Laowa 4mm f2.8 Fisheye Lens - Micro Four Thirds

No, this is a fully manual focus lens.

This lens is designed specifically for Micro Four Thirds sensors; it will not cover a full-frame sensor and will result in heavy vignetting.

No, the lens does not feature specific weather-sealing. Avoid using it in heavy rain or extremely dusty environments.

You can use post-processing software like Adobe Lightroom or dedicated de-fishing plugins to correct the geometry to a rectilinear wide-angle look.

Yes, its extreme 210-degree field of view makes it excellent for vlogging, as it captures the environment around you even when the camera is close to your face.

Due to the extreme bulbous front element, it is not possible to attach standard screw-on filters to this lens.

Go into your camera's custom menu settings and enable 'Shoot without lens' or 'Release shutter without lens'.

Ensure you are manually focusing correctly. Due to the extreme depth of field, stopping down to f/5.6 or f/8 helps keep most of the scene in focus without needing constant focus adjustment.

This is characteristic of a circular fisheye. Use your editing software to crop the image or apply a 'de-fish' lens correction profile to achieve a standard ultra-wide aspect ratio.