FAQ
The most common lens front diameters, in order of prevalence, are:
✔ 114mm
✔ 95mm
✔ 110mm
✔ 80mm
✔ 104mm
✔ 87mm
Well-known brands that use these lens front diameters include ARRI, Zeiss, Cooke, Second Reef, Angénieux, Zero Optik, TLS, Leica, Fujinon, Kowa, DZOFilm, Masterbuilt, Atlas, Sigma, Hawk, LOMO, Canon, P+S Technik, Camtec, XELMUS, and TRIBE7.
The Standard Kit includes three different Bun-G-Rings (BGR-95, BGR-110, and BGR-114), making it compatible with 1,000+ cinema lenses, including models from ARRI, Zeiss, Cooke, and Angénieux.
This kit is ideal for camera assistants and rental houses, covering multiple lens front diameters in one package.
The Triple Kit is a set of three Bun-G-Rings of the same size. This kit is ideal for lens owners who use a specific front diameter.
With three BGRs, you can pre-mount multiple filters and swap them instantly. Each filter stays protected in its dedicated sleeve, allowing you to mount it in seconds without tape or hassle.
The Light Stopping Insert (LSI) is designed to prevent unwanted light from entering the space between the lens and the filter when using the BGR-110 and BGR-114.
Since the LSI is not always necessary, it is magnetically attached to the Bun-G-Ring for easy removal when not in use.
There are two versions of the LSI:
✔ LSI 4x4 – for 4x4 filters
✔ LSI 4x5.65 – for 4x5.65 filters
Yes! The Bun-G-Ring supports all rectangular and square filters, including: ✔ 4x5.65" ✔ 4x4" ✔ 6.6x6.6"
You can also stack up to 5 filters of the same size, providing maximum creative flexibility.
The Bun-G-Ring is crafted from glass fiber-reinforced polyamide and stainless steel, making it extremely strong yet lightweight.
The bungee cords are reinforced with Dyneema®, a material used in aerospace and extreme sports for its unparalleled strength and durability.
Full list of Technical Specifications here.
The Bun-G-Ring is lighter, faster, and more flexible than a traditional matte box. It’s perfect when:
✔ A matte box is too large or impractical for the setup.
✔ Weight is an issue (e.g., when using a gimbal, drone, or Steadicam).
✔ You need to swap filters quickly without reconfiguring your rig.
The bungee cords are designed for intensive professional use. While lifespan depends on usage, Dyneema® reinforcement makes them significantly more durable than standard elastic cords.
Our bungee cords are threaded with Dyneema®, an ultra-strong material that is practically unbreakable.
In the rare event that a cord comes loose or breaks, the design ensures that the filter remains secured by the remaining cord—preventing it from falling immediately. However, we recommend reattaching or replacing the loose cord as soon as possible.
The Bun-G-Ring and Dyneema® bungee cords are resistant to extreme temperatures, humidity, and dust, making them ideal for challenging shooting environments.
Component
Bun-G-Ring (body)
Tightening screw
Tightening screw washer
Tightening screw tube
Bungee cord
Cord end
Grip seal
Torx screws (M2.5)
Step Down Ring (BGR)
Light Stopping Insert (LSI)
LSI magnets
Material
Glass fiber-reinforced polyamide (matte surface finish)
Stainless steel (black coated)
Stainless steel
Carbon fiber
Dyneema® enforced polypropylene
Stainless steel (black coated)
Silicone
Silicone
Glass fiber-reinforced polyamide (matte surface finish)
Glass fiber-reinforced polyamide (matte surface finish)
Neodymium (black epoxy finish)
Product
BGR-95
SDR-95-80
SDR-95-87
BGR-110
SDR-110-104
LSI-110 (4x4)
LSI-110 (4x5.65)
BGR-114
LSI-114 (4x4)
LSI-114 (4x5.65)
Product
Weight
61.7 g / 2.17 oz
13.8 g / 0.48 oz
23.5 g / 0.82 oz
65.7 g / 2.31 oz
5.1 g / 0.18 oz
3.9 g / 0.13 oz
13.8 g / 0.48 oz
5.1 g / 0.18 oz
65.8 g / 2.32 oz
7.6 g / 0.26 oz
Material Specifications
Component
Cord end
LSI magnets
Tightening screw tube
Grip seal
Tightening screw
Bun-G-Ring (body)
Step Down Ring (BGR)
Bungee cord
Light Stopping Insert (LSI)
Tightening screw washer
Torx screws (M2.5)
Material
Stainless steel (black coated)
Carbon fiber
Glass fiber-reinforced polyamide (matte surface finish)
Stainless steel
Silicone
Stainless steel (black coated)
Glass fiber-reinforced polyamide (matte surface finish)
Neodymium (black epoxy finish)
Silicone
Dyneema® enforced polypropylene
Glass fiber-reinforced polyamide (matte surface finish)
Material Specifications
Component
Bun-G-Ring (body)
Tightening screw
Tightening screw washer
Tightening screw tube
Bungee cord
Cord end
Grip seal
Torx screws (M2.5)
Step Down Ring (BGR)
Light Stopping Insert (LSI)
LSI magnets
Material
Glass fiber-reinforced polyamide (matte surface finish)
Stainless steel (black coated)
Stainless steel
Carbon fiber
Silicone
Dyneema® enforced polypropylene
Silicone
Stainless steel (black coated)
Glass fiber-reinforced polyamide (matte surface finish)
Glass fiber-reinforced polyamide (matte surface finish)
Neodymium (black epoxy finish)
Component
Tightening screw washer
Cord end
Step Down Ring (BGR)
Bun-G-Ring (body)
Torx screws (M2.5)
Bungee cord
LSI magnets
Light Stopping Insert (LSI)
Tightening screw
Tightening screw tube
Grip seal
Material
Carbon fiber
Stainless steel (black coated)
Stainless steel
Glass fiber-reinforced polyamide (matte surface finish)
Silicone
Silicone
Glass fiber-reinforced polyamide (matte surface finish)
Glass fiber-reinforced polyamide (matte surface finish)
Stainless steel (black coated)
Neodymium (black epoxy finish)
Dyneema® enforced polypropylene
