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Visual acuity is a subjective test meaning that if the patient is unwilling or unable to cooperate, the test cannot be done. A patient who is sleepy, intoxicated, or has any disease that can alter their consciousness or mental status, may not achieve their maximum possible acuity.
The 550 mm lens is a 6/2 construction, giving 78° of coverage, while the 1100 mm lens is 4/4 with 45.7° of coverage. Both lenses are mounted in a Copal 3 shutter, and the longer lens is also available in a barrel mount with Waterhouse stops, if the faster f/14 version is desired. 550mm f/11; 770mm f/14.5; 1100mm f/22(14)
High quality camera – In May 2020, the 12.3-megapixel Sony IMX477 Exmor sensor camera module was released with support for C- and CS-mount lenses. [262] The unit initially retailed for US$50, with interchangeable lenses starting at US$25.