U.S. Air Force Senior Airman Alexander Peterson, 633rd Aerospace Medical Squadron ophthalmic technician, measures a patient’s prescription eyeglasses using a lensometer at Joint Base Langley-Eustis, Virginia, Jan. 27, 2020. The lensometer tells where the light is coming in. (U.S. Air Force photo by Airman 1st Class Sarah Dowe)
24.0-70.0 mm f/2.8
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