Underwater Photography Settings: A Working Photographer’s Setup Guide

Underwater camera settings guide

By William Drumm, underwater photographer and ocean ambassador

Settings questions are the most common questions I get from people learning underwater photography. What aperture? What shutter speed? What ISO? What white balance setting?
The honest answer is that there is no single right answer. Settings underwater are situational – they depend on depth, subject, light, water clarity, and the specific look you want. But after years of shooting in dozens of countries, I have built a set of starting points that work in most situations and a framework for adjusting from there.
This is a reference piece. Bookmark it. Come back to it before dives.
I am writing this with the assumption that you have read the field guide and are looking for the next level of detail on settings specifically. If you have not read the field guide yet, start there for the broader context.

What this guide covers:

• White balance – the foundation of every underwater photograph
• Shutter speed – and the underwater-specific concept of using it to control ambient exposure
• Aperture – what changes underwater and what does not
• ISO – why you should push higher than you think
• Focus mode – and why autofocus is harder underwater than on land
• Settings for specific subjects – macro, wide-angle reef, portraits, fast pelagics, low-light scenes
• Settings for specific conditions – tropical, temperate, low visibility, blue water, cold water
• My typical starting points by scenario

Shutter Speed Underwater

Shutter speed underwater does two jobs. The first is the obvious one – freezing motion. The second is one of the most powerful underwater-specific concepts there is, and most beginners never learn it.

The basics: freezing motion

Underwater you are always in motion, even when you think you are still. The water is moving you. Currents, surge, your breathing pattern – all of it shifts the camera. So even for static subjects, your minimum hand-held shutter speed is faster underwater than on land.

Practical floor:

• Static subjects (corals, anemones, sleeping turtles): 1/60 minimum, 1/125 safer
• Slow-moving subjects (stingrays cruising, big sharks at distance): 1/125 minimum, 1/250 better
• Fast subjects (reef sharks circling, fish darting, dolphins): 1/250 minimum, 1/500 or faster
• Very fast subjects (bait balls, hunting predators, breaching): 1/1000 or faster

The concept beginners miss: shutter speed controls ambient exposure

Here is the thing that changes how you think about shutter speed underwater: when you use strobes, shutter speed and strobe power do separate jobs.

• Strobe power controls the foreground subject exposure (the thing you are lighting)
• Shutter speed controls the ambient exposure (the blue or green water behind your subject)

This means you can change the look of the background while keeping the subject perfectly exposed, just by changing shutter speed.

• Want a brighter, lighter blue background? Slower shutter speed (more ambient light comes in). 1/60, 1/125.
• Want a darker, more dramatic background? Faster shutter speed. 1/250, 1/500.
• Want pure black water column behind the subject? 1/1000 or faster. The strobe lights the foreground; the ambient is too brief to register.

This single concept transforms your work once you understand it. The dramatic, separated, almost cinematic look in great underwater photographs is usually a result of fast shutter (dark ambient) plus strobe (lit foreground). The bright, open, “snorkel-day” look is slower shutter (lighter ambient) plus strobe.

Your shutter speed is your background brightness dial. Use it that way

Sync speed limits

Most cameras have a flash sync speed – usually 1/160 to 1/250 – above which the strobe will not fully illuminate the frame. If you are using strobes and want to go faster than your sync speed for a darker ambient effect, you need either:

• A camera with high-speed sync (HSS) capability and a strobe that supports it
• Or a camera with electronic shutter (most modern mirrorless cameras have this)

On the Canon R5 and R5 Mark II, electronic shutter mode lets me sync strobes at any speed up to 1/8000. This is one of the genuine advantages of modern mirrorless for underwater work – the old DSLR sync-speed ceiling does not apply.

Aperture Underwater

Aperture behaves a little differently underwater because the dome port adds a virtual image plane in front of your camera. The optical effects matter, but the practical guidance is straightforward.

The dome port effect

When you put a wide-angle lens behind a dome port, the dome creates a virtual image of your subject closer to the camera than the actual subject. This is what makes dome ports work optically – they correct for the magnification effect of being underwater.

Practical consequence: dome ports introduce some softness in the corners of the frame, especially at wider apertures. Stopping down to f/8 or f/11 cleans up corner sharpness significantly. This is why most underwater wide-angle work happens at smaller apertures than you would expect from land photography.

Practical aperture guidance by lens type

Wide angle (15-35mm range): f/8 to f/11 for sharpness across the frame. f/5.6 in the center will be sharp, but the corners go soft. f/13-16 is fine for additional depth of field but starts to introduce diffraction softness.

Standard zoom (28-70mm range): f/5.6 to f/8 for portraits and mid-range work. f/8 to f/11 if you want greater depth of field. The Canon RF 28-70 f/2.0 I shoot is sharp across the frame from f/2.8 to f/11; f/5.6 is my workhorse aperture for this lens underwater.

Macro (90-105mm range): f/11 to f/22. Macro work magnifies the subject, which dramatically reduces apparent depth of field. At 1:1 magnification, your depth of field at f/11 is measured in millimeters. f/16 to f/22 is normal for sharp 1:1 work despite the diffraction penalty.

Fisheye (8-15mm range): f/8 to f/13. Fisheyes have inherent edge-to-edge sharpness advantages over rectilinear wides at small apertures, but they still benefit from stopping down for full depth.

Why depth of field is different underwater

Two things change DOF behavior underwater:

• You are usually closer to your subject than on land. Closer focus distance = shallower DOF.
• The dome port virtual image effect changes apparent focus distance, which affects DOF calculations.

Practical implication: when in doubt, stop down further than you would on land. f/11 underwater is roughly equivalent to f/8 on land in terms of how the resulting image reads.

In reality, it’s often dark underwater. I often have to shoot at f/2.8, especially in caves and in deeper water. Aiming to stay above f/5.6 for most scenes is a good starting point. If you have plenty of light, try shooting ~f/8-f/11 most of the time. 

For underwater portraits, I will sometimes shoot at f/2.0 to capture the maximum amount of bokeh from the background. This is especially useful in pools where having a blurry background helps draw the focus to the subject. Just make sure the eyes are mouth are in focus.  

ISO Underwater

Push higher than you think you should. This is the most common piece of underwater settings advice I give and the one that surprises beginners most.

The case for higher ISO

Underwater, you are almost always making a tradeoff between three things:

• Adequate shutter speed (to freeze motion)
• Adequate aperture (for depth of field and dome port sharpness)
• Adequate exposure (because light is dim at depth)

You can solve any two but not all three without raising ISO. So you raise ISO. Modern full-frame sensors (Canon R5, Sony A7 IV, Nikon Z series) handle ISO 1600-3200 cleanly. ISO 6400 is usable with modern noise reduction. Even ISO 12800 in low-light cave or wreck work is salvageable.

A noisy sharp photograph can be cleaned up in post. A blurry low-noise photograph cannot be saved. Choose noise over blur every time.

My typical ISO starting points

• Bright tropical surface, sunny day: ISO 200-400
• Mid-depth tropical (10-20m), good light: ISO 400-800
• Mid-depth temperate or overcast: ISO 800-1600
• Deep tropical (25-40m), good visibility: ISO 800-1600
• Cave, wreck interior, late afternoon: ISO 1600-6400
• Night dive with strobes: ISO 200-800 (the strobes do the work)
• Macro with strobes: ISO 200-400 (close range, full strobe coverage)

Modern noise reduction has changed the math

Tools like Lightroom’s built-in noise reduction, Topaz DeNoise AI, and DxO PureRAW have dramatically improved over the past few years. Files I would have considered unusable from ISO 6400 five years ago are now publishable after a quick noise reduction pass.

What this means: do not be afraid of high ISO. Get the shot. Clean it up later.

Focus Mode Underwater

Autofocus underwater is harder than autofocus on land for three reasons: less light reaches the sensor, contrast is lower because of haze in the water, and the AF system gets distracted by floating particles between you and your subject.

What works:

Continuous AF (AI Servo / AF-C) for moving subjects

Sharks, fish, dolphins, anything that travels through the frame – continuous AF is your friend. The camera tracks the subject as it moves and adjusts focus continuously. On modern mirrorless bodies, animal-eye detection AF works on fish about 70% of the time and on marine mammals about 50% of the time. When it locks, it locks well.

Single-point AF (One Shot / AF-S) for portraits and macro

When you have a moment and want precision, switch to single-point AF and place the point exactly where you want focus. Eye for a subject portrait. The body of a nudibranch for macro. Lock focus, hold, recompose if needed.

Some cameras have small AF point selection that lets you pick a single tiny zone for very precise placement. Use it for macro work especially.

Manual focus for difficult conditions

When the AF cannot find anything to grab onto – extreme low light, low visibility, very small subjects, ultra-shallow depth of field – manual focus is the answer. Pre-focus to the expected subject distance. Use a focus light if your camera has one. Magnify the live view if your camera supports it.

Macro work in particular often benefits from manual focus or a hybrid approach (AF for initial lock, manual fine-tune).

Continuous burst vs single shot

Burst mode (continuous shooting) is your friend for moving subjects. The buffer on modern mirrorless will give you 20-30 frames in a single burst, and the keeper rate goes up dramatically when you have multiple frames to choose from. Behavior changes by the millisecond underwater – the difference between a usable shot and the perfect frame is often two frames apart.

On the R5 Mark II, I shoot at 12fps mechanical / 20fps electronic for moving subjects. The hit rate on shark approaches went up significantly when I switched to higher burst rates.

Settings for Specific Subjects

Different subjects require different settings priorities. Here is what I dial in for each major subject category.

Wide-angle reef and pelagic

• Aperture: f/8 to f/11
• Shutter: 1/125 to 1/250 (faster if you want darker ambient)
• ISO: 200-800 depending on depth and light
• Focus: continuous AF, wide focus area
• White balance: auto if shooting RAW, custom if JPEG or video
• Strobes/video lights: optional. Off for sun-ray silhouettes, on for color in the foreground

Macro

• Aperture: f/11 to f/22 when possible (depth of field is critical at high magnification)
• Shutter: 1/200 to 1/250 (sync speed friendly, freezes minor camera shake)
• ISO: 200-400 (strobes do the work; keep noise low for fine detail)
• Focus: single-point AF or manual focus, magnified live view if available
• White balance: auto with strobes
• Strobes/video lights: Yes when possible. One or two strobes positioned to avoid backscatter, often with snoots for tight beam control

Subject portraits (sharks, turtles, large fish)

• Aperture: f/5.6 to f/8
• Shutter: 1/250 to 1/500
• ISO: 400-1600 depending on depth
• Focus: single-point AF on the eye, eye-detection AF if available
• White balance: auto with strobes, RAW for ambient
• Strobes/video lights: optional. Yes for color rendering, strobes pulled back from camera body. Depends on conditions.

Fast pelagics (sharks circling, dolphins, fish hunting)

• Aperture: f/5.6 to f/8
• Shutter: 1/500 to 1/1000
• ISO: 800-3200 (high to support fast shutter)
• Focus: continuous AF, animal eye detection if available, burst mode on
• White balance: auto if RAW
• Strobes: optional. Often natural light works better for these subjects because the action moves outside strobe range

Cave, wreck, low-light environments

• Aperture: f/5.6 to f/8 (open to gather light)
• Shutter: 1/60 to 1/125 (slower if subject is static, faster if there is movement)
• ISO: 1600-6400 (push as needed)
• Focus: single-point AF with focus light, or manual focus
• White balance: depends on light source – auto with strobes, custom or RAW for ambient
• Strobes: usually yes, often combined with continuous lights for visibility

Underwater portraits (people)

• Aperture: f/4 to f/8 (wider to separate subject from background, narrower if you need full-body sharp)
• Shutter: 1/160 to 1/250
• ISO: 200-1600 depending on environment
• Focus: continuous AF for swimming subjects, single-point on the eye for held poses, eye detection if available
• White balance: auto with strobes or pool lights, RAW for ambient
• Strobes: optional. Yes for skin tone rendering, but watch for unflattering shadows. I do not usually use lights for portraits.

Settings for Specific Conditions

Conditions matter as much as subject. Here are starting points for the most common environments.

Bright tropical water (Caribbean, South Pacific, Red Sea)

Lots of available light, high contrast, generally clean water column. Easiest conditions to shoot in.

• Aperture: f/8 to f/11
• Shutter: 1/200 to 1/500
• ISO: 200-400 at 10m, 400-800 at 25m
• Strobes: optional for surface and shallow, recommended below 10m for color

Murky temperate water (California, UK, Pacific Northwest)

Lower visibility, lower light, more particulate. Harder conditions but the light has its own quality.

• Aperture: f/5.6 to f/8 (open up to gather light)
• Shutter: 1/125 to 1/200
• ISO: 800-3200
• Strobes: get close (within 1m), pull strobes outboard, lower power to reduce backscatter

Cold water (polar, deep temperate)

Often dramatically lit but technically demanding. Ice, kelp, low temperatures affecting both gear and your hands.

• Aperture: f/5.6 to f/8
• Shutter: 1/125 minimum, 1/250 if motion
• ISO: 1600-6400
• Battery management: cold drains batteries fast – bring spares, keep them warm
• Manual control practice: gloves slow your hands; pre-set as much as possible before the dive

Blue water / open ocean

Pelagic shooting. Big subjects (sharks, whales, mantas, sailfish), open water, often deep blue with no reference points.

• Aperture: f/5.6 to f/8
• Shutter: 1/500 to 1/1000 (subjects move fast)
• ISO: 400-1600
• Strobes: usually off. Subjects often outside strobe range; natural light reads better
• White balance: shoot RAW; the blue is the look

Pool work (portraits, controlled environments)

The most controllable environment. You can dial in exactly the look you want.

• Aperture: f/4 to f/8 (control depth of field for the look you want)
• Shutter: 1/125 to 1/250
• ISO: 200-800 (pool lights are usually decent)
• Strobes: optional. Often pool lights plus reflectors give a softer look. Strobes can add punch when needed
• White balance: pool water tends toward green; custom WB or RAW correction

Low visibility / silty water

The hardest conditions. Less than 3m of visibility means you cannot frame normally and backscatter is brutal.

• Aperture: f/5.6 to f/8
• Shutter: 1/125 to 1/250
• ISO: 1600-6400
• Strobes: get extremely close, very low power, pulled hard outboard. Or shoot ambient only and let the silt be part of the atmosphere
• Approach: shoot tighter than normal. Wide-angle work is impossible; macro and close portrait dominate

My Typical Starting Points: Quick Reference

Here is a condensed reference table you can refer to before dives. These are starting points, not absolute settings – adjust based on what the scene actually gives you.

Wide-angle reef, tropical, 10-20m, sunny

• f/8, 1/200, ISO 400, AWB, strobes optional

Wide-angle reef, tropical, 25-40m, mid-light

• f/8, 1/200, ISO 1600, AWB or RAW correction, strobes recommended

Macro, any depth

• f/16, 1/200, ISO 200, single-point AF, strobes essential

Pelagic shark in blue water, mid-depth, sunny

• f/6.3, 1/500, ISO 800, AF-C with eye detection, no strobes

Bull shark on a wreck, mid-depth, low ambient

• f/8, 1/250, ISO 800, AF-C, strobes essential

Humpback whale in clear blue water, surface, sunny

• f/5.6, 1/500, ISO 400, AF-C, no strobes

Underwater portrait, pool, controlled lighting

• f/5.6, 1/200, ISO 400, AF-C with eye detection, strobes or pool lights

Cave / wreck interior, very low light

• f/5.6, 1/100, ISO 3200, single-point AF with focus light, strobes plus continuous light

Night dive macro on reef

• f/16, 1/200, ISO 400, single-point AF with focus light, strobes essential

Common Settings Mistakes I See

1. Shutter speed too slow for ambient work. Hand-held at 1/60 underwater produces motion blur from your own movement. Stay above 1/125 for ambient work unless you specifically want blur.

1. Aperture too wide on dome ports. f/2.8 with a dome port produces visibly soft corners. f/8 or f/11 cleans it up.

1. ISO too low. Beginners afraid of noise often shoot at ISO 100 in conditions that need 1600. The result is motion blur. Push ISO higher.

1. Auto mode in challenging conditions. Auto exposure modes guess wrong underwater. Manual or aperture-priority gives you real control.

1. Not using burst mode for moving subjects. Single shot misses the perfect frame. Burst mode and pick the best.

1. Trying to use shutter speed for both motion and exposure simultaneously. Once you start using strobes, learn to separate the two: shutter for ambient, strobe power for foreground. Two independent dials.

1. Forgetting to check histogram between shots. The LCD lies underwater. The histogram does not.

1. Leaving the camera on land settings between dives. After a wide-angle dive, switching to a macro dive needs a complete settings refresh – aperture, shutter, ISO, focus mode, strobe power all change. Build a checklist or use a custom shooting mode preset for each subject type.

Where to Go From Here

Settings are tools. The more time you spend underwater, the more these become automatic. The point of memorizing a starting-point reference like this one is so that you can stop thinking about settings and start thinking about composition, light, and behavior – the things that actually make the difference between a documented dive and a real photograph.

Suggested next steps:

• • Read the field guide for the broader picture: How to Take Underwater Photos: A Photographer’s Field Guide 
  • Read How To Become an Underwater Photographer
  • Read about underwater portrait photography specifically when published (coming soon)
  • Sign up for my newsletter for new technical posts and field reports
  • Follow my work on Instagram @williamdrumm

Frequently Asked Questions About Underwater Photography Settings

What are the best camera settings for underwater photography?

There is no universal best – settings depend on subject, depth, light, and water clarity. As starting points: aperture f/8 to f/11 for wide and standard work, f/11 to f/22 for macro; shutter 1/125 minimum and 1/250-500 for moving subjects; ISO 400-800 in good tropical light and 1600-3200 in deeper or dimmer conditions; always shoot RAW; use continuous AF for moving subjects and single-point AF for portraits and macro.

What aperture should I use for underwater photography?

Wide-angle work in dome ports: f/8 to f/11 for sharp corners. Standard zooms for portraits and mid-range: f/5.6 to f/8. Macro work: f/11 to f/22 because magnification dramatically reduces depth of field. Open apertures (f/2.8, f/4) on dome ports produce noticeably soft corners and should usually be avoided.

What shutter speed should I use underwater?

Minimum 1/125 for static subjects to avoid motion blur from your own movement. 1/250 for slow-moving subjects. 1/500 to 1/1000 for fast subjects like sharks, dolphins, and fish hunting. With strobes, shutter speed also controls ambient (background) exposure independent of strobe power – faster shutter equals darker background.

What ISO should I use for underwater photography?

Push higher than you think. Modern full-frame sensors handle ISO 1600-3200 cleanly and ISO 6400 is usable. Starting points: ISO 200-400 in bright tropical surface water, 400-800 at mid-depth tropical, 1600-3200 in deeper or dimmer conditions, and 3200-6400 in caves, wrecks, and night dives. A noisy sharp photo can be cleaned in post; a blurry low-noise photo cannot be saved.

What white balance setting is best for underwater photography?

If you shoot RAW (recommended), use auto white balance and correct in post. RAW preserves all the color data and white balance becomes a slider in Lightroom. If you shoot JPEG, set custom white balance manually using a white slate or gray card at the depth where you are shooting. With strobes lighting the foreground, auto white balance works well because the camera reads the strobe-lit subject rather than the ambient blue water.

Should I shoot RAW or JPEG underwater?

RAW. The flexibility to fix white balance, recover highlights, lift shadows, and adjust color underwater is essential. Underwater images almost always need significant post-processing, and RAW gives you that latitude. JPEGs lock in white balance and tonal decisions made by the camera in conditions the camera was not designed for. Storage is cheap. Shoot RAW.

Do I need a custom white balance underwater?

Only if you are shooting JPEG. If you shoot RAW, you can correct white balance in post-processing more precisely than the camera could in-camera. Custom white balance does help video work where you cannot fix every frame in post, and it is essential for JPEG shooters at depth.

What is the best autofocus mode for underwater photography?

Continuous AF (AF-C / AI Servo) for moving subjects like fish, sharks, and dolphins. Single-point AF (AF-S / One Shot) for portraits and macro where precision matters more than tracking. Manual focus for difficult conditions like extreme low light, low visibility, or very small macro subjects. Modern cameras with animal-eye detection AF work on fish about 70% of the time when conditions are reasonable.

Why are my underwater photos so blue?

Water absorbs red light first, then orange, then yellow, leaving everything blue or green. The deeper you go, the more dramatic the effect. Two solutions: shoot RAW and warm up the white balance in post-processing, or use strobes which provide full-spectrum light that restores the colors water has stripped away. Auto white balance in-camera struggles with this because algorithms are designed for land-based light.

What settings work best for a GoPro underwater?

Shoot in the highest resolution you can. Use a red filter at depth (2-10m and beyond) to restore some color. Use the camera’s “underwater” or “diving” preset if available. Stabilization on. Photo mode rather than HDR for natural-looking files. For low-light situations, switch to wide field of view to gather more light. The GoPro’s relatively small sensor limits low-light performance – get close to your subject and use natural light from the surface where possible.