Guides & Tutorials

Setting the Inon S-220 with Your Camera – A 2026 Guide

January 23, 2026
By Ran Mor
24 Comment

The Inon S-2000 has been one of the most popular underwater strobes since it was released in 2009 — and even in 2026, it’s still widely used by compact and mirrorless shooters.

Over the years, Inon evolved this compact strobe line from the S-2000 to the D-200 and now the S-220. The setup logic remains very similar across all three, and that’s exactly where the confusion continues.

Setting it up is simple once you understand what each setting does.

The biggest point of confusion?

That small magnetic switch on the back.

Let’s clear it up once and for all.

Inon S-2000

Quick Setup Cheat Sheet

If you just want the short answer:

If your camera uses preflash → Remove the magnet
If your camera flash is set to manual power (no preflash) → Install the magnet
If you’re using S-TTL Auto mode → The magnet setting does not matter

Now let me explain why.

What Does the Magnet Switch Do?

The magnet switch is the small screw and magnet included with your strobe. It fits into the hole on the right side of the back panel.

Its job is simple:

It tells the strobe whether to expect a preflash from your camera.

Preflash → Magnet removed
No preflash → Magnet installed

That’s it.

Nothing mystical. No hidden modes.

Just preflash detection.

What Is Preflash?

Preflash is a very quick, low-power flash that fires before the main flash. Your camera uses it to measure exposure and calculate how much power the final flash should use.

It happens so fast that most people don’t even notice it.

Important:

Preflash is NOT the same as red-eye reduction.

Red-eye reduction must always be turned OFF when shooting underwater with any Inon strobe.

Does This Apply to the S-220?

Yes.

The S-220 uses the same optical triggering logic as the S-2000 and D-200 when operating in S-TTL or manual optical mode.

So the magnet rule still applies exactly the same way:

Preflash → Magnet removed
No preflash → Magnet installed

What changed with the S-220 is not the magnet logic — it’s performance.

What Makes the S-220 Different?

The S-220 is a more modern, higher-performance compact strobe designed to keep up with today’s mirrorless systems.

Key specs:

Guide Number: 22 (ISO 100/m)
Beam Angle: 140° (without filter)
12-step Manual Control (GN 22 down to 3.5)
S-TTL Auto Mode
Recycle Time: approx. 2.1 seconds (Eneloop)
Depth Rating: 100m / 328ft
Uses 4x AA batteries (Eneloop recommended)
463g with batteries (nearly neutral underwater)
Glow-in-the-dark rear panel for night dives

It also includes the Strobe Dome Filter S [SOFT] and ND filter for beam control.

If you’re buying new in 2026, the S-220 is the natural evolution of the S-2000 line.

Is the S-220 Powerful Enough?

This is one of the most common questions I get.

Here’s the simple rule I use:

Shooting macro → More than enough power.
Shooting reef scenes within 1–2 meters → Excellent coverage.
Shooting wide angle or larger subjects → Consider using two strobes.

With a 140° beam angle and Guide Number 22, the S-220 hits a very nice balance between compact size and real output.

For compact and mirrorless shooters, it’s a strong all-around choice.

Common Setup Mistakes

Most issues people experience aren’t hardware problems — they’re setup mistakes.

The most common ones:

Leaving red-eye reduction turned ON.
Installing the magnet while using preflash.
Forgetting to match camera flash mode to strobe mode.
Assuming S-TTL eliminates positioning errors.

If your exposure looks inconsistent, always check your camera flash settings first.

Final Thoughts

The magnet switch confusion has followed the S-2000, D-200, and now the S-220 for years — but once you understand preflash, it becomes very simple.

Remember:

Preflash = magnet removed.
No preflash = magnet installed.

That’s the foundation.

Once your setup is correct, everything else comes down to positioning and light control — and that’s where creativity begins.

If anything here feels unclear, feel free to email me at [email protected] and I’ll be happy to help.

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Ran Mor

Sales and Marketing at Mozaik Underwater Cameras

Ran is a professional photographer for over 14 years. His passion for scuba diving and photography has pushed him to combine his profession and hobby and become a professional underwater photographer. Teaching is one of his greatest passions and over the years he has shared his experience with many divers and aspiring photographers. Along with his wife Danielle, an experienced Scuba Instructor, they have founded Dive and More, leading dive trips and UW photo workshops all over the world. Ran is also an electrical engineer and an avid internet marketing specialist.
Visit his personal portfolio at www.ranmorphoto.com.