Filter Really Stuck...Help!

[John Layton]

So...my fancy 82mm B+W ND filter is really stuck to my "bargain" step-up ring. Have tried my usual tricks...including using two light cords in opposite directions, and dunking the step up half into boiling water. Problem is, the seizing together took place as I was photographing surf - and my guess is that there has been some salt-related welding between the brass and aluminum components (why I tried the boiling water).

Anything else I might try before I fire up my dremel? (to use cutoff wheel to remove step up ring). Thanks!

[consummate_fritterer]

If you do cut it off, make sure you thoroughly cover the glass before cutting and assure every spec of ground metal is removed.

[cowanw]

Did you try rubber gloves?

[dentkimterry]

I've used a hair dryer to heat the step ring with success.
Terry

[EdSawyer]

heat gun, for sure. Also, opposing strap wrenches if you can.

[BBW]

Try some deep penetrating oil. You may have to let it sit for a day soaking, but it has helped me break loose a few trumpet slides without damage. Trying pressure on rings with gorilla force, I have discovered, not so good since the added pressure distorts the ring somewhat, adding to the problem. Let the oil do its work and GENTLY get a grip to twist. Cheers!

[Leigh]

You need a pair of lens wrenches, properly sized to apply pressure evenly around the circumference.
B&H Photo and other photo stores all sell them.

Alternatively, a thin flat sheet of rubber on the table.
Place the lens vertically with the filter on the rubber and turn it, applying downward pressure.

- Leigh

[HMG]

I would also try penetrating oil (Kroil is often recommended) before the dremel.

[GoodOldNorm]

Try some deep penetrating oil. You may have to let it sit for a day soaking, but it has helped me break loose a few trumpet slides without damage. Trying pressure on rings with gorilla force, I have discovered, not so good since the added pressure distorts the ring somewhat, adding to the problem. Let the oil do its work and GENTLY get a grip to twist. Cheers!

There are penetrating oil tests on Youtube.

[Pieter]

Another vote for filter wrenches. They let you apply equal force to the two rings so uneven distortion does not make unassembly harder.