Crosziel and Arri step-down rings cross-compatible?

[Andreas Mendritzki]

Hi

I'm wondering if anyone knows off-hand if crosziel and arri matte-box step down rings (screw-in kind) are cross-compatible?

Basically I'm looking for some rings for our beautiful new Kowa Prominar Anamorphics, which have small 75mm fronts. Arri doesn't seem to make rings that small, but Crosziel does (so I want to use crosziel rings with our Arri matte-boxes).

thanks

 

[Ernesto Lomeli]

Seems like you just need a custom step down ring machined out of delrin.
Since your in Canada you might ask your closest
Rental house with a machine shop if the can make you
An 80-75mm step down that you can place in studio matte boxes
But then can used with clip on matte boxes also.

But if I remember some of those kowas rotate in the front.

Either way it's a very simple an common problem.

If you cannot locate one, I know Paul Duclos machines
Those delrin step downs. They have made them in the past for us.

 

[Matt Ryan]

I don't know if it's the same for all matte boxes but the new Bright Tangerine matte box line is compatible with any industry standard step down ring from any manufacturer (Arri, Chrosziel, etc.). So I'd assume they are all the same. A 110mm ring on one is the same as the other brands, as is the thread size. So they should be fine.

 

[Andreas Mendritzki]

I don't know if it's the same for all matte boxes but the new Bright Tangerine matte box line is compatible with any industry standard step down ring from any manufacturer (Arri, Chrosziel, etc.). So I'd assume they are all the same. A 110mm ring on one is the same as the other brands, as is the thread size. So they should be fine.

Yeah, I'm thinking its not going to be an issue. . . I'll probably order today. I'll post when I have a definitive answer.

 

[Greg M]

They are not the same thread, but they will partially fit if you don't force it.

 

[Andreas Mendritzki]

Thanks Greg

Anyone know of an arri compatible 75mm ring?

I'll check with Duclos as Ernesto mentioned. He's certainly made (or sourced) step-UP rings for our lenses, but ideally I don't want to go that route. (BTW Ernesto, the Kowa's dont' rotate or telescope fortunately)

 

[Andreas Mendritzki]

Just an update, The chrosziel threaded ring seemed to work without issue with the arri back.