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The standard lens is the Carl Zeiss Planar 1:2 f=50mm in bright aluminium finish with a chrome 49 mm thread filter ring and an outer bayonet for Zeiss-Ikon filters. The lens focuses to 0.3 m (1 ft 0 in), which is closer than the usual 0.5 m (1 ft 8 in) for a normal lens. The focusing helical is remarkably smooth and precise.
From left, Sonnar 135 mm f /2.8, Distagon 25 mm f /2.8, Sonnar 85 mm f /2, Planar 50 mm f /2 Sonnar 135 mm f /2.8 inside front of lens info These are all the first-party lenses for the Contarex system; all but one (the PA-Curtagon ) were designed and manufactured by Carl Zeiss . [ 1 ]
Right and left were identical variable power lenses with distance and reading power centers in the upper and lower part of the lens, respectively. The glazing was made to accommodate eye position changes from distance viewing to reading. The point of reading is about 14 mm below and 2 mm to the nasal side in comparison to distance viewing.
It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch. (The M42 lens mount should not be confused with the T-mount , which shares the 42 mm throat diameter, but differs by having a 0.75 mm thread pitch.)
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
In statistical quality control, the individual/moving-range chart is a type of control chart used to monitor variables data from a business or industrial process for which it is impractical to use rational subgroups. [1] The chart is necessary in the following situations: [2]: 231
The Contaflex I, launched in 1953, was equipped with a fixed Zeiss Tessar 45 mm f /2.8 lens with front-cell focusing. [2] The earliest Contaflex I cameras had a Synchro-Compur shutter with the old scale of shutter speeds (1-2-5-10-25-50-100-250-500) and no self-timer, but very soon it adopted the new scale 1-2-4-8-15-30-60-125-250-500.
The 5 cm f/1.5 Sonnar is still considered to be one of the finest lenses ever produced for the 35mm film format. [ citation needed ] In addition Zeiss quickly marketed a wide range of accessories and additional tools that formed the most extensive camera system of the 1930s, 1940s and early 1950s.