Originally posted by pentaxus Yeah. Removing the glass out of an old or cheap (if possible in 82mm) is the way to go.
I found an old Nikon 82mm UV filter in a box of stuff in the basement. There didn't appear to be an especially easy way to remove the retaining ring, there were no threads leading to it, so I wrapped it in a paper towel and whacked it with a tack hammer. The glass came out with little fuss.
I put the filter onto that ring, and it immediately jammed......
The Breakthrough ring is brass, but the Nikon one is aluminium. If it ever comes off, it's a small bonus. Right now I'm not too worried, unless the Nikon ring jams on the lens. I've never had this sort of problem before with filters. Normally they behave very nicely for me.
---------- Post added Aug 12th, 2020 at 10:34 AM ----------
Originally posted by dlh I find that aluminum rings get bound up far more easily than brass; the aluminum is more difficult to machine to a smooth surface, especially in the threads. It has problems with galling and pitting. I always buy brass components nowadays. Also, I find that a very, very thin coat of vaseline on the threads is a big help. I use a toothpick to apply an amount that would be too small to measure in mililiters to the male threads on the filter and smear it around the threads, keeping only to the threads, all the way around, then screw it in and unscrew it a few times to distribute the grease evenly. Then I wipe out the threads on the lens to make sure there won't be any on the glass, relying on the thin coat still on the filter threads for lubrication. By the way, this increases the need for cleaning, as stuff will stick to the grease (dirt, cat hair, dust, etc.).
Thanks for the tip. I will probably do this with the 85. It seems to like filters sticking on it a bit too much for my taste. The Breakthrough X4 filter rings are brass, but the ring is very shallow and get's lost in the lens.