iShoot Full Metal Tripod Mount Ring for Sigma 135mm f/1.8 - Stable

In this review of the iShoot Full Metal Tripod Mount Ring for the Sigma 135mm f/1.8 DG HSM Art lens, the bottom line is simple: this is a purpose-built collar that prioritizes rigid support and low weight for a heavy prime. Designed specifically for the Sigma 135mm f/1.8, it offers a precise fit, quick release convenience and a durable all-metal build. For photographers who regularly use this lens on a tripod or gimbal and need consistent balance without adding bulk, this mount ring is a practical and reliable accessory.

Key Features

• Aviation aluminum construction: The CNC-machined alloy shell keeps the collar lightweight yet rigid for stable lens support.
• Custom fit: Positioning by the lens switch and bayonet prevents rotation and ensures the ring aligns exactly with the lens for secure mounting.
• Protective interior: The inside is lined with 3M plastic film to prevent wear on the lens finish during use.
• Integrated quick release plate: The about 70mm AS-standard plate at the bottom provides fast attachment to Arca-style heads and has 1/4 and 3/8 screw holes.
• Weight-saving design: Hollow-out machining and rounded corners reduce bulk while maintaining strength; net weight is about 175g.
• Corrosion-resistant hardware: Stainless steel screws and an anodized finish add durability in field use.

Who It's For

This mount ring is aimed at landscape, portrait and event photographers who use the Sigma 135mm f/1.8 on a tripod or ball head and need an exact-fit collar to improve balance and reduce lens stress. The quick release plate makes it useful for shooters who move frequently between tripod and handheld rigs and want a repeatable mounting position.

It is less relevant for photographers who rarely place this lens on a tripod, or for those who need a multi-lens adjustable collar; this product is customized to the Sigma 135mm f/1.8 and is not intended as a universal solution.

Pros & Cons

Pros

• Solid, CNC-machined aviation aluminum body gives a stable, professional feel.
• Custom positioning by switch and bayonet prevents rotation and ensures a precise fit.
• AS-standard quick release plate speeds tripod changes and is compatible with many Arca-style heads.
• Lightweight design at about 175g makes it easy to carry without upsetting balance.

Cons

• As a lens-specific collar it cannot be rotated and is not a universal clamp for other lenses.
• Limited to the supplied plate format, so some specialized tripod plates or clamps may require adapters.

Specifications

Material	Aviation aluminum, stainless steel screw
Inner diameter	About 83mm
Width	About 25mm
Quick release plate length	About 70mm (AS standard)
Compatibility	Sigma 135mm f/1.8 DG HSM Art; Arca-Swiss fit heads
Net weight	About 175g

Our Verdict

The iShoot Full Metal Tripod Mount Ring is a focused, well-made accessory for photographers who rely on the Sigma 135mm f/1.8 and want improved tripod balance with quick-release convenience. Its CNC aluminum build, protective 3M lining and Arca-compatible plate make it good value for users who need a secure, lightweight collar tailored to this lens.

Frequently Asked Questions

Will this fit other lenses?
It is customized for the Sigma 135mm f/1.8 and is not intended as a universal collar; fit and alignment are specific to that lens.

Is the quick release plate Arca-compatible?
Yes, the bottom plate is AS standard and works with most Arca-style tripod heads and clamps.

Will the ring damage my lens finish?
No, the interior is covered with a 3M plastic film and corners are rounded to reduce wear on the lens body.