film latitude – IJM Photography

Hello lovely people.

I’m a bloody fool. I made the stupidest of mistakes when shooting HP5 Plus 400 speed film at ISO 100.

I’d been intending to use 100 ASA film in my Nikon FE, so in preparation, I had set my camera’s ISO dial to 100. I loaded the HP5 and forgot to change this blasted setting. By the time I realised, I had already taken “some” photos. I didn’t want to wind the film on to change the setting because the sun was shining and I didn’t want to waste the light.

In for a penny, in for a pound. I thought, “What the heck?” They say you have all this “latitude” with film, so I went online to find out if I could salvage the roll. Here we go for a walk in the Parc Garenne Lemot in Clisson.

I developed the film in Ilfosil 3 (1:9) and used the development times for Kentmere 100, praying that I would have something usable…

Parameter	Details
Film	Ilford HP5 Plus 400
Exposure	Rated at ISO 100 (2 stops overexposed)
Developer	Ilfosol 3 at 1:9
Development Time	5 minutes 30 seconds (using Kentmere 100 time)
Result	Lower contrast, smooth tonal transitions, fine-looking grain, excellent shadow detail
Camera	Nikon FE
Location	Parc de la Garenne Lemot, Clisson

**THE STATUE – Front view of classical statue on pedestal** – *This shot demonstrates the beautiful tonal range achieved through pull processing*

The Theory: Pulling Two Stops

For those who aren’t deep in the film weeds, here is what I actually did. By setting my camera to 100 ISO while using 400 speed film, I was overexposing by two stops.

Now, common wisdom says that pulling HP5 to 200 ASA (one stop) is perfectly fine. But I thought I was pushing my luck pulling it two stops to 100 ASA. I thought I was taking the mickey with the film gods.

By giving it extra light and less development (pull processing), I was essentially asking the film to reduce contrast and grain significantly. I was testing just how much abuse it could take before the negatives turned into flat, grey mush.

I didn’t develop it for standard HP5 400 times. I treated the whole roll as if it were 100 ISO film from start to finish.

The Results

When I scanned the negatives, I was genuinely surprised. The negatives were dense, but not unmanageable. The scanner handled them well. Here is what the process actually looked like in practice.

1. Rich Shadow Detail

The first thing you notice is the lack of “muddy” shadows. Usually, HP5 can get a bit grainy in the dark areas. Here, the shadows under the pergola and the fence are deep, but they still hold detail.

**FENCE WITH LONG SHADOWS – Diagonal shadows cast across gravel path** – *Notice how the deep shadows still retain texture and detail in the gravel*

2. Texture and Grain

This is the real winner for me. Look at the texture on the wood in these shots. Because I gave the film extra light and reduced the development, the grain structure is much finer than usual. It looks almost like a slower film (like Delta 100) in the mid-tones.

**WEATHERED WOODEN POST – Close-up showing wood grain and texture** – *The fine grain structure is clearly visible in the wood texture*

3. Highlight Control

I was worried the bright spring sun would blow out the sky. Looking at these branches against the sky, you can see a beautiful grey gradient rather than a blown-out white. The reduced development time really helped keep those highlights in check, even with the two-stop overexposure.

**BARE TREE BRANCHES AGAINST SKY – Intricate branch pattern with grey sky** – *This is the proof – the sky retains beautiful tonal gradation despite overexposure*

4. Tonal Range

From the white marble of the statues to the dark foliage, the tonal separation is superb. The process gave me a creamy, classical look that I might not have achieved at box speed.

**ORNATE URN WITH STATUE IN BACKGROUND – Layered composition** – *Foreground and background detail with smooth tonal transitions*

**CLASSICAL COLONNADE – Stone pillars with cloudy sky** – *Weathered stone texture and cloud detail demonstrate the technique’s versatility*

The Verdict

So, was this a disaster? Absolutely not.

In fact, I was pleasantly surprised. Because I gave the film so much light and reduced the development, the shadow detail is incredibly rich and the highlights are held back. There is virtually no grain in the dark areas. The contrast is lower than standard HP5, which gives it a very smooth, almost medium-format look.

**Ornate scrollwork detail** – *Razor-sharp detail and micro-contrast prove no sharpness was lost*

It turns out, what I thought was a stupid mistake is actually a technique some photographers use on purpose! Pull processing HP5 (rating it at 100 or 200 ISO and developing accordingly) is known to produce finer grain and lower contrast. I thought I was pushing my luck going two stops, but the film handled it like a champion.

Would I Do It Again?

Would I deliberately shoot HP5 400 at 100 ASA again? No, probably not. If I want 100 ASA film, I’ll just use 100 ASA film. It’s cheaper and more straightforward.

But it’s damned good to know that at a push (sorry, pull), it could work. If you’re ever in a situation where you’ve loaded the wrong film, or you’re caught out by changing light conditions, HP5 Plus can take the abuse.

Have you ever accidentally shot film at the wrong ISO? Did you save the roll or bin it? Let me know in the comments below.

Happy shooting

Ian from IJM Photography

Post Scriptum:

Shooting Nantes at Night with HP5+

One September evening I walked between Place Bouffay and rue des Petits Écuries with the Nikon FE and a roll of HP5+. Box speed—400 ASA. No pushing. No stand development. Just me, tired eyes, and the hope the city would be kind.

It wasn’t always.

Some frames failed outright. Missed focus—my eyes couldn’t lock the split-image patch in the dim light. Others blurred from camera shake at 1/15th, handholding like a fool. I won’t pretend those shots have hidden merit. They’re gone. But the ones that landed? They held more than I expected.

Because Nantes at night isn’t dark. Restaurants pour light onto wet cobbles. Shop signs, streetlamps, even those little menu stands outside cafés—they all feed the scene. I’d guess the focus, press the shutter, and move on. Later, scanning the roll, I found detail in shadows I thought were lost. Not because I’d exposed well—I hadn’t—but because HP5+ gathered what was there even when I fumbled.

That’s latitude in practice. Not a spec sheet promise, but the difference between a usable negative and a blank one when your hands shake and your eyes fail. I didn’t push to 1600. I didn’t need to. I just needed a film that wouldn’t punish me for being human.

The December shots are more traditional street work—grey skies, low sun, the light you expect. Even the coffee cup photo owes something to Instagram. I won’t deny it. We absorb what we see online; it seeps into our framing without us noticing. No shame in that—it’s just how we learn now.

But the September shots that worked feel more like my own. Standing in Place Bouffay as evening deepened, watching light pool around tables and bounce off stone—I wasn’t chasing a look. I was just there, squinting, hoping. And HP5+ met that without fuss.

I’m not claiming mastery. I’m claiming a few good frames out of a roll that also held misses. That feels honest. Cities don’t go dark—they transform. And sometimes, even with bad eyesight and shaky hands, a simple roll of film gives you just enough to keep walking.

All photographs shot on Ilford HP5+ at 400 ASA, developed in standard chemistry. Nikon FE, Nantes—December 2025 and September 2025, Place Bouffay and rue des Petits Écuries.