iShoot 82mm Lens Collar Tripod Mount Ring - Arca Fit Quick Release

In this review of the iShoot 82mm Lens Collar Tripod Mount Ring, the bottom line is simple: it is a purpose-built, lightweight tripod ring for photographers using the Sigma 105mm F1.4 Art or Sigma 100-400mm f/5-6.3 DG DN OS lenses who need a solid Arca-compatible support without excess bulk. The reviewer found the ring's CNC aluminum build, Arca-Swiss dovetail and reserved screw holes make it a practical upgrade for studio and field work, while its tailored fit and protective inner film prevent abrasion on the lens barrel.

Key Features

• Tailored compatibility: Designed to match the Sigma TS-111 form and fit the Sigma 105mm F1.4 DG HSM Art and Sigma 100-400mm DG DN OS precisely, which keeps the lens stable on a tripod.
• Lightweight construction: The hollowed aviation aluminum body weighs about 170g, offering strong support without adding significant weight to a rig.
• Arca-Swiss quick release: A 65mm long Arca-fit dovetail plate lets the collar mount directly to Arca-compatible heads and clamps for fast, secure attachment.
• Lens protection details: Inner grooves, notches and a 3M protective plastic film help prevent the collar from scratching the lens finish during use.
• Mounting versatility: Bottom 1/4in and 3/8in screw holes with stainless anti-slip screws allow fixed tripod mounting when needed for heavy-duty stability.
• Secure locking: A non-slip locking knob gives tactile control when clamping the collar to the lens for repeatable positioning.

Who It's For

The iShoot collar is aimed at photographers who already own the specific Sigma lenses listed and want an Arca-compatible support that is lighter and more refined than many generic rings. It is especially useful for portrait, wildlife and sports shooters who change between handheld and tripod setups frequently and need a quick-release dovetail on the lens itself.

Photographers with other lens models or owners of the Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary (EF / F Mount) should look elsewhere, because this collar is not compatible with that Contemporary EF/F mount variant or with lenses outside the specified models.

Pros & Cons

Pros

• Tailored fit for Sigma 105mm F1.4 Art and Sigma 100-400mm DG DN OS provides stable, centered support.
• Built from CNC-machined aviation aluminum for a refined finish and strong but light construction.
• Built-in 65mm Arca-style dovetail plate speeds tripod mounting and works with standard Arca clamps and heads.
• Protective inner film and anti-slip design help safeguard the lens finish and keep the collar locked.

Cons

• Compatibility is limited to specific Sigma lens models, so it will not fit other lenses or the Contemporary EF/F-mount 100-400mm variant.
• Width and feature set are fixed, so photographers needing an adjustable or multifunction support may prefer a different style.

Specifications

Inner diameter	About 82mm
Net weight	About 170g
Plate length	65mm Arca-fit dovetail
Material	Aviation aluminum, CNC machined
Mounting holes	Reserved 1/4in and 3/8in screw holes with stainless steel screws
Compatible lenses	Sigma 105mm F1.4 DG HSM Art and Sigma 100-400mm f/5-6.3 DG DN OS (E/L mounts)

Our Verdict

The iShoot 82mm tripod collar is a focused accessory that delivers refined build quality, Arca-compatible convenience and lens protection for the two supported Sigma lenses. It represents good value for photographers who need a lightweight, durable dovetail ring tailored to those optics, but it is not a universal solution for other lens models.

Frequently Asked Questions

Will this fit the Sigma 100-400mm EF mount Contemporary?
It will not fit the Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary EF/F mount variant; compatibility is limited to the listed E and L mount DN OS and the 105mm Art models.

Can I use it with an Arca-Swiss clamp?
Yes, the collar includes a 65mm Arca-fit dovetail plate that mounts directly to standard Arca-Swiss style clamps and heads.

Does it protect the lens finish?
The inner wall includes grooves, notches and a 3M protective plastic film to reduce the risk of scratching the lens barrel.