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Product Information
The AOI FC-01 Float Collar is a buoyancy accessory built for the AOI UWL-09 and UWL-09 Pro wide angle wet lenses, made of polystyrene, weighing 130 grams on land, and designed to shift total underwater weight to -60 grams (positive buoyancy) with the UWL-09 or +270 grams (negative buoyancy) with the UWL-09 Pro.
Who it is for
This float collar is for underwater photographers who use the AOI UWL-09 or UWL-09 Pro wide angle conversion lens and want to adjust how that lens behaves underwater. Attaching the FC-01 changes the total underwater weight of the lens setup, which affects whether the lens rig floats or sinks when detached.
Key details
- Material: Polystyrene
- Dimension: 170mm (D) x 55mm (H)
- Weight: 130 grams on land
- With UWL-09: -60 grams total underwater weight (positive buoyancy)
- With UWL-09 Pro: +270 grams total underwater weight (negative buoyancy)
- Accessory included: Secure lanyard
Compatibility and sizing
The FC-01 is built specifically for the AOI UWL-09 wide angle conversion lens and the AOI UWL-09 Pro wide angle conversion lens. It is not described as compatible with other lenses.
What's in the box
- FC-01 Float Collar
- Secure Lanyard
DiveCatalog.com is an authorized AOI dealer and a dive shop in Irvine, California, serving divers since 2003. Call or chat with us at 888-701-4017 if you have questions about fit or compatibility with your UWL-09 or UWL-09 Pro lens.
- Buoyancy adjustment: Float collar adds buoyancy to compensate for the weight of the attached wide angle wet lens.
- Lens fitment: Fits the AOI UWL-09 and AOI UWL-09 Pro wide angle conversion lenses.
- Material: Made of polystyrene.
- Dimensions: Measures 170mm (D) x 55mm (H).
- On-land weight: Weighs 130 grams on land.
- UWL-09 result: Brings total underwater weight with the UWL-09 to -60 grams, which is positive buoyancy.
- UWL-09 Pro result: Brings total underwater weight with the UWL-09 Pro to +270 grams, which is negative buoyancy.
- Included lanyard: Comes with a secure lanyard accessory.
| Brand | AOI |
| Model | FC-01 Float Collar |
| MPN | 4049 |
| Material | Polystyrene |
| Dimension | 170mm (D) x 55mm (H) |
| Weight | 130 grams (on land) |
| Total Underwater Weight with UWL-09 | -60 grams (Positive Buoyancy) |
| Total Underwater Weight with UWL-09 Pro | +270 grams (Negative Buoyancy) |
| Included Accessory | Secure Lanyard |
| Compatibility | AOI UWL-09, AOI UWL-09 Pro |
- FC-01 Float Collar
- Secure Lanyard
⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
Frequently Asked Questions
Does the AOI FC-01 float collar make a lens positively or negatively buoyant underwater?
It depends on which lens it is attached to. With the AOI UWL-09, the total underwater weight becomes -60 grams, which is positive buoyancy. With the AOI UWL-09 Pro, the total underwater weight becomes +270 grams, which is negative buoyancy.
Is the AOI FC-01 float collar compatible with lenses other than the UWL-09 and UWL-09 Pro?
No. The manufacturer specifies compatibility only with the AOI UWL-09 wide angle conversion lens and the AOI UWL-09 Pro wide angle conversion lens. It is not published as compatible with other wet lenses.
What is included when you buy the AOI FC-01 float collar?
The package includes the FC-01 Float Collar itself and a secure lanyard accessory. No other items are listed as included by the manufacturer.
What material is the AOI FC-01 float collar made of?
The FC-01 is made of polystyrene. Its dimension is 170mm (D) x 55mm (H) and it weighs 130 grams on land.












