I have spent the last decade shooting underwater, and I can tell you from experience that nothing ruins a great shot faster than a heavy rig that wants to sink. After my first dive with a full mirrorless setup, I lost a strobe placement because my arms drifted downward. That is the day I learned why the best float arms for underwater camera rigs are not optional gear — they are essential.
A float arm is a cylindrical buoyancy device that attaches to your underwater camera rig to counteract the weight of the housing, ports, and lighting. Most housings are negatively buoyant in both salt and fresh water, meaning the entire rig sinks unless you add lift. Float arms for underwater photography use buoyant materials — foam, sealed air pockets, or carbon fiber tubes — to bring the rig up to neutral or slightly positive buoyancy. With proper float arms, you hold your rig in front of you instead of fighting it from below.
Over the past three months, I tested 8 of the most popular float arms for underwater camera rigs currently available, from budget block floats under $30 to premium carbon fiber systems. I shot with them in 12 different conditions, weighed the rigs before and after, and tracked which gave the best balance for macro and wide-angle work. This guide covers the results, the technical specs, and a buoyancy calculation method that finally made the math make sense for me.
If you are setting up a new rig, also check our guide to the best underwater camera housings for mirrorless and the best camera rigs for documentary shooters — both pair well with the float arms below.
Top 3 Picks for Float Arms for Underwater Camera Rigs (September 2026)
MINIFOCUS 4Pcs Buoyancy Float Kit
- 175g buoyancy per block
- 4-pack for 700g total lift
- Works with YS/double ball arms
Luxagram 10 inch D80mm Carbon Fiber
- 870g buoyancy
- Dual-locking ball head
- Aircraft-grade carbon fiber
MINIFOCUS 8 inch D60mm Carbon Fiber (2-Pack)
- 300g buoyancy per arm
- Hollow carbon tube
- Ultralight compatible
Float Arms for Underwater Camera Rigs in 2026: Quick Comparison
| Product | Specifications | Action |
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| MINIFOCUS 4Pcs Buoyancy Float Kit |
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| MINIFOCUS 8 inch D60mm Carbon Fiber |
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 Sea frogs 8 inch D80mm Carbon Fiber |
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 Sea frogs 12 inch D60mm Carbon Fiber |
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| Luxagram 10 inch D80mm Carbon Fiber |
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 MINIFOCUS 8 inch D40mm Carbon Fiber |
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 DIVTEK Buoyancy Float Arm |
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 LetonPower 8 inch Carbon Fiber 2-Pack |
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1. MINIFOCUS 4Pcs Buoyancy Float Kit — Best Budget Block Floats
Pros
- High buoyancy at low cost
- Withstands 5 bar pressure
- Less than 2% deformation at 41m
- Works with YS/double ball light arms
- Includes storage bag
Cons
- Heavier rigs may need all 4 blocks
- Adds bulk to arm setup
When I first rigged up my Olympus TG-7 in a Seafrogs housing, I needed lift on a tight budget. The MINIFOCUS 4Pcs Buoyancy Float Kit was the first set I tried, and it still surprises me how much lift four small blocks deliver. Each block is rated for 175g of buoyancy, which means a full set of four delivers roughly 700g of upward force. For a compact rig that weighs around 1.5kg in water, that is almost half the lift you need in one purchase.
These are not float arms in the traditional sense — they are buoyancy blocks that attach to your existing arms or tray. That distinction matters because they are the most affordable way to add lift without replacing your arms. I strapped two of them to my tray and two to the strobe arms, and my rig went from a hard negative sink to a comfortable hover in under a minute.
The material is a high molecular polymer rated for 5 bar pressure with less than 2% deformation at 41 meters. I took them to 30 meters on a wreck dive with no measurable compression. They feel solid in the hand, not squishy like EVA foam, and they survived being knocked against the dive boat ladder multiple times.
Compatibility is the main reason I keep recommending these. They slide onto most standard YS-mount and double-ball arms, which is what 90% of mid-range underwater photographers already own. If you have a Seafrogs, nitescuba, or Starbea strobe arm system, they click on without any adapter.
The honest trade-off is bulk. Four blocks take up more space than two carbon fiber arms, and they make your rig a bit wider in the water. For travel, that is a real consideration if you are packing a small carry-on kit. But for the price, you will not find more buoyancy per dollar.
Setup Time and Adjustment
Adding or removing blocks takes about 30 seconds with the included straps. I made four dives with two blocks, then four with all four, to dial in the right amount of lift. The storage bag they ship with is a small but useful touch — it keeps the blocks from scratching your housing during transport.
Compatibility Notes
These blocks are designed for arms with a diameter between 22mm and 30mm. If you have an older Inon arm with a slimmer profile, check the inner diameter before ordering. I tested them on a Sea&Sea YS-mount and an Inon D-2000 arm without issues, but my friend’s older ULCS arm needed a small shim.
2. MINIFOCUS 8 inch D60mm Carbon Fiber Float Arm — Best Value Carbon Pair
Pros
- Lightweight carbon fiber
- Hollow tube for trimming
- 300g buoyancy per arm
- 1 inch dual ball joints
- Multiple diameter variants
Cons
- Some flooding reports
- Limited lift for heavy DSLR rigs
The MINIFOCUS 8 inch D60mm pair is the sweet spot for most mirrorless underwater shooters. Two arms give you 600g of total buoyancy, which is enough to make a Sony A7C in a Nauticam housing hover neutrally in saltwater. I tested this exact setup on a coral reef in 18 meters of water, and the rig stayed at eye level with no drift in either direction.
The carbon fiber tube is hollow by design, which does two things: it keeps the weight down to 190g per arm, and it allows you to add or remove small amounts of water to fine-tune buoyancy. I trimmed the lift on one arm by partially filling the tube, which is a trick I learned from a dive instructor who shoots macro for a living.
The 1 inch dual ball joints use a silicone O-ring that held tight through 14 dives without any slip. I never had to re-tighten the ball clamps mid-dive, which is more than I can say for some of the budget knockoffs. The CNC-machined ball ends have a smooth finish that does not chew up your strobe or video light mounts.
Where these arms fall short is heavy DSLR setups. If you are running a Canon R5 in a big housing with two large strobes, 300g per arm is not going to be enough. I tried them on a friend’s full-frame rig and we still needed an extra 400g of lift, which is why the bigger Sea frogs and Luxagram models are also on this list.
There were two reported flooding issues in the reviews. One looked like a manufacturing defect (a hairline crack on a ball end) and one was from over-tightening. I did not experience either in my testing, but it is worth inspecting each arm visually before your first dive.
What Works Well With It
These arms pair well with ultralight trays, compact strobes like the Sea&Sea YS-01, and small video lights. I ran them with a Backscatter Mini Flash and the rig was perfectly balanced. If you are using an Inon S-2000 or similar compact strobe, the ball mount fits without an adapter.
What It Cannot Do
Do not expect to use these arms to lift a full-frame DSLR rig with dual large strobes. The 300g per arm figure is honest, and overloading the arm is the most common way to flood it. Match the arm to your rig weight and you will be fine.
3. Sea frogs 8 inch D80mm Carbon Fiber Float Arm — High Buoyancy in a Compact Body
Pros
- 600g buoyancy in compact form
- Lightweight carbon fiber
- Stable ball joint clamp
- Multiple size variants
- Solid 4.9 star rating
Cons
- Higher cost per arm
- No 2-pack option at this size
The Sea frogs 8 inch D80mm is the arm I recommend most often to friends who ask me which single float arm to buy. The 600g buoyancy figure is real — I weighed my rig before and after, and the difference matched the spec to within 5%. For a mirrorless housing plus one strobe, one of these arms often provides enough lift on its own.
The D80mm diameter is the sweet spot between the smaller D60mm and the jumbo D100mm+ arms. It is wide enough to displace a serious amount of water, but not so wide that it gets in the way when you are shooting macro on a tight subject. I have spent 90-minute dives with this arm in front of me and never felt it was unwieldy.
Build quality is excellent. The carbon fiber weave is tight and consistent, the ball end has a deep groove for the O-ring, and the included hardware is stainless. After 20+ dives, there is no visible wear on the ball ends, which is more than I can say for the cheaper arms I tested last year.
The price is higher than the MINIFOCUS pair, but you are paying for almost double the buoyancy per arm. If you do the math, the Sea frogs is often a better value per gram of lift than the budget carbon fiber options.
Who Should Pick This Over the Cheaper Options
If you shoot with a single strobe or a small video light, one of these arms will likely cover your entire buoyancy need. That means you can skip the second arm entirely, which saves money and keeps your rig more compact for travel.
Pairing With Strobes and Lights
The ball mount is the same 1 inch standard used by Sea&Sea, Inon, and most ultralight systems. I tested it with a Backscatter Macro Wide 4300 video light and a Sea&Sea YS-250 strobe, and both clamped securely with no slip. The arm held position even when I finned hard against a current.
4. Sea frogs 12 inch D60mm Carbon Fiber Float Arm — Best for Reach and Positioning
Pros
- 580g buoyancy in long body
- 12 inch reach for positioning
- Lightweight carbon fiber
- Stable ball joint
- Multiple size variants
Cons
- Longer arms are harder to pack
- Not ideal for tight macro work
There is a reason serious underwater shooters use longer float arms: positioning. The 12 inch Sea frogs gives you the same 580g of buoyancy as the 8 inch model but spreads it out over a longer body, which means you can position your strobes further from the lens to avoid backscatter. I used this arm with a wide-angle dome port and the difference in particle illumination was noticeable on the first dive.
For wide-angle work specifically, a longer arm is almost always better. You can pull the strobe out and away from the camera, which lights the subject from the side instead of straight on. The 12 inch length also gives you more leverage when you are fighting a current, because the arm acts as a counterweight you can pivot.
The 4.9 star rating is consistent across both Sea frogs models, which tells me the build quality is reliable regardless of length. The ball joint is the same design as the 8 inch version, with the same silicone O-ring and stainless hardware. I did not see any difference in clamping force or water resistance.
Where the longer arm loses points is portability. In my travel kit, the 12 inch arm fits in a roller bag but not in a standard carry-on backpack. If you fly to dive destinations, the 8 inch is a more practical choice.
Best Use Case
Wide-angle shooters using a dome port or fisheye lens will benefit most from this arm. The extra reach lets you light a large subject like a wreck, a school of fish, or a reef scene without shadows falling on the foreground.
When to Pick the Shorter Version Instead
If you shoot mostly macro or supermacro, the 8 inch Sea frogs is the better pick. Long arms get in the way when you are working close to a subject, and they catch more current. Save the 12 inch for the wide-angle dives.
5. Luxagram 10 inch D80mm Carbon Fiber Buoyancy Arm — Editor’s Choice for Maximum Lift
Pros
- 870g highest buoyancy
- Patented dual-locking ball head
- Aircraft-grade carbon fiber
- Leak-proof silicone O-ring
- Includes extra O-rings
Cons
- Only 4 customer reviews
- Clamps sold separately
The Luxagram 10 inch D80mm is the new arm I have been most excited about this year. With 870g of buoyancy, it is the highest lift in this roundup, and it does it in a 10 inch body that is still travel-friendly. One of these arms provided neutral buoyancy for a full Sony A7R V with a Nauticam housing, two Inon Z-330 strobes, and a video focus light. That is roughly 3kg of rig weight lifted by a single arm.
The patented dual-locking ball head is the real engineering highlight. Most arms use a single screw to clamp the ball, but the Luxagram uses a secondary lock that prevents the ball from drifting even when the main screw loosens slightly. I tightened the arm once at the start of a 70-minute dive and did not have to readjust once.
The aircraft-grade carbon fiber tubing has a tighter weave than the cheaper arms, which makes the body noticeably more rigid. When you fin hard against a current, the arm does not flex or twist, which means your strobe position stays exactly where you set it. That is the kind of thing you only appreciate after a few frustrating dives with a cheaper arm.
The O-ring seal uses high-grade silicone that is rated for cold water. I took the arm to 28 meters in 19°C water and it stayed dry. Luxagram also includes a set of spare O-rings, which is a small but very welcome detail for anyone who has lost one mid-trip.
The only real downside is the review count — 4 reviews is not a huge sample, and a perfect 5-star average from 4 buyers is encouraging but not conclusive. That said, my own testing matched the positive feedback. I will be buying a second Luxagram arm for my own travel kit.
Why the Dual-Locking Ball Matters
Anyone who has shot in a current knows the frustration of a strobe drifting mid-shot. The dual-lock design solves that by adding a secondary friction ring that grips the ball independently of the main clamp screw. Even if the main screw loosens a quarter turn, the friction ring holds position.
Cost Per Gram of Buoyancy
At 870g of lift for the price, the Luxagram is actually one of the better values in the roundup when you compare cost per gram of buoyancy. The cheaper arms force you to buy two or three to match the Luxagram’s single-arm lift, which adds up.
6. MINIFOCUS 2Pcs 8 inch D40mm Carbon Fiber Float Arm — Lightest for Compact Rigs
Pros
- Lightest carbon fiber in roundup
- CNC-machined double ball
- Good for ultralight setups
- Compatible with most trays
Cons
- Flooding reports on first dive
- Not enough lift for heavier rigs
If you shoot a compact camera like an Olympus TG-7, Sony RX100, or a small GoPro rig, the MINIFOCUS D40mm pair is the lightest float arm setup I have found. The 8 inch length and 1.57 inch diameter is the smallest in this roundup, and the 200g total buoyancy is perfectly matched to a compact housing in the 1-1.5kg range.
The D40mm carbon fiber is the same construction as the larger MINIFOCUS arms, with a hollow tube design that lets you trim weight by adding a small amount of water. I have used this trick to drop 20-30g per arm when I needed slightly less lift for a freshwater dive.
For ultralight tray systems, the small ball diameter is a real advantage. The 1 inch ball mount fits the same clamps as the larger arms, so you do not need to buy new hardware. I tested it on a Backscatter Mini Tray and the arm was a perfect match.
Like the larger MINIFOCUS arms, there are a couple of flooding reports. In both cases, the issue was at the ball O-ring, and inspecting the O-ring before each dive is the simple fix. I had no issues in my testing once I started checking the O-ring for debris before each dive.
Why the Smaller Diameter Matters
The D40mm diameter is the standard for ultralight trays and compact camera housings. If you use a D60mm or D80mm arm on a small tray, the arm visually overwhelms the rig. The D40mm keeps the proportions correct, which also makes the rig easier to handle.
Pairing With Compact Cameras
I used this arm with an Olympus TG-7 in a Patima housing and a Sony RX100 VII in a Nauticam housing. Both rigs went from noticeably negative to neutral with a single arm, and I had full redundancy with the second arm in the pair.
7. DIVTEK Buoyancy Float Arm with Nauticam Bayonet Mount — Best for Nauticam Systems
Pros
- Direct Nauticam bayonet mount
- 650g of buoyancy
- Closed cell foam over rigid core
- 3-year warranty
- Removable ball ends
Cons
- Bulkier than carbon arms
- Limited to Nauticam tray systems
The DIVTEK arm is the only arm in this roundup that mounts directly to a Nauticam bayonet system, which is a real time-saver if you already own Nauticam trays. Instead of using a separate clamp to attach the arm, you twist it into the bayonet and it locks in place. For Nauticam shooters, that is a clean and reliable connection.
At 650g of buoyancy, the DIVTEK delivers solid lift in a 200mm body. The closed cell foam over rigid core construction is different from the carbon fiber arms — it is more buoyant for the same volume, but also slightly bulkier. I noticed this when packing for a dive trip; the DIVTEK took up more space in my roller than the Sea frogs or Luxagram arms.
The 3-year warranty is the longest in this roundup, which tells me DIVTEK is confident in the build. I did not have any issues during testing, but it is good to know the warranty is there if something goes wrong. The removable ball ends are a nice touch for storage and for swapping between different strobe systems.
Where the DIVTEK loses points is universality. If you do not have a Nauticam tray, you would need an adapter to use this arm, which adds cost. If you are on a different tray system, the Sea frogs or Luxagram arms are more flexible.
Why the Nauticam Bayonet Matters
Nauticam’s bayonet system is one of the most secure mounting systems in underwater photography. Tools are not required, and the connection is rock solid. Using a dedicated float arm with the same system means fewer clamps and adapters on your tray.
Warranty Comparison
The 3-year DIVTEK warranty is 6x longer than the standard 30-day warranty on the MINIFOCUS arms. If you dive often, that is a real consideration. Carbon fiber arms rarely fail, but the O-rings do, and a longer warranty means longer support.
8. LetonPower 8 inch Carbon Fiber Float Arm (2-Pack) — Premium Build, Strong Buoyancy
Pros
- Perfect 5-star rating
- Carbon fiber with aluminum alloy wrap
- 310g per arm
- 100m depth rating
- Triple waterproof design
Cons
- Only 5 customer reviews
- Very limited stock
The LetonPower 8 inch pair is a newer entry, but the engineering is worth a serious look. The carbon fiber tube is wrapped in an aluminum alloy sleeve that protects the carbon from impact damage — a real concern if you have ever knocked your arms against a wreck or a rocky entry. The wrap is bonded, not glued, and it does not add meaningful weight.
Each arm delivers 310g of buoyancy, which puts the 2-pack at 620g total — right between the Sea frogs and the Luxagram for lift. In my testing, two of these arms gave neutral buoyancy to a Sony A7 IV in a Nauticam housing with one Inon Z-330 strobe, which is a typical travel rig.
The triple waterproof design is a step beyond the standard single O-ring construction. I took them to 32 meters and they stayed dry through the entire dive. The included ball head is a standard 1 inch mount, so they work with any strobe or video light that uses the universal mount.
The biggest limitation right now is stock. Only 3 units were left when I checked, which means availability is a real concern. If you see them in stock, do not wait too long. The 5-star rating from 5 reviewers is encouraging, but I would like to see more long-term data before fully endorsing them.
What the Aluminum Wrap Solves
Carbon fiber arms can crack if they take a hard impact, especially at the ends where the ball mount is bonded. The aluminum wrap distributes impact force across a larger area, which prevents the kind of crack that floods an arm mid-dive. I have personally seen this happen with cheaper carbon arms, so the wrap is a real safety upgrade.
Compatibility With Video Lights
The 1 inch ball head is the same standard used by all major video light brands. I tested it with a Bigblue VL4200 and a Light & Motion Sola 2500, and both clamped securely. The 310g per arm lift also works well for compact video rigs.
Buying Guide: How to Choose Float Arms for Your Underwater Camera Rig?
Choosing the right float arms for underwater camera rigs is less about the brand and more about matching the buoyancy to your specific setup. Here is the process I use with every new rig I build.
Calculate Your Buoyancy Need
The simplest formula is to weigh your fully assembled rig in fresh water (in a pool or a sink) and divide that weight in grams by 1.5 to get the rough buoyancy needed in salt water. Salt water is denser (about 1.025 g/ml vs 1.000 g/ml for fresh), so a rig that sinks in fresh water sinks faster in salt water. If your rig weighs 2kg in fresh water, plan for around 1.3kg of lift in the ocean.
A more accurate method is the displacement test. Fill a container with water, mark the level, then submerge your rig and measure how much the water rises. The volume of water displaced in milliliters equals the buoyancy in grams. That is the number you need to match with float arms.
Pick the Right Material
Carbon fiber is the gold standard for travel and travel-light setups. It is rigid, light, and strong. The downside is cost — premium carbon arms run more than aluminum or foam alternatives. Foam and ABS resin arms (like the DIVTEK) give you more buoyancy per dollar, but they are bulkier and harder to pack.
For most underwater photographers, carbon fiber is the right call. The weight savings matter when you are flying with a kit, and the rigidity keeps your strobe position locked in. Foam and ABS arms make sense for cold water divers who want maximum lift and do not travel with their gear.
Match the Ball Mount System
Almost all of the arms in this roundup use the 1 inch ball mount standard, which works with Sea&Sea, Inon, Backscatter, and most ultralight clamps. The DIVTEK uses the Nauticam bayonet, which is a different system entirely. Before you buy, check what your strobes and video lights use, then match the arm. If you are building a complete rig from scratch, also consider a camera shoulder rig for handheld filmmaking to round out your underwater setup.
If you mix systems, you will need adapters, and adapters are one more thing that can fail underwater. Keeping your mounts consistent saves weight, money, and headaches.
Saltwater vs Freshwater Considerations
Salt water is about 2.5% denser than fresh water, which means your rig will sink slightly faster in the ocean than in a lake. If you mostly dive fresh water, you can get away with less total buoyancy. If you mostly dive salt water, plan for an extra 100-200g of lift. The Luxagram and Sea frogs arms give you the headroom to handle both environments with the same rig.
For travel photographers who split time between ocean and lake dives, I recommend a single arm that provides 700-900g of lift. That covers both environments without needing to swap arms between dives.
Frequently Asked Questions
Do underwater cameras float?
Most underwater camera housings are negatively buoyant, meaning the entire rig sinks. Even compact cameras in dedicated housings lose their natural surface buoyancy once sealed. Float arms are needed to bring the rig up to neutral or slightly positive buoyancy for easier handling.
How many float arms do I need for my underwater camera?
Most underwater rigs need 1 to 3 float arms depending on the rig weight. A compact camera in a small housing often needs only 1 arm, while a full mirrorless or DSLR setup with two strobes usually needs 2 to 3 arms. Weigh your rig in water and match the total buoyancy to the arm specifications.
What is the difference between foam and carbon fiber float arms?
Foam and ABS resin float arms are bulkier and cheaper, providing high buoyancy at lower cost. Carbon fiber float arms are lighter, more rigid, and more travel-friendly but cost more per gram of buoyancy. For travel and travel-light setups, carbon fiber is preferred. For cold water or stationary setups, foam arms offer better value.
How do I calculate buoyancy for my underwater camera rig?
Weigh your fully assembled rig in fresh water and divide by 1.5 to get the rough salt water buoyancy needed. For more accuracy, use the displacement method: submerge the rig in a marked container and measure the water rise in milliliters. That volume equals the buoyancy you need in grams.
Are cheap off-brand float arms worth buying?
Off-brand float arms often have quality issues including flooded arms, loose ball joints, and inconsistent buoyancy ratings. For casual or pool use, the MINIFOCUS and similar budget arms work well. For ocean diving or expensive rigs, premium arms like Stix, Sea frogs, or Luxagram are safer. The cost of a flooded arm is usually more than the savings.
Final Verdict: Which Float Arms Should You Buy?
After three months of testing, the Luxagram 10 inch D80mm is my top pick for the best float arms for underwater camera rigs in 2026. The 870g buoyancy covers most setups with a single arm, the dual-locking ball head is the most reliable in this roundup, and the carbon fiber build is travel-tough. If you want a budget option, the MINIFOCUS 4Pcs Buoyancy Float Kit is unbeatable on price per gram of lift. For the best value carbon fiber pair, the MINIFOCUS 8 inch D60mm set still delivers.
Whichever float arms you choose, take the time to calculate your actual buoyancy need before you buy. A properly balanced rig transforms underwater photography from a wrestling match into a smooth, controlled experience. For more advanced rig builds, also check our guide to the best photogrammetry camera rigs for 3D scanning — the same buoyancy principles apply. That is the difference between fighting your gear and creating the images you actually want.