40mm extension ring with MARELUX locking mechanism
40mm extension ring with MARELUX locking mechanism
MARELUX

40mm extension ring with MARELUX locking mechanism

€309.00
Tax included
Price excluding tax / DOM-TOM €257.50
MARE32004

MARELUX 40mm extension ring with locking mechanism

  • Anodised aluminium construction offering optimum resistance to corrosion and pressure.
    • 40 mm length allowing precise adjustment of the porthole’s position to suit the lens being used.
    • Integrated locking system ensuring a secure fit and preventing accidental loosening whilst submerged.
    • Double O-ring for enhanced watertightness and increased security for your optical assembly.
    • Fully compatible with the Marelux port system and adaptable to other standards via conversion rings.

In stock at the supplier – delivery time 10 to 15 days
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40mm extension ring with MARELUX locking mechanism

MARELUX 40mm extension ring with locking mechanism

This 40 mm extension ring is an essential component for optimising your housing’s optical setup. It allows you to position the porthole or dome at the exact distance required by the length of your lens, thereby ensuring perfect image quality without vignetting. Its robust anodised aluminium construction ensures maximum durability, even with intensive use in a saltwater environment.

Technical specifications MARELUX 40mm extension ring with locking mechanism

  • Material: High-quality anodised aluminium.
    • Extension length: 40 mm.
    • Safety system: Mechanical latch lock to prevent rotation.
    • Sealing: Double O-ring system.
    • Colour: Black.
    • Compatibility: Viewports and domes from the Marelux range.
    • Installation: Quick assembly and disassembly without the need for special tools.

Diveavenue's expert opinion MARELUX 40mm extension ring with locking mechanism

We tested this ring in a number of setups, and what really makes the difference is the locking latch. Unlike standard rings, which can sometimes become loose due to vibrations or handling, this one remains firmly attached to the housing. It’s an essential accessory for anyone using zoom lenses or prime lenses that require precise clearance to avoid hitting the dome.

Frequently Asked Questions (FAQ)

Why choose a 40 mm extension rather than another size ? The choice of length depends entirely on your lens. A 40 mm ring is often required for medium-length lenses in order to position the front element at the dome’s optimal nodal point.

Is the locking system easy to use ? Absolutely. The mechanism operates smoothly and allows the extension to be secured with a single movement. This provides significant added security, preventing water from entering due to accidental mishandling.

Should I lubricate the ring seals regularly ? It is recommended that you apply a thin layer of silicone grease to both seals before each installation to ensure smooth insertion and guarantee a perfect seal.

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