Macro Photography on a Budget: An introduction to Close-up Filters
Amazon.com : 49mm Macro Close-Up Filter Set (+2 +4 +8 +10) Macro Filter Accessory with Filter Pouch for Canon EOS M6, M6 Mark II, M5, M50, M50 Mark II, M200 with Canon
Vivitar 77mm Close Up Macro Lens Kit VIV-CL-77 B&H Photo Video