Kodak Polycontrast Filter Set brand_Whitehouse Products Inc. I say "relatively compact" because

I say "relatively compact" because it's slim enough to fit in a normal-sized backpack without too much drama

But function is good

but this does not impede usability

Pentax rolled the dice on SLR design sometime in the late 80s and it didn't quite catch on

no mounting hardware or fresnel

Kodak Polycontrast Filter Set brand_Whitehouse Products Inc. I say "relatively compact" becauseThis is a complete Kodak Polycontrast filter set, with seven 3x3" mounted filters from grades 1 to 4 in half stop increments. Yes, these are compatible with Ilford Multigrade papers: they may not produce the exact same contrast as an equivalent grade Ilford filter, but they will definitely do the job. In very good cosmetic condition, with plastic case.