1 Leaf shutters are usually fitted within a lens assembly (central shutter), or more rarely immediately behind (behind-the-lens shutter) or, even more rarely, in front of a lens, and shut off the beam of light where it is narrow. 2  Focal-plane shutters are mounted near the focal plane and move to uncover the film or sensor.
DHEA levels begin to naturally decline by the age of 30. While normal levels for women in their 20s fall between 65 and 380 Âµg/dL, for women in their 30s and 40s, the average normal range is 45 to 270 and 32 to 240 Âµg/dL, respectively.
If creatinine level is higher than the normal range, it usually indicates some health problems. Normal Range of Creatinine Level. The typical reference ranges are 0.5 to 1.0 mg/dL (about 45-90 Î¼mol/l) for women and 0.7 to 1.2 mg/dL (60-110 Î¼mol/l) for men.