I have the 49 mm lens adapter ring, but I don't have that many 39 mm filters and would just as soon use an adapter ring with it and use my Lee filters with it. I just wondered if there were any problems with vignetting? The lenses I would be using them on are the 35, 50 & 90 mm M lenses; I think 2 and/or 2.8 are their widest apertures.
I haven't used that specific one, but I use conventional step-up rings to adapt to my HiTech holder when doing IR with gel filters. I wouldn't think you'd encounter any vignetting problems with that large of a step-up. You might, however, want to be cautious about potential increased flare.
[COLOR=SlateGray]"You can't depend on your eyes if your imagination is out of focus." -Mark Twain[/COLOR]