I have a Kodak Series Vl Adapter Ring (1-1/2 in to 38mm) lens hood for a Optar f 4.7 135mm Graflex lens. The lens hood part of course can screw off, leaving a threaded coupling for a filter adapter. But I take it this is 1-1/2.

I did a search and there is discussion of dual thread retainer ring and Series Vl to different size adapters, but I'm at a loss of what I need to look for in order to use my 52mm B&W filters.

Somebody please give me a clue.

Lets see, click on the site search button, type series VI in the keyword box, select search for all the terms dot then search and we get 763 posts containing series and VI.

http://graflex.org/helpboard/viewtopic.php?t=1727
tells us that a series 6 filter adapter has a 44mm thread. This is a difficult one to find.

Thread pitch is .8mm.

For filter size range:
http://graflex.org/helpboard/viewtopic.php?t=264

All series 6 filter holders use a 44mm retainer ring thread. A dual threaded retainer ring allows one to use a standard filter and a polarizer in combination.

Ok thanks for the 44mm info.. I'm on a hunt, and your right .. dey ain't out dar, easy to find.

If I can't find one, I'll have to get creative.

Scroll down to my recent post at http://graflex.org/helpboard/viewtopic.php?p=34036#34036 for more info.