Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 600

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Interchangeable Lens Digital Camera

Release w/o Lens

Sets whether or not the shutter can be released when no lens is attached.

(Camera Settings2) → [Release w/o Lens] → desired setting.

Menu item details

Releases the shutter when no lens is attached. Select [Enable] when attaching the product to an astronomical telescope,

Does not release the shutter when a lens is not attached.

Correct metering cannot be achieved when you use lenses that do not provide a lens contact, such as the lens of an

astronomical telescope. In such cases, adjust the exposure manually by checking it on the recorded image.