65mm??????? Why cant I find Step Rings?

[Patrick Clement]

So , I know the answer to my question already...no one makes 65mm step rings.

 

But, why does NO ONE make them?

 

I want a 65mm to 77mm step up ring for a lens attachment to my Som Berthiot 70 lens for my bolex.

 

Answers?

Solutions?

 

....appreciated.

[Ira Ratner]

Here's something that brings you from 65 to 72 for conventional round filter thread:

 

http://www.bhphotovideo.com/c/product/3106...mp_On_Step.html

 

So now you just have to find a 72 to 77, which I'm sure is easy to find but I'm too lazy to find it myself right now and I want to have dinner.

 

But what kind of attachment are you talking about?

Edited December 5, 2008 by Ira Ratner

[Patrick Clement]

Here's something that brings you from 65 to 72 for conventional round filter thread:

 

http://www.bhphotovideo.com/c/product/3106...mp_On_Step.html

 

So now you just have to find a 72 to 77, which I'm sure is easy to find but I'm too lazy to find it myself right now and I want to have dinner.

 

But what kind of attachment are you talking about?

Thanks for the tip.

The problem is that that clamp is for a 65mm exterior diameter.

I am trying to adapt a Pan Cinor 70 (Som Berthiot) on my bolex. (see picture below)

 

The lens is a 65mm and the exterior diameter is about 70mm.

 

I would like to adapt either this Cokin Type Filter (more for mattes and vingetting)

http://cgi.ebay.com/Filter-Holder-Adapter-...93%3A1|294%3A50

 

or this filter system:

http://cgi.ebay.com/Filter-Holder-Adapter-...93%3A1|294%3A50

 

------------------------------------------------------------------------------------------

I've dug long and deep for something that would work and I'm at a loss.

The other issue being that the focus is controlled at the end of the lens, so anything that would be adapted would rotate as I focus. So weight and bulk can and will be an issue.

[Guest Glenn Brady]

You might try http://www.srb-griturn.com/. They're cheaper than S. K. Grimes in my experience.

[Ira Ratner]

I am totally missing something here:

 

The first link you posted is just the Cokin system, which I use. Why do you need a 65 to 77 step-up ring?

 

Where does the 77 size come in?

[Patrick Clement]

I am totally missing something here:

 

The first link you posted is just the Cokin system, which I use. Why do you need a 65 to 77 step-up ring?

 

Where does the 77 size come in?

 

This is the actual filter holder I would like:

http://cgi.ebay.com/Mamiya-Gel-Gelatin-Fil...p3286.m20.l1116

 

77mm thread size.

 

Although I would be happy with ANY 65mm step up.... I cant find 65mm anything?!?!?

Edited December 6, 2008 by Patrick Clement

[Ira Ratner]

This is the actual filter holder I would like:

http://cgi.ebay.com/Mamiya-Gel-Gelatin-Fil...p3286.m20.l1116

 

77mm thread size.

 

Although I would be happy with ANY 65mm step up.... I cant find 65mm anything?!?!?

 

I really give up here, because I'm understanding nothing the way you're explaining it:

 

You can get a 65mm ring for the Cokin holder, or a 77, which takes the Cokin square/rectangular filters.

 

So once again--what is the end game here with 77mm? I asked you before but can't seem to get an answer on this.

 

What the f*** does the 77mm size have to do with any of this?

[Patrick Clement]

I really give up here, because I'm understanding nothing the way you're explaining it:

 

You can get a 65mm ring for the Cokin holder, or a 77, which takes the Cokin square/rectangular filters.

 

So once again--what is the end game here with 77mm? I asked you before but can't seem to get an answer on this.

 

What the f*** does the 77mm size have to do with any of this?

 

What is there not to understand? I need a 65mm step ring.

 

It's obvious you cant help...so don't. Cokin DOES NOT sell a 65mm step ring.

[Ira Ratner]

NOW I get it:

 

You want to use that gel holder, which is 77mm.

[Patrick Clement]

My question was answered in the Bolex Forum...this lens takes series 8 drop in filters. Thanks.