1. TTL ) exposure metering, and at full lens aperture at that. 2. The important measure related to DOF is the lens aperture . 3. The lens is modified such that each colour channel has a different lens aperture . 4. The lens aperture is usually specified as an f-number, the ratio of focal length to effective aperture diameter. 5. "Multi-shot " exposes the sensor to the image in a sequence of three or more openings of the lens aperture . 6. The F-401 introduced the now common-place feature of using a thumbwheel instead of lens aperture ring to adjust the aperture. 7. DOF is determined by subject magnification at the film / sensor plane and the selected lens aperture or " f "-number. 8. The photographer would adjust the shutter speed and / or the lens aperture f-stop until the OVER or UNDER LED went out. 9. A total aperture of 8 corresponds to a lens aperture of 5.6, 4 and 2.8 with a 1.4x, 2x and 3x teleconverter, respectively. 10. It is true the finder does not go black during exposure, but at small lens apertures , the eye has no time to adjust to the dark finder.
