How to Use the Sunny 16 Rule for Film Photography
You’ve got a roll of film loaded, the light is gorgeous, and then… the panic sets in. What settings do I use? If you’ve ever second-guessed yourself before pressing the shutter, the Sunny 16 rule is about to become your new best friend. This simple formula has been around for decades, and for good reason: it works. With nothing but daylight and a little know-how, you can nail your exposure—no meter required.
Since we are gearing up for a sunny spring break here, I thought it would be fun to share an easy film shooting hack that I use all the time if I don’t want to bring a lot of gear with me. I’m talking about the Sunny 16 rule. I’m sure you’ve heard of it but do you remember what it means? Have you used it?
TL;DR
The Sunny 16 rule is a simple exposure guideline that helps film photographers shoot confidently in bright outdoor light without a meter. This post breaks down how it works, when to use it, and how to adjust for clouds, shade, and real-world shooting scenarios.
What is the Sunny 16 Rule?
The Sunny 16 rule helps you get pretty decent exposures without using a handheld light meter. The rule says that on a bright sunny day, set your f-stop to F16, and your shutter speed to the reciprocal of your film’s speed (ISO). So if you’re shooting Portra 400 film, the speed is 400 and the rule would have you shoot at 1/250 or 1/500. (I always err on the side of over-exposure with film bc film loves light, so I would start at 1/250.) Using these settings will get you in the ballpark of a decent exposure! It’s a guideline, not a law—but it’s a great way to get a baseline exposure in your back pocket. Pretty cool, huh?
SUNNY 16 RULE FOR ISO 400 film = f16 + 1/250
Why Use the Sunny 16 Rule?
So why bother with Sunny 16 when we have meters, apps, and cameras that can do the thinking for us?
- It’s quick and reliable. No digging for a handheld meter or pulling out your phone.
- It builds confidence. You start to recognize light and how it translates into settings.
- It’s timeless. Photographers used this rule long before handheld meters were affordable—and it still works today.
Sunny 16 is about freedom and simplicity, not perfection.
How to Apply Sunny 16 in Real Life
Example with ISO 400 (Portra 400): If you’re shooting Portra 400 in bright sun, your baseline Sunny 16 setting is f/16 @ 1/500 sec.
Adjusting for Other ISOs
ISO 100 = f/16 @ 1/125
ISO 200 = f/16 @ 1/250
ISO 800 = f/16 @ 1/1000
From there, adjust your aperture if the light changes (clouds, shade, overcast).
Common Questions About Sunny 16
I want to mention a few things here about it being a guideline vs a rule. Everything is up to interpretation.
Do I expose for highlights or shadows?
- The Sunny 16 Rule is helping you expose for bright sun, aka, the highlights. If you like your film to look a certain way and always expose for the shadows, for instance, you would need to open up more (or check your in camera meter which again exposes for middle gray, or suck it up and bring a handheld meter with you.)
- I know from shooting in full sun a lot, that for Portra 400, I don’t use f5.6 at 1/2000. I expose for shadows or mid-tones since film loves light and can handle highlights really well. So I would open up from here but experiment and (take notes!!) and see how you like your sunny images exposed!
What if I don’t want to shoot at F16?
- What if you’d rather shoot wide open for that dreamy background blur? You’ll need to adjust your shutter speed to compensate. You have to do the math (or get my Sunny 16 Chart[s] here)! I personally love to shoot at f4 or f5.6 on a bright sunny day, which is at least 3 stops more light (f16 – f11 – f8 – f5.6). So to compensate for all that added light, you would need to then increase your shutter speed by 3 stops (1/250 – 1/500 – 1/1000 – 1/2000).
- I personally love shooting at f/4 or f/5.6 in full sun, but remember—film stocks respond differently. Portra 400, for instance, handles highlights beautifully, so I’ll often open up even more than the math suggests. The key is to experiment, take notes, and learn what look you love.
What if it’s an overcast day?
- Even though it’s called the Sunny 16 rule, you can use it for different conditions. There are many websites out there that have charts, or you can steal the charts I have made and personally use when I shoot.
- The charts all basically say if it’s full sun, start at f16. If there are some clouds open up one stop = f11; overcast open 2 stops = f8, etc. sunny = f16 some clouds = f11 overcast = f8 heavy overcast = f5.6 sunset = f4 bright day in snow (close one stop) = f22.
I hope you’ve found this helpful! If you go try the Sunny 16 rule, please share your images with me and tell me what your favorite exposure settings are!
Final Tips for Better Results
Here’s my best advice when practicing Sunny 16:
- Treat it as a starting point, not a hard-and-fast rule.
- Remember that film loves light—a little overexposure is usually safer than underexposure.
- Bracket exposures or keep notes so you learn faster.
And most importantly? Have fun with it. The Sunny 16 rule isn’t just about getting exposures right—it’s about building confidence in your ability to read light. if you want to go deeper with film (or see what’s possible) sign up for my free live film training below!
Learn about the digital habits that are quietly sabotaging your film – and the simple identity shift that finally makes your results repeatable.
About the author:
Kim Hildebrand is a lifestyle film photographer and educator with 18+ years of experience helping photographers master exposure, simplify shooting on film, and gain confidence without overthinking the technical stuff.
Kim Hildebrand
Photographer & Online Educator since 2007
Other ways I can help you
want some free resources?
1. Free Education & Tips
2. Join my free Family Photography Inside[rs] Community
3. Get The Weekly Edit newsletter
HANDLE FAMILY SESSIONS LIKE A BOSS today
1. Free Session Reviews: Submit your 5 Frame Fixxx
2. Save Time with my 17hats Email Templates for Family Photogs
3. Join The FUNtographer Experience
4. Get the Art of the Walkthrough Training
level up your skills in a big way
1. Film:Â Sign up for the free film training
2. Flash: Sign up for What to do When the Light Sucks Free Live Training for In-Home Photographers
3. Portfolio Reviews & Coaching :Â Book 1:1 Coaching
