Front Cine Ring for Contax Zeiss 18mm Lens

https://www.bhphotovideo.com/c/search?q=simmod%20contax%20ring&sts=ma

Contax Zeiss 18mm f/4 · 80mm Outer Diameter

Purpose-built with intent, this Signature Series Front Cine Ring is engineered exclusively for the

Contax Zeiss 18mm f/4. This is not a universal solution or a threaded compromise. It is a dedicated mechanical interface designed around a lens that was never meant to support modern cine workflows.

Solving a Lens That Was Never Meant to Adapt

The Contax Zeiss 18mm f/4 is a unique optic with no native front filter threads. That limitation has historically made it difficult to integrate into professional setups.

This ring changes that.

It converts the front of the lens into a true 80mm cine-standard outer diameter while introducing a 77mm internal filter thread, allowing the use of screw-in filters, matte boxes, and front-mounted accessories.

Precision Machined Construction

Each ring is CNC machined from solid aluminum, delivering a rigid, lightweight structure that holds up in production environments. The exterior features a precision-cut knurled surface, providing confident grip when handling the lens or mounting accessories.

This is functional machining, not cosmetic. Every surface is designed for control, alignment, and repeatability.

Set-Screw Mounting System

Because the Contax Zeiss 18mm lacks front threads, this ring uses a different approach:

• The ring mounts directly onto the lens barrel using three precision set screws
• It locks securely in place without modifying the lens
• Installation is straightforward with the included hardware and tool

This system creates a centered, stable interface that remains fixed under real shooting conditions.

Why It Matters

Ultra-wide lenses like the 18mm are often the hardest to integrate into cine setups due to their unconventional front designs.

With this dedicated cine ring:

• The lens becomes part of a standardized front system
• Matte box alignment remains consistent
• Filters can now be used where none were possible before
• Setup becomes faster, cleaner, and more predictable

The Simmod Approach

Simmod does not believe in forcing compatibility through compromise.

By designing this ring specifically for the Contax Zeiss 18mm f/4, the result is a component that feels native to the lens. It respects the original design while extending its usability into a modern production environment.