It is the first camera with built-in exposure meter, capable of measuring the light through the lens, the so called Through-the-lens metering (TTL).
Through-the-lens metering, a camera feature that permits light metering through the taking lens itself, rather than via a separate window
Lens | Lens, Pas-de-Calais | Independent Lens | Nicholas Lens | lens | Fresnel lens | Single-lens reflex camera | Panasonic Lumix 45mm lens | Panasonic Lumix G 14mm lens | Panasonic Lumix 20mm lens | Panasonic Leica DG 25mm lens | M42 lens mount | Lens (optics) | Judith of Lens | Digital single-lens reflex camera | Ultra wide angle lens | Through-the-lens metering | Mirrorless interchangeable-lens camera | Lens (Pas-de-Calais) | lens (anatomy) | Lambert II, Count of Lens | Bernard Lens | Achromatic lens | Zoom lens | zoom lens | Telephoto lens | single-lens reflex camera | Sidney Lens | Panasonic Lumix G X Vario PZ 45-175mm lens | M.Zuiko Digital ED 9-18mm f/4-5.6 lens |