INON UFL-G140 ZD Underwater Semi-fisheye Lens

Ultra Wide Coverage, Even Underwater

Standard action cameras lose their ultra-wide angle underwater due to the difference in refraction between air and water. For example, the GoPro® HERO13 Black offers a 156° angle of view on land, which reduces to 94° underwater when placed in a standard dive housing.
The INON UFL-G140 ZD restores and enhances this functionality, delivering an impressive 140° semi-fisheye view underwater—perfect for capturing expansive underwater scenes with just your action camera.

Measured angle of view by INON. Calculations are based on the HERO3+ Black Edition. Other models may yield different results.

Close Focus Wide Angle (CFWA) Imaging
Unlock dynamic underwater shots with the INON UFL-G140 ZD lens. It allows you to capture subjects at close range, creating dramatic deformations and perspective effects. The GoPro® HERO13 Black’s native depth of field (DoF) on land is approximately 60cm/2ft to infinity. With the UFL-G140 SD, the underwater DoF extends to an impressive 4cm/1.6in to infinity—ideal for stunning close-ups.

DoF figures are based on camera specifications and INON testing.

Professional-Grade Optics
The INON UFL-G140 ZD lens features a robust 4-element/4-group design with a high-refractive-index rear glass element to minimize size while maintaining performance. The front acrylic dome includes five-layer multi-coating for premium image quality comparable to optical glass domes—all at a budget-friendly price.

Use only with INON ZD Front Mask adapters. Non-INON adapters may degrade image quality and void the product warranty.

Product Specifications

Dimensions:

• Diameter: 93.4mm / 3.7in
• Length: 41.8mm / 1.6in (including Lens Hood)

Weight:

• Air: 300g / 10.6oz
• Underwater: Approx. 153g / 5.4oz (including Lens Hood)

Mount System:

• INON ZD Mount

Depth Rating:

• 60m / 196.9ft

Material and Finish:

• Body: Corrosion-resistant aluminum alloy with rigid black alumite coating, PC, etc.
• Lens: Optical glass with dual-side coating; optical plastic with hard coating and inner multi-coating.

Lens Construction:

• 4 groups, 4 elements

Maximum View Angle:

• 140.0° underwater (Varies by action camera model)

Depth of Field (DoF) with INON UFL-G140 ZD

DoF measured from the lens surface. For visual distance underwater, divide by 1.33.