History of The Single-lens Reflex Camera - Through-the-lens Metering

Through-the-lens Metering

Through-the-lens metering measures the light that comes through the camera lens, thus eliminating much of the potential for error inherent in separate light meters. It is of particular advantage with long telephoto lenses, macro photography and photomicrography. The first SLRs with through-the-lens metering were introduced by Japanese manufacturers in the early to mid 1960s.