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Screws/screwdriver for Canon EF 100-400 mm f/4.5-5.6 II lensmm (1 Viewer)

Craig Thayer

Well-known member
For the lens referenced in subject line, I lost 2 screws for the silver lens mount (did not realize they were loose) . I ordered replacement screws.

I know screws should ideally be tightened with JIS/crosscut screwdriver (rather than standard Phillips screwdriver) but I need to know what size driver I should purchase (Canon customer service did not know answer !) . Also does anyone know where I could buy JIS screwdrivers (I live in U.S.)

Thanks !

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