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A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific eye. The symbols on an acuity chart are formally known as "optotypes". Variation of Snellen chart with another letter ...
Leica 50 mm f /1.4 Summilux-R 1st version; Leica 50 mm f /1.4 Summilux-R 2nd version; Leica 50 mm f /1.4 Summilux-R 3rd version – 1997 (ROM contacts) Leica 60 mm Macro-Elmarit-R 1st version – 1972 – outside bayonet lens hood fitting; Leica 60 mm Macro-Elmarit-R dn2 version; Leica 75 mm f /2.0 Elcan-R code C-341 – extremely rare
[1] The stroke width is 1 ⁄ 5 of the diameter, and the gap width is the same. [2] This is identical to the letter C from a Snellen chart. The Landolt C is the standard optotype for acuity measurement in most European countries. It was standardized, together with measurement procedures, by the German DIN, as DIN 58220 (now EN ISO 8596).
There are some variations in lens markings, depending on which camera it was bundled with initially; engraved on the ring around the front element for the version bundled with the Panasonic DMC-L1, the brand ("LEICA") is by itself on one side, opposite the lens name and data ("D VARIO-ELMARIT 1:2.8–3.5/14-50 ASPH.
An example of the Landolt C eye chart (also known as the Japanese eye chart). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]
Leica 35–70 mm f /3.5 Vario-Elmar-R zoom (Minolta design and glass production) Leica 70–210 mm f /4.0 Vario-Elmar-R zoom (Minolta design and glass production) Leica 75–200 mm f /4.5 Vario-Elmar-R – 1976–1984 (Minolta design and glass production) Leica 80–200 mm f /4.5 Vario-Elmar-R zoom; Leica 80–200 mm f /4.0 Vario-Elmar-R zoom
The chart was designed by Ian Bailey [5] and Jan E. Lovie-Kitchin at the National Vision Research Institute of Australia. [1] [3] They described their motivation for designing the LogMAR chart as follows: "We have designed a series of near vision charts in which the typeface, size progression, size range, number of words per row and spacings were chosen in an endeavour to achieve a ...
A Leica M8 with a Leica Noctilux-M 50mm f/1 lens. Optical Diagram of Leica Noctilux 50mm f/0.95 ASPH lens. detailed view. The name Noctilux is used by Leica to designate their camera lenses with the widest maximum aperture. Lenses with that name have been in production since 1966. So far all Noctilux lenses have been made for the Leica M mount.