Canon EF 24-70mm f/2.8L II USM

The filter size is 82mm.

Yes, the lens is weather-sealed to protect against dust and moisture.

The closest focusing distance is 0.38 meters.

No, this lens does not have image stabilization.

It uses a Ring USM (Ultrasonic Motor) autofocus system.

The maximum aperture is f/2.8.

Yes, it is part of Canon's L-series and designed for professional use.

It is compatible with all Canon EOS cameras with an EF mount, including full-frame and APS-C sensor cameras.

Ensure the lens is set to autofocus mode on the camera and the lens itself. Clean the lens contacts on the lens and camera body. If the problem persists, try another lens to determine if it's a camera or lens issue.

Check the focus point and make sure the subject is in focus. Ensure your shutter speed is fast enough to avoid motion blur. Clean the lens surface and check for any obstructions. If shooting in low light, consider using a tripod.

Make sure the lens is properly attached to the camera body. Clean the lens contacts on the lens and camera. Try removing and reattaching the lens. Check your camera manual for specific error messages.