My wife bought me a box of a couple dozen Marumi filters for 5 bucks at a flea market. There are adapter rings that screw onto the lens so that one size filter will fit a few lenses. Then they just slip onto the ring. Most I can figure out what they do, #3 close-up, cross hatch. Others will take some playing with. Duto and jupiter with and w/o a center hole in the glass for example. There are a bunch of color ones though, red r2, yellow y2 and a lot of shades of gray. Were the color ones made for B&W film? I put the red on and.... yup, everything was red.
They are all in a plastic case but no other packaging, I would guess 25 years old. Should give me some fun playing around with them.
