Used Red/Orange/Yellow 43.5mm filters for B&W
Used Black and White photography filters 43.5mm for Olympus Trip 35 cameras.
The filters are for controlling contrast in B&W photography: Red has the strongest contrast followed by orange and then yellow, which has the weakest effect.
Easy to use - the exposure is adjusted by the Trip 35 as the light cells are behind the filter.
The filters are in optically very good clean condition and come in a small plastic bag.