RPP outer ring size for screw-on filter question

[Eli Jarra]

Does anyone know what size? I'm interested in a set of ND's but haven't gotten my set yet.
Thanks!

 

[PaulClements]

110mm outside diameter... 4x4 filters cover current crop of lenses... maybe go 4x5.65 for future wide angles though. LMB5 is a nice mattebox for them.

Paul

 

[Nils J. Nesse]

I think he's asking about screw-on filters for the front filter threads -- what size are those?

 

[Jeff Kilgroe]

4x4 filters would only barely cover. In fact at 25mm and wider, I don't see 4x4 covering if you're stacking two or more. And 4x5.65 is probably going to be necessary once 5K Mysterium-X coverage is needed.

As for front threads, I don't have my RPP's yet, so can't comment.

However, I do have the 300mm RPP and the front threads are not usable. That lens has a 112mm thread diameter, but the actual thread size is non-standard, so a 112mm filter only threads in about 1/2 turn before it locks up tight. These threads are more likely a part of the lens assembly process and not intended for filter use. I don't currently have any way of knowing if the other RPPs are the same way or not. If the threads are non-standard, a machine shop should be able to make an adapter ring if needed that would work for these lenses.

 

[PaulClements]

4x4 filters would only barely cover. In fact at 25mm and wider, I don't see 4x4 covering if you're stacking two or more.

It covered it this morning. 25mm with an LMB5 and two filter trays with 4x4 filters. Unless I dreamt it!

I will check again though since you've put doubt in my mind Jeff.

Paul

 

[PaulClements]

I think he's asking about screw-on filters for the front filter threads -- what size are those?

Ah sorry. I'll check when I get the time but probably not till after the weekend now.

Paul