It depends on how many you stack. I never noticed any problem with my 58mm with the polarisor on. The Hoya is thinner than a Tiffen so much less likely to vignette. I think the Tiffen filters are about the thickest.

It really gets hairy on wide angle adapters, that's most likely why most of them don't have a filter thread. My optex will show vignetting with a polarisor,but only on the overscan (the part that isn't shown on the TV)

You won't have a problem with any normal filter. You don't need the thin filters for the lens on a 2000.

The standard hoya is thinner than the tiffen, as a matter of fact the tiffen is about the widest of the lot by 1 mm. On my 58mm lens I use standard filters.

help need for 85mm non-thread filters
 

hi every body !
i'm new to this board - i'v been listening to this forum for
the last couple of months and finally i bought a new GL2 from my
local store....
i bought a cheap filter sets and lens combo from
Ebay. They sent me the correct set of 3 filters (58mm) ..a correct
tele 2x lens.. and a 0.45 WideAngle lens w/macro that is different (wrong one ) than the one displayed on Ebay pictures.
I tested this wrong one and it works very good, in deed i believe
this is a very high quality one (well, compare to my friend's one).
The problem is one of its end is threaded 58mm but it fans out
to a non-threaded 85mm end.
I tried to sandwich an aluminum thin filter in between the GL2 main lens .....and this WA bended the threads of the aluminum filter because this WA lens is too heavy.
Can any one show me where to get the no-thread 85mm filters.

PS. my included GL2 lens hood is not large enough to cover the
85mm WA lens.

Thanks alot