this is normal.

It is normal to change the lens. Just turn off the power and restart it as usual.

Sony a7m4 basically continues the shape design of A7s3, and its weight is about 573g, which is a circle larger than that of the third-generation a7m3, but the weight of several machines is actually similar. The handle is widened to improve the grip feeling, and a7m4 adds a shift dial below the mode dial in the key design. It includes three gears: camera, video and SQ, which realizes double-layer mode control. When the gear is selected in the photo file, three sets of preset settings can be stored, and the preset settings can be quickly called by rotating the mode dial above.