Panasonic Lumix S Pro 50mm f/1.4 Lens - Panasonic

The filter size is 77mm.

The closest focusing distance is 0.44 meters.

Yes, the lens is dust- and splash-resistant.

The maximum aperture is f/1.4.

This lens is compatible with Panasonic LUMIX full-frame mirrorless cameras with the L-Mount.

No, this lens does not have built-in image stabilization.

The weight of the lens is 955g.

The operating temperature range is -10 to 40 °C.

Ensure the lens is set to the correct focus mode (AF or MF) on both the lens and camera body. Clean the lens contacts and try again. Make sure there isn't any obstruction on the focus ring.

Make sure your subject is in focus. Check the aperture setting; wider apertures (lower f-numbers) have a shallower depth of field, so precise focusing is crucial. Ensure your shutter speed is fast enough to prevent blur from camera shake. Try using a tripod.

Make sure that the subject has enough contrast for the autofocus system to identify it. Try a different focus mode on the camera (e.g., single-point AF). Clean the lens contacts and ensure your camera firmware is up to date.

Ensure the lens is properly mounted on the camera and that the lens contacts are clean. Verify camera firmware is up to date.