There have been over 119 rentals for Schneider 138mm Water White Diopter Set, you could earn $36/day renting this out.
SCHNEIDER 138MM DIOPTER SET INCLUDES,
all with pouches.
Schneiders 138mm Diopters allow close focusing beyond a lens' minimum focus distance. The set comes in 4 strengths: +1/2, +1, +2, & +3.