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It derives its performance from a patented innovation called the Twin RX Technology which combines a method for calculating lens optics, Essilor's Wavefront Magement System and advanced digital surfacing. [24] The progressive lens is also available as the Varilux Physio F-360, which require more measurements and is therefore more personalized.
DxO PureRAW: Launched in 2021 [23] DxO PureRAW is essentially the RAW conversion engine developed for Optics Pro and PhotoLab. It is designed to remove noise, chromatic aberrations, vignetting, distortion, and lens softness to improve the overall quality of a single image or batch of photographs prior to editing in another program. [24]
The DXOMARK Lens Score provides ratings for camera lenses, as tested using its proprietary tool-set in combination with various camera models. [8] [10] [17] As with the DxOMark Sensor Score, the DXOMARK Lens Score is an aggregation of five separate sub-scores; namely: sharpness, distortion, vignetting, transmission, and chromatic aberration.
The front element of the Tessar can be replaced to make a long-focus or wide-angle lens. In 1957 Carl Zeiss offered the long-focus Pro Tessar 115 mm f/4 and 85 mm f/4, and the wide-angle Pro Tessar 35 mm f/3,2 for use on the central-shutter SLR Zeiss Ikon Contaflex Super B cameras.
A "slow" lens (one that is not capable of passing a lot of light through) might have a maximum aperture from 5.6 to 11, while a "fast" lens (one that can pass more light through) might have a maximum aperture from 1 to 4. Fast lenses are, by definition, larger than slow lenses (for comparable focal length), and typically cost more. [2]
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Today the complex surfaces of a progressive lens can be cut and polished on computer-controlled machines, allowing 'freeform surfacing', as opposed to the earlier casting process, thus explaining the difference in price. In short, the price is based on the technology used and the year the lens came to market.
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