The Canon 43mm Protect Filter is useful as a general protective filter to leave on lenses at all times. Filters help to reduce dust and moisture from reaching your lens element and provide additional protection in case of drops or situations where scratching could occur. No additional coloration or contrast is provided, allowing you to pair the filter with others. For EF-M 22mm f/2 STM, EF-M 28mm f/3.5 Macro IS STM