Canon ET-120B Lens Hood - Canon - 2346B001

Its main purpose is to block stray light from hitting the front lens element, which helps prevent lens flare, reduces ghosting, and improves overall image contrast and color saturation.

No, the ET-120B Lens Hood is specifically designed and compatible only with the Canon EF 200mm f/2L IS USM lens. Using it with other lenses may not provide a secure fit or optimal performance.

Yes, it provides a degree of physical protection to the front lens element against accidental bumps, scratches, and dust.

Clean it with a soft, dry microfiber cloth. For tougher marks, use a slightly damp cloth with water or a mild lens cleaner, then dry thoroughly.

The ET-120B is designed to work with the EF 200mm f/2L IS USM lens and should not cause vignetting (darkening of the corners) under normal shooting conditions.

Yes, it features a bayonet mount that allows for quick and secure attachment and removal by aligning and twisting.

Ensure you are using the correct lens (Canon EF 200mm f/2L IS USM) and that the alignment grooves on the hood and lens are clear of debris. Check that the hood is rotated fully clockwise until it clicks into place.

Re-attach the hood, ensuring it is fully seated and locked. If the issue persists, there may be wear on the mounting mechanism of either the hood or the lens; inspect both for damage.

While designed to prevent this, ensure the hood is fully attached and correctly aligned. In very specific wide-angle shooting scenarios (though unlikely with a 200mm lens), extreme angles of light *might* cause slight obstruction. If the problem persists across multiple shots and lighting conditions, double-check compatibility and attachment.