Behind the lens neutral density for a Red One?

[Jodie Mize]

I'm wondering if there is any universal neutral density that attaches behind the lens to a PL mount, allowing the lens the mount in front of it? It seems like this would be VERY handy... Any suggestions?

 

[Jason Comparetto]

Its tempting... but it seems like there wouldn't be alot of room between the rear element and the sensor housing. Just eyeballing it, it looks like less than a 1/2" of gap. I could be mistaken, but I think the rear element protrudes beyond the back of the PL mount, so even if it was possible it would be a set of levels that would have to transfer to behind the rear element. But I'm not the authority-- perhaps there is a manufacturer out there that made a crazy PL mount with levers going behind the rear element.

 

[Julio Quintana]

I'm wondering if there is any universal neutral density that attaches behind the lens to a PL mount, allowing the lens the mount in front of it? It seems like this would be VERY handy... Any suggestions?

I started a similar thread today asking about a lens rear filter holder: http://www.reduser.net/forum/showthread.php?104121-Epic-Lens-Rear-Filter-Holder

It seems to be a popular topic this week but maybe a more complicated one than it appears at first glance.

Julio

 

[Jason Comparetto]

Reading those other threads that Julio provided made it sound like its hard enough just to get the optics right, let alone the geometry and physical space constraints. Now you have peaked my interest!

 

[Ron Steinberg]

Not impossible at all. I saw just such a system at NAB this year marketed by Schneider Optics:

http://www.fdtimes.com/2012/11/23/clairmont-alexa-in-camera-filter-system/

In fact I'm meeting with Ryan Avery and Ira Tiffen tomorrow to discuss. They wanted my employer to distribute them in Canada, but the market is very small. Obviously this is for Alexa, but I see no reason why it could not be adapted to Epic etc. Flange focal distance is the same for all of these cameras by factor of using PL glass. Personally though, I'd stick with traditional ND's etc in a matte box. Although the Blue Streak filters look cool - no glass required!