This ARRI R2 138mm Filter Ring fits into the back of ARRI matte boxes with a rear opening of 143mm, and is for internal focus lenses only. It enables mounting a 138mm round filter, such as a polarizer, onto your matte box and allowing for rotation of the filter. The R2 ring acts as an anti-refection donut and supports lenses with a front outer diameter of 114mm such as Master Primes, Ultra Prime, and LDS Ultra Primes.

The ring will allow you to use wide-angle video lenses as well, but only lenses with an internal focus design. It will accept optional R4 reduction rings, which allow you to use select lenses with a front outer diameter of less than 114mm.

Supports 138mm Filters    For Matte Boxes with 143mm Openings    Compatible with MMB-1 Matte Box    For Lenses with 114mm Outer Diameter    For Lenses with Internal Focus Only    For Master Prime Lenses    For Ultra Primes from 14 to 180mm    For LDS Ultra Primes from 14 to 180mm    Accepts Reduction Ring R4

For matte boxes with rear 143mm opening. Compatible with the MMB-1 top-loading matte box

Anti-reflection donut accepts 138mm round filters

This R2 ring works with internal focus lenses only, as it does not accommodate the expansion and contraction of external focus lenses

For lenses with a 114mm front outer diameter

Accepts R4 reduction rings for working with lenses that have a smaller front outer diameter than 114mm

Related Questions and Answers

Q: 1. Is this compatible with the Zeiss CP3 Lenses?

A: The Zeiss CP.3 Cine Lens set have a front diameter of 95mm. it Bright Tangerine does have a 114mm-95mm adapter ring you can use for compatibility: https://bhpho.to/2jZb4l7

Q: 2. Is there a set of Diopters that fits into this clamp on system?

A: This is an adapter ring that uses 4.53 /115mm filters such as the Schneider 68-040615 0.6 Neutral Density Filter.

Q: 3. Does it fit voigtlander 35mm F/2 ultron type 1?

A: Looking online the focus ring for that lens appears to be very small. You should be able to glue the 7artisans Photoelectric Lens Focus Ring Tab on it, but it maybe a little bigger than the focus ring is. Should still work if you don't mind that.

Q: 4. Will this work also to mount the Atlas Tilta lightweight clamp for 114mm and adapt it to 95mm?

A: Yes, if your lens has a 95mm diameter the Vaxis VFX Filter Adapter Ring (95-114mm) would bring it up to 114mm so it could work with the Atlas Lens Co. Atlas X Tilta Lightweight Diopter Clamp model BH #ATAXTLDC.

Q: 5. helloi wanna ask if the diopter stage can fit the close up filter +2?

A: yes but you can not slide in, you will have to open mattebox to pop diopter in.

Q: 6. Will this fit the Arri MMB-2 matte box?

A: The 114mm outside ring would fit into the MMB-2 which is also 114mm and then allow you to use an 80mm outside lens.

Q: 7. Will this allow me to use a lens with a rotating front to my matte box?

A: As long as the thread size matches the inside diameter of the Bright Tangerine Threaded Adapter Ring for Bright Tangerine 143 to 114 Rubber Donut, you should be fine.

Q: 8. Hi, what mattebox size is this diopter frame for? It says 5,4 Inch, but the common mattebox sizes are 4x5.65 or 6.6x6.6 . Hoping it fits an Arri LMB 5 or 25 which is 4x5.65 .

A: The frame has the width of two 4 x 5.65'' filter frames. You will need at least a 2 stage matte box to use this frame.

Q: 9. Are these compatible with the Arri SXU-1 (Single Axis Unit)?

A: Yes it is. This can be used with B&H # ARSXU1 as well.

Q: 10. Will this fit TTArtisan's 25mm f/2 lens?

A: Yes, the 7artisans Photoelectric Lens Focus Ring Tab (Black) can fit onto the TT Artisan 25mm f/2.