iShoot Tripod Mount Ring for Sigma 150-600mm Contemporary - Arca Plate

In this review the iShoot Tripod Mount Ring is assessed for photographers who use the Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary lens and need a robust tripod collar with quick release compatibility. The bottom line: this CNC machined collar is a purpose-built, lighter alternative to the original, with an integrated 75mm Arca fit quick release plate and protective 3M film that prevents scratching while giving a reliable mounting platform. It is best for users wanting an Arca-compatible interface and a precise aluminum build rather than a generic, one-size-fits-many collar.

Key Features

• Exact compatibility: Custom fit for the Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary lens, ensuring a snug, alignment-correct mount.
• Arca-Swiss quick release: The integrated 75mm Arca fit plate allows direct clamping to Arca-style tripod heads and panoramic heads without an added plate.
• Scratch protection: A 3M film lining on the interior prevents abrasive contact with the lens barrel during installation and removal.
• Sturdy attachment: Bottom support includes both 1/4 in and 3/8 in screw holes plus stainless steel anti-slip screws for secure tripod fixing.
• CNC aluminium construction: Made from aviation aluminum with hollowed weight-reduction machining and anodized finish for a strong but lightweight collar.

Who It's For

This collar is for wildlife, sports, and birding photographers who own the Sigma 150-600mm Contemporary lens and already use Arca-style heads or clamps; the built-in QR plate eliminates the need for an extra lens plate and speeds setup in the field. Its CNC build and 3M padding are suited to users who want a durable, precise collar that avoids marring the lens finish.

It is not for owners of the Sigma 150-600mm Sports version, since the collar is explicitly incompatible, nor for photographers who need a universal collar that fits multiple lenses. Those who require a collar with integrated rotation locks beyond the standard design should look elsewhere.

Pros & Cons

Pros

• Tailor-made fit for the Contemporary lens provides precise alignment and stable balance on a tripod.
• Integrated 75mm Arca fit plate simplifies mounting on Arca-style ball heads and clamps.
• Lightweight CNC-machined aviation aluminum keeps added weight down while remaining durable.
• Interior 3M film protects the lens finish from scratches during use.

Cons

• Compatibility limited to the Contemporary Sigma 150-600mm only, so it is not a universal solution.
• No mention of additional rotation detents or advanced locking features beyond the standard collar design.

Specifications

Compatibility	Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary
Material	Aviation aluminum, CNC machined
Quick release plate	Arca fit, approx. 75mm length
Screw holes	1/4 in and 3/8 in with stainless steel anti-slip screws
Interior protection	3M film lining to prevent scratches
Net weight	About 170g

Our Verdict

The iShoot Tripod Mount Ring is a practical, well-made collar for owners of the Sigma 150-600mm Contemporary lens who want built-in Arca compatibility and a protective, lightweight design. Its CNC aluminum construction and integrated QR plate make it a good value for photographers seeking a precise, field-ready mounting solution, provided they understand the compatibility restriction to the Contemporary model.

Frequently Asked Questions

Will this collar fit the Sigma 150-600mm Sports version?
No. This collar is designed only for the Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary lens and is not compatible with the Sports version.

Can I mount this directly to my tripod head?
Yes. The bottom includes a 75mm Arca fit quick release plate and 1/4 in and 3/8 in screw holes so it mounts directly to Arca-style ball heads and tripod plates.

Does it protect the lens finish?
Yes. The interior has a 3M film lining to reduce the risk of scratches against the lens barrel.