By the DarkroomEnlarger.co.uk — The UK Home Darkroom Authority Team · Updated May 2026 · Independent, reader-supported

Best Darkroom Enlarger Timers & Exposure Meters UK — Reviewed

Anyone who's stood in a darkroom watching a print in the tray knows that printing is all about consistency. A few seconds either way and your blacks muddy or your highlights lose detail. That's where a reliable enlarger timer becomes essential—not optional. You can't print dodging and burning accurately, or repeat prints reliably, without knowing precisely how long your negatives have been exposed to light.

This guide covers the timers and meters that actually work for UK darkroom users, with honest detail on what separates a weekend hobbyist setup from something that'll still be reliable in five years.

Why f-stop timing matters more than you think

Before diving into specific timers, it's worth understanding what you're actually controlling. Most enlarger timers simply count seconds—0 to 120, usually—but that's a blunt instrument. What matters is exposure at the paper, which depends on:

• How far your enlarger head is from the paper (hence the f-stop setting)
• Your light source brightness
• Your negative density

A timer that accounts for f-stop changes lets you calculate exposure changes mathematically. Stop down from f8 to f11? That's roughly one f-stop reduction in light, so you need twice the exposure time. A dedicated f-stop timer does this multiplication for you. You dial in one "correct" exposure time at f8, then the timer automatically doubles it when you switch to f11. No guesswork.

Most timers on the UK market don't do this. They're interval timers, full stop. Which is fine if you're methodical about exposure calculation. But if you're batch-printing, or chasing tonal variation across a series, the math becomes tedious. That's where purpose-built systems earn their cost.

Paterson Enlarger Timers—the accessible workhorse

Paterson has sold enlarger timers in the UK for decades, and their current range sits at the practical end of the market. The Paterson Exposure Timer (models PF70 and PF80) are interval timers: you set the seconds, press the button, and they cut your enlarger light after the chosen duration. No f-stop compensation, no exposure memory.

What they do well: Simple to use, genuinely robust, and cheap enough that replacing one doesn't demand a second mortgage. The footswitch is tactile and reliable. They'll tolerate the temperature swings of a working darkroom. Most UK enlarger users have owned at least one.

Honest drawbacks: They offer no way to store exposure sequences or adjust for f-stop changes. If you're printing the same negative at multiple f-stops, you're mentally multiplying 20 seconds by 1.4, then by another 1.4, and hoping you didn't lose count. They're also purely mechanical—no display, no fancy features—which means no calibration possibility if you suspect timing drift.

Best for: Beginners and reproducible-work enthusiasts who print the same enlargement repeatedly and don't mind calculating manually.

RH Designs—precision engineering for the serious printer

RH Designs, run by darkroom engineer Roger Hicks, builds timers from first principles. The RH Designs Exposure Timer stands apart because it does incorporate f-stop compensation. You set your baseline exposure at one f-stop, and the timer calculates required times for any other aperture.

They offer several models (TimerTL, TimerST, and others); the core difference is whether you want digital display or analogue readout, and whether you need memory for multiple exposure sequences.

What makes them different: Genuine optical physics built in. The f-stop calculation is accurate because it's based on the actual optical relationship between aperture and exposure—not approximated. The build quality is exceptional. These are tools designed by someone who still prints in a darkroom, not products engineered for cost.

Honest drawbacks: They cost significantly more than Paterson—typically £200 to £400 depending on model. They require mains power and a footswitch setup, so less portable. Some models have learning curves; the interfaces aren't as intuitive as a basic dial timer. And if you're only printing contact sheets or the same enlargement repeatedly, you're paying for capability you won't use.

Best for: Serious printers doing editorial work, portrait series, or anything requiring controlled tonal variation across prints. Anyone printing 11x14 or larger, where exposure precision directly affects quality.

Heiland Multichron—German engineering, UK availability

Heiland timers appear less frequently in UK darkrooms than Paterson or RH Designs, partly because they're German-engineered and pricing reflects that. But they're worth knowing about because they occupy interesting middle ground: better than Paterson for serious work, simpler than top-tier RH Designs systems.

The Heiland Multichron offers digital interval timing and memory for multiple sequences. The interface is straightforward: set your exposure, press start, it cuts the light. You can program up to four different exposures and recall them instantly. This matters if you're printing a series where image one needs 25 seconds and image two needs 32 seconds—you don't recalculate, you just press button two.

Honest assessment: Very reliable, German precision, but no f-stop compensation on most models. Pricing sits around £150–£250, which makes it genuinely competitive for printers who need repeatability but not full calculation support. Parts availability in the UK can be patchy if something fails years down the line.

Exposure meters—do you need one?

A light meter (or exposure meter) measures the actual light falling on your paper at any given f-stop and distance. Models like the Sekonic L-308X or Gossen Luna-Pro SBC can be pointed at your enlarger baseboard to read exact exposure in lux, then referenced against test strips.

The practical truth: They're useful if you're moving between different enlargers, or working in variable studio light. They remove doubt about whether a new setup needs 30 or 50 seconds. But they're a refinement, not essential—a disciplined approach with test strips and notes achieves the same result, slower.

For UK darkroom users, a meter is optional unless you're teaching others or running a small printing business.

What to consider when choosing

Budget first: Paterson covers printing up to 16x20 prints comfortably if you're patient with exposure calculation. RH Designs justifies itself if you're printing more than 50 prints monthly or need tonal consistency.

Workflow: Do you print the same image repeatedly (interval timer), or a series of different exposures (memory function)?

Darkroom type: Home hobby setup? Paterson. Shared studio space where you can't rely on consistent conditions? RH Designs or Heiland.

Scalability: If you might upgrade your enlarger or add colour printing later, choose a timer that'll adapt. RH Designs does; basic Patersons don't.

The best timer is the one you'll actually use consistently and trust. That usually means the simplest option that fits your workflow—not the most featured, not the cheapest, but the honest middle.