Best Waterproof & Underwater Camera Housing for Sony A5100 and Similar Cameras
Aug 27, 2026
Best Waterproof & Underwater Camera Housing for Sony A5100 and Similar Cameras
Sony A5100 Underwater Housing & Waterproof Camera Case Compatibility Guide
Yes — the Sony A5100 is compatible with the Outex waterproof camera housing system.
The Sony Alpha A5100 remains an interesting choice for underwater photography because it combines a 24.3-megapixel APS-C sensor, interchangeable Sony E-mount lenses and a remarkably compact body. For photographers who already own an A5100—or who want to put a smaller, lightweight mirrorless camera to work around water—the combination can deliver image quality and lens flexibility far beyond a typical waterproof compact camera or smartphone.
Pairing the Sony A5100 with the universal Outex Camera Pro Kit lets photographers take the camera into swimming pools, surf, snorkeling, boating, waterfalls, rain, snow, sand, mud and other environments where an unprotected camera would be vulnerable.
And because Outex isn't molded around one specific camera body, the waterproof system doesn't become an A5100-only investment. Use the A5100 today and move later to another Sony Alpha—or a compatible Canon, Nikon, Fujifilm, Panasonic or other camera—while continuing to reuse compatible Outex components.
Sony A5100 + Outex Compatibility at a Glance
| Feature | Sony A5100 + Outex |
|---|---|
| Compatibility | ✓ Compatible with Outex |
| Camera type | APS-C mirrorless |
| Sensor | 24.3 MP APS-C Exmor CMOS |
| Lens mount | Sony E-mount |
| Recommended system | Outex Camera Pro Kit |
| Lens port size | Determined by the lens being used |
| Supported filter-thread sizes | 49–105 mm plus step-up-ring options |
| Dome compatible | Yes — depending on lens/setup |
| Tripod compatible | Yes — Tripod Add-on available |
| Tethering compatible | Yes — cable/tethering options available |
| External lighting/flash | Available through modular Outex accessories |
| Waterproof | 10 m / 33 ft |
| Change cameras later | Yes — reuse the modular Outex system |
Why Use the Sony A5100 Underwater?
The A5100's biggest advantage around water may be its combination of small size and a comparatively large APS-C sensor.
Sony built the A5100 around a 24.3-megapixel Exmor CMOS APS-C sensor measuring approximately 23.5 × 15.6 mm. Unlike a fixed-lens waterproof compact, however, the A5100 uses Sony's interchangeable E-mount lens system.
That means photographers can choose the lens according to the shot instead of being permanently tied to one built-in lens.
It's an appealing combination for applications including:
- underwater portraits
- swimming and pool photography
- snorkeling
- surfing and watersports
- kayaking and paddleboarding
- fishing and boating
- travel and adventure photography
- family photography around water
- waterfalls and rivers
- split-level over/under photography
- rain, snow, sand and dust protection
The A5100 body itself is particularly small. Sony lists it at approximately 4.32 × 2.47 × 1.41 inches and about 9.98 oz with battery and media. That can make an A5100 + Outex combination especially appealing for travel and situations where minimizing equipment size and weight matters.
Suggested ALT: Sony A5100 underwater housing with Outex waterproof camera case
A Compact Camera That Still Gives You APS-C Image Quality
One reason the A5100 remains relevant despite being an older Sony model is that its basic imaging proposition is still useful.
You're getting a 24.3 MP APS-C interchangeable-lens camera in an exceptionally compact package.
For someone who already owns an A5100, that creates an interesting alternative to buying another camera specifically for water.
Instead of retiring an older camera body, Outex can give it an entirely new job.
An A5100 that may spend most of its time sitting in a camera bag can become a dedicated camera for pool photography, travel, snorkeling, surf, boating, fishing, adventure and creative underwater imaging.
That can also make the camera easier to put into situations where you might hesitate to take your newest or most expensive body.
Sony A5100 Autofocus Underwater
Moving subjects are challenging around water, and the A5100 has more sophisticated autofocus than its compact dimensions might suggest.
Sony's Fast Hybrid AF combines phase-detection and contrast-detection autofocus. The camera uses 179 phase-detection AF points and 25 contrast-detection points, along with AF-C continuous autofocus, Lock-on AF and Eye AF.
That makes the A5100 especially interesting for photographing subjects such as swimmers, children in a pool, surfers, marine life and other moving subjects.
Water introduces additional variables—movement, reflections, bubbles, reduced contrast and changing light—so no autofocus system eliminates the challenges of underwater photography. But having continuous and tracking autofocus available gives an interchangeable-lens camera such as the A5100 capabilities that can be very useful in these environments.
Suggested ALT: Describe the actual subject naturally—for example, underwater swimmer photographed using Sony mirrorless camera and Outex housing.
Sony A5100 Video Underwater
The A5100 also records video, making it useful for creators who want both still images and underwater footage from one camera.
Sony supports XAVC S Full HD recording at up to 1920 × 1080/60p at 50 Mbps, along with other 1080 recording options.
No, the A5100 isn't a modern 4K/120p video camera like newer Sony bodies.
But that's not necessarily the point.
For pool footage, travel, snorkeling, behind-the-scenes content, social media, family videos, technique analysis or general underwater filmmaking, clean Full HD footage can still be entirely useful.
And this is where Outex's universal approach becomes important: if video requirements eventually push you toward an A6700, FX3 or another Sony body, the waterproof system doesn't necessarily have to be discarded with your A5100.
Why Outex Instead of an A5100-Specific Hard Underwater Housing?
Conventional underwater housings are generally designed around the shape, dimensions and control locations of one specific camera.
That's useful while you're using that camera.
But the Sony A5100 illustrates one of the problems particularly well.
Cameras change quickly. Housings don't.
If you purchased a rigid housing specifically molded for an A5100 years ago and subsequently moved to an A6400, A6600, A6700 or another system, that camera-specific housing generally doesn't move with you.
Outex takes a different approach.
The patented Outex system uses a malleable waterproof cover rather than a rigid camera-shaped enclosure. The flexible material provides tactile access to camera and lens controls, while optical-glass front and rear ports maintain the optical path and viewing access.
The Outex Camera Pro Kit provides:
- front optical glass
- rear optical glass
- tactile camera and lens control
- LCD viewing through the rear glass
- interchangeable components
- tripod options
- dome options
- lighting and flash options
- cable/tethering options
- waterproof protection to 10 m / 33 ft
Outex is compatible with virtually all DSLR, mirrorless, film, medium-format and cinema camera systems. That modularity means an Outex investment can continue working long after a particular camera body has been replaced.
Choosing the Right Lens and Outex Port for the Sony A5100
This is one of the most important things to understand when configuring Outex:
The camera determines the housing configuration. The lens determines the front glass port.
The Sony A5100 uses Sony E-mount interchangeable lenses, so there isn't one "Sony A5100 port size."
Instead:
Sony A5100 → E-mount lens → lens filter-thread diameter → corresponding Outex optical-glass port
Outex Camera Pro Kits currently offer front glass ports for standard filter-thread sizes from 49 mm through 105 mm, with step-up-ring options for additional combinations.
The filter-thread diameter is normally printed on the lens itself or lens cap and is represented by a diameter symbol such as:
Ø49, Ø55, Ø67, Ø72, etc.
It is not the same as the lens focal length.
So a "50 mm lens" does not necessarily require a 50 mm port.
Example: Sony 16–50 mm Kit Lens
Many A5100 cameras were sold with Sony's compact E PZ 16–50 mm OSS kit zoom.
If that's the lens you're using, identify its actual filter-thread diameter and select the corresponding Outex front port rather than selecting a port based on the lens's 16–50 mm focal-length designation.
If you're unsure, provide Outex with:
Camera: Sony A5100
Lens: exact Sony/Sigma/Tamron/etc. model
Filter thread: if known
and the appropriate configuration can be determined before use.
What Type of Lens Works Best Underwater?
That depends entirely on the subject.
Wide-Angle Lenses
Wide lenses are often useful underwater because they allow photographers to move closer to a subject while maintaining a large field of view. Less water between the camera and subject can often improve apparent clarity and contrast.
They're particularly useful for:
- swimmers
- underwater portraits
- surf
- marine life
- reefs and environments
- boats
- pools
- travel photography
- over/under images
Standard Zooms
A compact zoom can make the A5100 an excellent general-purpose water camera for swimming pools, family use, boating, fishing, kayaking and travel.
Ultra-Wide and Fisheye Lenses
Very wide lenses can be excellent candidates for a dome configuration, depending on the lens design and desired image.
The important point is that Outex doesn't lock the Sony A5100 into a single lens choice.
Flat Port or Dome Port for the Sony A5100?
Both are possible.
Flat Optical-Glass Port
For general underwater photography, swimming pools, snorkeling, kayaking, boating, rain, sand and other environmental protection, the standard Outex flat optical-glass port is an excellent starting point.
Outex uses optical glass rather than acrylic/plastic for its image path.
The front glass attaches according to the lens filter thread and moves with the lens, helping keep the port properly positioned relative to the optics.
Optical-Glass Dome
For wide-angle and split-level/over-under photography, an Outex optical-glass dome can be added.
Outex offers interchangeable dome adapters for conventionally threaded lenses as well as clamp solutions for certain lenses without normal front filter threads.
That means the dome is configured around the lens rather than around the A5100 body itself.
Explore the Outex Pro Kit + Dome Lens Port
See How the Outex Waterproof Camera System Works
The flexible Outex approach is easier to understand once you see it being used.
Watch the Outex underwater camera housing demonstration on YouTube
The demonstration shows the fundamental difference between Outex and a traditional hard housing: the photographer can physically operate the camera through the flexible waterproof cover while the optical ports maintain clear imaging and viewing paths.
The exact camera shown in a demonstration doesn't have to be an A5100 because the same system architecture is designed to work across camera brands and models.
A Useful Feature of the A5100: Its 180° Touchscreen
Sony equips the A5100 with a 3-inch touchscreen that can tilt upward approximately 180 degrees.
That was originally intended partly for flexible composition and self-portraits, but the compact screen-based design also reinforces what makes the A5100 appealing as a lightweight imaging platform.
Unlike many larger Sony Alpha bodies, the A5100 doesn't have a traditional built-in electronic viewfinder. Composition is therefore primarily through its rear LCD.
When configuring and using an Outex system, you'll view and operate the camera through the rear optical-glass area and tactile cover.
It's worth practicing your controls and screen position on dry land before entering the water so that your preferred settings are already familiar.
Tripod, Tethering and External Lighting
A small A5100 doesn't mean you're limited to simple handheld shooting.
The modular Outex system can expand with the same kinds of accessories available to users of larger professional cameras.
Underwater Tripod
An Outex Tripod Add-on can be useful for:
- fixed underwater camera positions
- swimming technique filming
- pool portraits
- remote compositions
- controlled productions
- repeatable framing
Cable & Tethering Pass-Through
Outex offers waterproof cable pass-through configurations for specialized workflows involving compatible:
- data
- power
- video
- audio
- external displays
- remote workflows
Sony lists PC Remote functionality and Multi/Micro USB connectivity for the A5100. The exact cable and camera function should be verified for your intended workflow before building a specialized tethering setup.
Flash and Lighting
The Outex system can also accommodate external lighting and triggering accessories where appropriate.
Explore Outex Camera Accessories
Recommended Outex Setup for the Sony A5100
Best Overall Choice: Outex Camera Pro Kit
For most Sony A5100 users, start with the Outex Camera Pro Kit.
It includes:
- flexible Outex Pro Cover
- front optical-glass port
- rear optical-glass port with universal tripod-mount attachment
- tactile access to camera and lens controls
- LCD viewing
- compatibility with modular Outex accessories
- waterproof protection to 10 m / 33 ft
Configure the Outex Camera Pro Kit
Want an Even Smaller, Simpler Setup?
Because the A5100 is such a compact camera, some users may also want to compare Outex configurations according to the particular lens and intended use.
The important thing is to configure the complete camera + lens combination, not simply buy according to the camera name.
Explore Outex Camera Housing Options
For Over/Under Photography
Consider adding the Outex optical-glass dome when your lens and photography style call for it.
Sony A5100 Underwater Housing FAQ
Is the Sony A5100 compatible with Outex?
Yes. The Sony A5100 is compatible with the universal Outex waterproof camera housing system.
Is the Sony A5100 waterproof by itself?
No. The A5100 should be protected from water before being used in a pool, ocean, rain or similarly wet environment. Outex provides the waterproof barrier around the camera and lens.
Which Outex lens port do I need for a Sony A5100?
The correct port depends on the lens, not the A5100 camera body. Identify the filter-thread diameter on your exact E-mount lens and choose the corresponding Outex optical-glass port.
Can I use the Sony 16–50 mm kit lens?
Yes, subject to selecting the correct port and configuration for the particular lens. Use the filter-thread diameter—not the 16–50 mm focal-length numbers—to determine the relevant front-port size.
Can I operate the A5100 while it's inside Outex?
Yes. Outex is designed to provide tactile access to camera and lens controls through the flexible cover.
Can I see the A5100 screen through Outex?
Yes. The Camera Pro Kit uses a rear optical-glass port for viewing the camera's LCD.
Can I use an Outex dome with the Sony A5100?
Yes. Dome compatibility is determined primarily by the lens and intended photographic setup rather than the A5100 body itself.
Can I mount the Sony A5100 on a tripod underwater?
Yes. Outex provides tripod-compatible configurations and an underwater Tripod Add-on.
Can I tether the Sony A5100 while using Outex?
Outex provides waterproof cable pass-through options. Sony's A5100 supports PC Remote and Multi/Micro USB connectivity, but confirm the particular cable, software and desired camera function before configuring a specialized workflow.
How deep can I take my Sony A5100 with Outex?
The Outex Camera Pro Kit is waterproof to 10 meters / 33 feet.
Is an older Sony A5100 still worth using underwater?
Potentially, yes—and that's one of the more interesting reasons to pair it with Outex.
The A5100 still provides a 24.3 MP APS-C sensor and interchangeable E-mount lenses in an extremely compact body. If you already own one, converting it into a dedicated water/adventure camera can create an entirely new use for equipment you already have.
What happens if I upgrade from the A5100?
That's where the universal Outex architecture becomes especially valuable.
Move to an A6400, A6600, A6700, A7-series camera or another compatible body and many of your Outex components can continue to be used. You configure the system around the new camera and lens rather than automatically replacing an entire camera-specific hard housing.
Sony A5100 vs. Sony A6700 for Underwater Photography
If you're deciding between the A5100 and a newer A6700, these cameras serve somewhat different photographers.
The A5100's advantage is simplicity, compact size and the ability to put an existing or relatively inexpensive APS-C camera into a new environment.
The A6700 is dramatically more advanced, adding newer autofocus technology, in-body image stabilization, a newer 26 MP sensor and substantially more powerful 4K video capabilities.
But both share something important:
Sony APS-C E-mount lenses and compatibility with the universal Outex housing architecture.
So upgrading cameras doesn't necessarily mean starting your waterproof system over.
Read: Best Waterproof & Underwater Camera Housing for Sony A6700
This reciprocal internal link is important: add a link from the existing A6700 article back to this A5100 guide as well.
Other Sony Cameras Compatible With Outex
Looking for a different Sony camera?
Outex can accommodate a broad range of Sony mirrorless and cinema cameras, including:
Sony A5100 | A6000 | A6100 | A6300 | A6400 | A6500 | A6600 | A6700 | A7 Series | A7R Series | A7S Series | A7C Series | A9 Series | A1 Series | FX3 | FX30 | ZV-E10 and others.
As you publish individual Outex compatibility guides for those models, convert their names into internal links.
That creates a Sony camera compatibility content cluster rather than isolated blog posts and gives both visitors and search engines clear paths between related equipment.
Give Your Sony A5100 a New Life Around Water
The A5100 may not be Sony's newest camera.
That can actually be part of its appeal.
Its compact body, 24.3 MP APS-C sensor, interchangeable E-mount lenses and capable autofocus system mean there's still plenty of imaging potential inside a camera that many photographers already own.
Instead of leaving it on a shelf—or buying another camera specifically for use around water—you can turn the A5100 into a compact underwater, surf, pool, boating or adventure camera.
And because Outex isn't built exclusively around the A5100, the waterproof system can continue with you when the camera eventually changes.
Use the Sony A5100 today. Upgrade tomorrow. Keep your Outex.
Ready to waterproof your Sony A5100?
Build Your Outex Camera Pro Kit
Not sure which optical-glass port you need? Provide Outex with your Sony A5100 and exact lens model/filter-thread diameter and we'll help determine the appropriate configuration.