Sigma 15-24mm f/1.8, 16-28mm f/1.8, and 18-30mm f/1.8 Patents Found

Here are some newly spotted wide-angle Sigma zoom lens patents that are f/1.8. The Sigma 15-24mm f/1.8, 16-28mm f/1.8, and 18-30mm f/1.8 could all be useful zooms, but they will likely be very expensive given their fast apeture.

IP Force

  • Applicant: Sigma Co., Ltd.
    Publication number: P2022126058
    Application number: P 2021023909
    Publication date: 2022-08-30Title
    of invention: Zoom lens
  • A large aperture wide-angle zoom lens capable of high-speed AF control, suppressing aberration fluctuations during focusing, and compatible with a large format camera is provided with a compact optical system.
  • The zoom lens described in Patent Document 1 achieves weight reduction of the focus group. However, it is difficult to apply to a large-aperture zoom lens because of its dark open F-number and insufficient correction of various aberrations such as longitudinal chromatic aberration and curvature of field.
  • The zoom lens described in Patent Document 2 achieves weight reduction of the focus group and improves longitudinal chromatic aberration and curvature of field as compared with Patent Document 1. However, since the total length of the optical system is long, it is not realistic to make the optical system extremely large if it is to be used with a large-aperture camera or a large-format camera with a large maximum image height.
  • According to the present invention, the optical system is made compact by shortening the overall length and reducing the outer diameter. The focus lens group is light, and high-speed AF control is possible. It is possible to provide a large-aperture, wide-angle zoom lens that can be used with any camera and has high optical performance.

Continue reading “Sigma 15-24mm f/1.8, 16-28mm f/1.8, and 18-30mm f/1.8 Patents Found”

Sigma 20mm & 24mm f/1.4 DG DN Art Lenses Officially Announced

Sigma has officially announced two new wide angle prime lenses for Sony E-mount: Sigma 20mm f/1.4 DG DN Art Lens and Sigma 24mm f/1.4 DG DN Art Lens. The price for Sigma 20mm f/1.4 DG DN Art Lens is $899, and the price for Sigma 24mm f/1.4 DG DN Art Lens is $799.

Sigma 20mm f/1.4 DG DN Art Lens: $899 at B&HAdorama.

Sigma 24mm f/1.4 DG DN Art Lens: $799 at B&HAdorama.

Sigma 20mm f/1.4 DG DN Art Lens Key Features

  • E-Mount Lens/Full Frame Format
  • Aperture Range: f/1.4 to f/16
  • Two SLD Elements
  • Three Aspherical Elements
  • Super Multilayer Coating
  • Stepping AF Motor, MFL Switch
  • Rounded 11-Blade Diaphragm
  • 82mm Front Filter Thread
  • Rear Filter Holder
  • Durable Brass Bayonet Mount

Sigma 24mm f/1.4 DG DN Art Lens Key Features

  • E-Mount Lens/Full-Frame Format
  • Aperture Range: f/1.4 to f/16
  • Two FLD Elements and One SLD Elements
  • Four Aspherical Elements
  • Super Multilayer Coating
  • STM Autofocus Motor
  • Rounded 11-Blade Diaphragm
  • Brass Bayonet Mount
  • 72mm Front Filter Threads
  • Rear Filter Holder

Press release: Continue reading “Sigma 20mm & 24mm f/1.4 DG DN Art Lenses Officially Announced”

Sigma 20mm f/2, 24mm f/2, and 28mm f/2 Patents Found

Sigma has filed new patents for three different lenses with f/2 aperture size. These lenses are Sigma 20mm f/2, 24mm f/2, and 28mm f/2 Lenses for Sony E-mount full frame mirrorless cameras. Continue reading “Sigma 20mm f/2, 24mm f/2, and 28mm f/2 Patents Found”

Sigma Patents for 24-70mm F2.8, 28-70mm F2.8 and 28-85mm F2.8

Sigma has filed new patents for 24-70mm f/2.8, 28-70mm f/2.8 and 28-85mm f/2.8 Lenses for Sony E-mount full frame mirrorless cameras.

[Publication number] P2022067732
[Publication date] May 9, 2022
[Patent application title] Large-diameter zoom lens

Example 1 (24-70mm F2.8)

Zoom ratio 2.75 Wide-
angle intermediate telephoto
focal length 24.72 39.76 67.98
F number 2.92 2.92 2.92
Full angle of view 2ω 85.24 56.96 34.33
Image height Y 21.63 21.63 21.63
Lens total length 135.00 145.60 171.09
Back focus 17.6206 17.6036 17.5749

Example 3 (28-70mm F2.8)

Zoom ratio 2.35 Wide-
angle intermediate telephoto
focal length 28.81 40.01 67.69
F number 2.92 2.92 2.92
Full angle of view 2ω 75.92 56.06 33.85
Image height Y 21.63 21.63 21.63
Lens total length 120.04 126.08 142.66
Back focus 19.6292 19.5884 19.6020

Example 4 (28-85mm F2.8)

Zoom ratio 2.90 Wide-
angle intermediate telephoto
focal length 28.79 49.98 83.51
F number 2.92 2.92 2.92
Full angle of view 2ω 75.61 45.42 27.77
Image height Y 21.63 21.63 21.63
Lens total length 135.02 146.97 164.94
Back focus 17.6146 17.5433 17.5817

Sigma 70mm f/2.8, 90mm f/2.8, and 100mm f/2.8 Patents Found

New Patents for Sigma 70mm f/2.8, 90mm f/2.8, and 100mm f/2.8 compact mirrorless lenses have been found. The Sigma 90mm has already been announced.

Sigma 90mm f/2.8 DG DN | Contemporary: B&H Photo / Amazon / Adorama

  • Applicant: Sigma Co., Ltd.
    Publication number: P2022061515
    Application number: P 2020169465
    Publication date: 2022-04-19 Title
    of invention: Imaging optical system
  • PROBLEM TO BE SOLVED: To provide a compact imaging optical system having a quiet and rapid focus in which various aberrations are well corrected in a lens for a digital camera or a video.
  • In recent years, there is an image pickup device in which the mirror portion is removed to shorten the distance between the image pickup optical system and the image pickup element.
  • Among them, a large-sized image pickup device and a miniaturized image pickup device are widely used. In contrast to the miniaturized image pickup apparatus, the imaging optical system is also required to be miniaturized in overall length and outer diameter.
  • According to the present invention, it is possible to obtain a compact imaging optical system having a quiet and rapid focus in which various aberrations are well corrected in a digital camera or a lens for video.

Example 4 (70mm F2.8)
Infinity Shortest shooting distance
Focal length 72.10 66.91
F number 2.90 2.90 Full angle of
view 2ω 31.67 31.76
Image height Y 21.63 21.63
Lens total length 70.44 70.44

Example 5 (100mm F2.8)
Infinity Shortest shooting distance
Focal length 102.00 93.47
F number 2.90 2.89
Full angle of view 2ω 22.67 22.83
Image height Y 21.63 21.63
Lens total length 87.72 87.72

via digicame-info

Sigma Firmware Updates: 16mm/30mm/56mm f/1.4, 35mm f/2 DG DN Contemporary Lenses

Sigma has released the new firmware updates for 16mm f/1.4, 30mm f/1.4, 56mm f/1.4 & 35mm f/2 DG DN Contemporary Lenses for Sony E mount. You can follow the links below to download the firmware updates.

Sigma 35mm F2 DG DN | Contemporary
Adorama
Ver.02 2022.04.07
It reduces the AF drive sound.

Download Here

Sigma 16mm F1.4 DC DN | Contemporary
Adorama
Ver.03 2022.04.07

The specification has been changed so that the focus position of the lens when the ON/OFF (power) switch is turned “ON”, or when the camera is restored from power save, is set to the same shooting distance when the ON/OFF (power) switch was turned “OFF” or when power save was activated.

Download Here

Sigma 30mm F1.4 DC DN | Contemporary
Adorama
Ver.04 2022.04.07

The specification has been changed so that the focus position of the lens when the ON/OFF (power) switch is turned “ON”, or when the camera is restored from power save, is set to the same shooting distance when the ON/OFF (power) switch was turned “OFF” or when power save was activated.

Download Here

Sigma 56mm F1.4 DC DN | Contemporary
Adorama
Ver.02 2022.04.07
・The focus position of the lens when the ON/OFF (power) switch is turned “ON” or when the camera is restored from power saving has been changed to the specification that the focus position is set to the shooting distance right before the ON/OFF (power) switch is turned “OFF” or power saving is activated.
・Improved feeling of the MF operation of the lens.

Download Here

Best 24mm Lens for Sony (Samyang, Tamron, Sigma, Viltrox VS. Sony)

Lensvid published a comprehensive lens review roundup, looking at five different full-frame E-mount lenses from Sony, Samyang, Tamron, Sigma, and Viltrox. In order to find out which is the best 24mm lens for full-frame e-mount cameras, all these lenses are at the 24mm focal length

The lenses that we shall be reviewing today are the following:

Sigma 28-70mm f/2.0 Full Frame Lens Patent Found

New Sigma patent discloses the 28-70mm f/2.0 specs for full frame mirrorless.

Sigma 28-70mm f/2.0 full frame  lens patent

  • Focal length: 28.90-67.75
  • F value: 2.07
  • Angle of view: 76.73-33.8
  • Image height: 21.63
  • Overall length: 147.85-11.89

Asobinet found several new Sigma patents online. Here are the other Sigma lenses:

  • 28-70mm f/2.0 for full frame mirrorless sytems
  • 14-30mm f/4.0 for full frame mirrorless sytems
  • 20mm f/1.4 for APS-C mirrorless sytems
  • 23mm f/1.4 for APS-C mirrorless sytems
  • 28mm f/1.4 for APS-C mirrorless sytems
  • 33mm f/1.4 for APS-C mirrorless sytems

The fast aperture standard zoom lens will compete against the  the current Tamron 28-75mm F2.8 Di III RXD lens and Sigma 28-70mm F2.8 DG DN Contemporary lens.

Sigma announces 20mm F2 DG DN lens for E-mount

Sigma has announced the 20mm f/2 DG DN Contemporary lens. Designed for  full-frame Sony E mount, you can use this premium lens on mirrorless cameras such as the Sony A7 IVSony A7R IV

The US price is $699 at B&HPhoto and Adorama.

Sigma 20mm F2 DG DN lens for E-mount Video reviews:

Press release: Continue reading “Sigma announces 20mm F2 DG DN lens for E-mount”

Sigma 20mm f/2 DG DN Contemporary Lens Coming Soon

Sigma 20mm f/2 DG DN Contemporary Lens Coming on February 9th. Sigma will hold a new product announcement on February 9th at 21:00 JST, and it is highly likely that this new product will be the Sigma 20mm f/2 DG DN Contemporary Lens.

The Sigma 20mm f/2 DG DN Contemporary Lens will be designed for Sony full frame E mount cameras. Continue reading “Sigma 20mm f/2 DG DN Contemporary Lens Coming Soon”