I have a 4x4 mattebox-bellows/rail system on order, and have found a personal source for used 3x3 filters for a really good price. I was wondering if there exists such a holder that will allow you to put a 3x3 filter in a 4x4 frame, thus allowing it to go in a 4x4 mattebox, and center the 3x3 in front of the lens. It's a Cavision bellows mattebox I am trying to do this in, should anyone be curious.

Anyone know of such a thing? and where to get a few?

Thanks

-Brad

Chrosziel and Vocas/Century filter trays come in a 3x3 holder maed to fit a 4x4 slot. I'd be interested in finding out if these fit the cavision.

I checked out the three companies you listed.. the only evidence I could find of one was I think with Century.

http://www.centuryoptics.com/images/products/dv/mbstuff.jpg

is that it on the far right? The thicker frame?

Chrosziel and Vocas didn't seem to mention any such thing on their websites, or PDF catalogs.

-Brad

So can you use a 3x3 filter on a 72mm stock Canon 16x auto lens? Or will you see the edge of the filter? 3x3 is a few millimeters bigger than 72 I think... maybe you could only use one at a time and not stack em. hmmm...

-Brad

3"= 76.2 mm

Vocas make the century DV matte Box and the 3x3 frame is available from either
http://www.prosourcebmi.com/pdf/Shade_FX.pdf
http://www.centuryoptics.com/buying/prices/dv.pdf

The Chrosziel frames are on page 21
http://www.chrosziel.de/ACPL0902.pdf

I'd bet on the Chrosziel fitting , the Vocas is a tad oversized by the looks of it.