New Patent: Sigma 28-200mm f/3.4-5.6 DG Lens

Sigma has filed a new patent for Sigma 28-200mm f/3.4-5.6 DG Lens for Sony E-mount full frame mirrorless cameras. Take a look at the patent details below: 【Publication number】 JP 2020-204684(P2020-204684A) 【Release date】 December 24, 2020 【Patent application title】 Imaging optical system Embdiment 1 Zoom ratio: 7.14 Focal length: 27.99 71.70 199.93 mm F number: 3.37 4.67 5.60 Angle of […]

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Sigma Patents: 28-70mm f/2.8, 28-100mm f/4, 24-100mm f/4, 20-80mm f/4 Lenses

Sigma filed a patent for DG DN standard zoom lenses for Sony E-mount full frame mirrorless cameras. Take a look at the patent details below: 【Publication number】 JP 2020-197597(P2020-197597A) 【Release date】 December 10, 2020 【Patent application title】 Imaging optical system Embodiment 1: 28-70mm F2.8 Zoom ratio: 2.50 Focal length: 28.95 45.80 72.45 mm F number: 2.93 2.91 2.92 Angle of […]

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Tamron 70-300mm F/4.5-6.3 Di III RXD Lens Review (by PhotographyBlog)

The Photography Blog has published the Tamron 70-300mm F/4.5-6.3 Di III RXD Lens for Sony E-mount review (tested on the 24MP Sony a7 III): “this is a great 70-300mm all-purpose telephoto zoom that’s a real testament to modern optical technologies”. Tamron 70-300mm F/4.5-6.3 Di III RXD Lens Key Features E-Mount Lens/Full-Frame Format Aperture Range: f/4.5 to f/22 Low Dispersion Front […]

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