Nanlite Adjustable Iris Diaphragm for FM-Mount Projection Attachments

Overview

The Nanlite PJ-FMM-AI Adjustable Iris Diaphragm is a precision beam-control accessory designed for use with the Nanlite FM-mount projection system, including the PJ-FMM 19° and 36° projection attachments.

This iris insert features an 18-blade diaphragm design, allowing users to continuously adjust the diameter of the projected light beam without changing lenses or repositioning the fixture. The result is precise control over beam size, shape, and intensity falloff, making it ideal for cinematic lighting setups where subtle adjustments are critical.

When installed into a compatible projection attachment, the iris enables the creation of tight, focused spotlight beams or wider circular projections, depending on the desired lighting effect. This makes it especially useful for theatrical lighting, product highlighting, subject isolation, and controlled accent lighting.

The PJ-FMM-AI works in conjunction with the projection system’s focus and lens optics, allowing lighting designers to fine-tune both sharpness and beam diameter simultaneously for maximum creative control.

Built from durable heat-resistant materials, it is designed for continuous professional use in demanding production environments.

Unlike gobos (which create patterns), the iris is used purely for beam shaping and size control, forming a key part of the Nanlite projection ecosystem alongside lenses, shutters, and gobo systems.

Key Features
• Adjustable iris diaphragm for Nanlite FM-mount projection system
• Compatible with PJ-FMM 19° and 36° projection attachments
• 18-blade design for smooth, circular beam shaping
• Continuously variable beam diameter control
• Enables tight spot to wide circular projection adjustment
• Drop-in installation via projection attachment slot system
• Works with focus system for combined beam sharpness control
• Ideal for cinematic, theatrical, and studio lighting setups
• Heat-resistant construction for professional use
• Essential accessory for advanced beam shaping workflows

Specifications
• Product Type: Iris diaphragm insert
• Brand: Nanlite
• Model: PJ-FMM-AI
• Blade Count: 18 blades
• Mount System: FM-mount projection system
• Function: Adjustable beam diameter control
• Operation: Manual lever adjustment system
• Material: Heat-resistant metal construction
• Application: Film, broadcast, photography, studio lighting

Compatibility
• Nanlite PJ-FMM 19° Projection Attachment
• Nanlite PJ-FMM 36° Projection Attachment

What’s in the Box
• 1 × Nanlite PJ-FMM-AI Adjustable Iris Diaphragm

Why we stock it

Hand-picked for its build quality, service backup, and on-set reliability. Talk to our team for kit-list recommendations.

Technical specifications

Detailed specifications available on request.

Need help speccing this?

Our team has rigged, gaffed, and shot with this fixture. Tell us about the production and we'll talk through the modifier set and accessory list.

Local support, in-house workshop

Every fixture we sell is backed by a 24-month warranty, fully serviced from our Johannesburg workshop. We stock genuine spares and can usually return a unit to service within 5 working days of intake.

Our technical team has run the original manufacturer training courses in South Africa — if you need help configuring DMX, integrating with a CRMX system, or troubleshooting on location, we're a phone call away.

Need it on a job tomorrow?

We hold flagship cinema fixtures in walk-in stock. Order before 11:00 for same-day Johannesburg dispatch — or come collect from our showroom in person.