once makes it impossible to diagnose a thin or dense negative.
Sheet film development is prone to uneven results if sheets stick together or agitation is inconsistent. Use a tank or tray method you can repeat, and count your agitation cycles rather than guessing.
Step-by-step: exposing and developing 25 sheets
- Load holders in dim light: Work in a darkroom or changing bag with clean, dry hands. Slide each sheet into the holder with the notches in the same corner every time, then close the dark slide fully. Common mistake: loading two sheets into one side or leaving the dark slide partly out. Check that every holder feels flat and the dark slide sits flush before you put it in your bag.
- Meter and expose at 400 ISO: Take a shadow or incident reading, set your meter to ISO 400, and expose according to your chosen aperture and shutter speed. In contrasty light, add a third to a half stop of exposure. Common mistake: forgetting to close the shutter before pulling the dark slide. Make a habit of checking the shutter is closed and the aperture is set before every sheet.
- Record each sheet: Note the holder number, exposure, and any push or pull intention on a small log or tape on the holder. This matters because you may develop sheets from different sessions together. Common mistake: mixing normal and pushed sheets in the same development run. If you cannot identify a sheet's exposure, develop it as normal rather than guessing a push.
- Develop with one fixed routine: Choose a developer and look up Ilford's published time for HP5+ at your working temperature. Pre-soak if your routine calls for it, then develop with consistent agitation, stop, fix, and wash according to the developer and fixer instructions. Common mistake: changing agitation halfway through the run. Write your time, temperature, and agitation pattern on the tank so you can repeat it next time.
- Dry and inspect before printing or scanning: Hang sheets to dry in a dust-free space, then check each negative on a light table for density and evenness. Look for surge marks or edge density that suggests uneven agitation. Common mistake: handling wet negatives with bare fingers. If several sheets show the same unevenness, adjust your agitation before changing exposure.
Film facts for this workflow
- Ilford HP5+ 400 4X5 - 25 Sheets: Ilford HP5+ 400 4x5 is a panchromatic black-and-white negative film rated ISO 400/27° in standard processing, supplied as 25 sheets per pack. The 25-sheet pack gives you enough sheets to practice a consistent exposure and development routine without opening multiple boxes.
Ilford HP5+ 400 4X5 - 25 Sheets
