What do people use?

I've tried various combinations of:

Mamiya square lens hood (the small lens 48mm o/d one)
Rubber 49mm lens hood

46mm polarizers

46-49mm step up ring
49mm red or orange filters

Cokin-A filters with 49mm adapter ring and 46-49 step up.

55, 80 & 135mm lenses.

My conclusions from the above are that:

* Mamiya lens hood precludes use of any filters.
* 135mm vignetting, using the same filters / hoods vignettes as least as
much as 55mm.
* Vignette is worse at small apertures
* One filter 46 or 49mm or hood is usually free from vignette.
* One filter + hood or two filters usually have some vignetting, but with a
small crop it is probably not problematic.
* Two filters + lens hood will certainly give problems.
* Cokin-A usually works - can vignette if you missalign the holder.
* 55mm lens + polarizer + 46-49mm adapeter + Cokin A vignettes.

I can, sort of improvise when not using a hood by shading the taking lens
with my hand, awkward and hit and miss.  I would like to use an orange
filter plus polarizer, hence am looking for a two filter solution.  Adding
a hood if possible might be a good plan.

Any thoughts on solutions for using one or two filters plus a hood?  I'm
wondering if a 46-49mm step up ring and using 55mm filters would be a
solution?  Using a non-square hood does cause a little of the viewing lens
image to be obscured, but that is usually not too much of a problem.  If,
and this is a big if, a Cokin-A polarizer sits oin the holder AND does not
vignette, maybe that is a solution.  Obviouly a 46mm Cokin adapter ring
would not hurt.

Anyone with any experience to share?

Thanks,

Pete