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The Sony FE 70-200mm F2.8 GM OSS is a premium, constant maximum aperture full-frame (FE) telephoto zoom lens for the Sony E-mount, announced by Sony on February 3, 2016. [ 1 ] [ 2 ] The 70-200mm f/2.8 lens is popular among event photographers and photojournalists where the lower light capabilities are required.
f / 2.8 2015 Yes G 602g 79mm 130.5mm 0.28m 1.00 62mm SEL-90M28G Macro lens. 100mm: f / 2.8 2017 Yes G Master 700g 85.2mm 118.1mm 0.57m 0.25 72mm SEL-100F28GM Smooth Trans Focus. 135mm: f / 1.8 2019 No G Master 953g 89.5mm 127mm 0.70m 0.25 82mm SEL-135F18GM 300mm [39] f / 2.8 2023 [40] Yes G Master 1470g: 124mm: 265mm: 2m: 0.16: 40.5mm: SEL ...
The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...
Given its unusually high 1:4 (0.25x) image reproduction ratio, the 100mm GM lens can be considered a pseudo-macro lens. Though designed for Sony's full frame E-mount cameras, the lens can be used on Sony's APS-C E-mount camera bodies, with an equivalent full-frame field-of-view of 150mm. Photo taken with a Sony FE 100mm F2.8 STF GM OSS lens
Decibels relative to full scale (dBFS or dB FS) is a unit of measurement for amplitude levels in digital systems, such as pulse-code modulation (PCM), which have a defined maximum peak level. The unit is similar to the units dBov and decibels relative to overload (dBO). [1] The level of 0 dBFS is assigned to the maximum possible digital level. [2]
DxOMark gave a score of 39 points for the Sony FE 24-70mm F2.8 GM II and 32 points for its predecessor, both tested on a Sony A7R IV. The measured sharpness increased from 33 Mpix to 40 Mpix, the measured chromatic aberration decreased from 10 μm to 5 μm, and the distortion (distortion of straight lines in the real world for example ...
The 300 mm f /2.8 APO was introduced in 1985 as one of the original dozen lenses released with the Maxxum/Dynax 7000. [1] Like contemporary Canon FD super-telephoto lenses, it was available exclusively with a white finish to reflect the sun, minimizing the effect of thermal expansion on optical alignment, [2] and carried a gold ring towards the front of the lens, [3]: 37 designating it as a (G ...
dBm or dB mW (decibel-milliwatts) is a unit of power level expressed using a logarithmic decibel (dB) scale respective to one milliwatt (mW). It is commonly used by radio, microwave and fiber-optical communication technicians & engineers to measure the power of system transmissions on a log scale , which can express both very large and very ...