Canon Patent: 400mm F4, 500mm F5.6, And 800mm F6.3

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Here is a new Canon patent application.

Canon patent application 2024163673 (Japan, published 11/22/2024) discusses optical formulas for three telephoto lenses:

  • 400mm F4
  • 500mm F5.6
  • 800mm F6.3

From the patent literature:

  • A compact optical system is provided that has a sufficient aperture ratio and can effectively correct various aberrations.
  • Background Art: As a small telephoto lens, an optical system has been disclosed that has a first lens group with positive refractive power, a second lens group with negative refractive power that moves during focusing, and a third lens group with positive refractive power, which are arranged in order from the object side to the image side. In addition, as an optical system advantageous for video shooting and dustproofing and drip-proofing, an optical system employing an inner focus method or a rear focus method in which focusing is performed by moving a lens group on the image side rather than the first lens group, which is the closest to the object side, has been disclosed. These optical systems have good correction of various aberrations such as spherical aberration and chromatic aberration. In addition, the optical system may have an anti-vibration function for reducing (correcting) image blur caused by camera shake such as hand shake. Furthermore, these optical systems are also required to have a large aperture ratio and high optical performance.

Example 1

  • Focal length: 388.73
  • F-number: 4.08
  • Half angle of view: 3.19
  • Image height: 21.64
  • Total length: 310.74
  • Back Focus: 55.06

Example 2

  • Focal length: 479.13
  • F-number: 5.65
  • Half angle of view: 2.59
  • Image height: 21.64
  • Total length: 331.00
  • Back focal length: 55.35

Example 3

  • Focal length: 583.80
  • F-number: 5.65
  • Half angle of view: 2.12
  • Image height: 21.64
  • Total length: 366.23
  • Back focal length: 67.52

Example 4

  • Focal length: 584.06
  • F-number: 6.40
  • Half angle of view: 2.12
  • Image height: 21.64
  • Total length: 366.13
  • Back Focus: 69.91

Example 5

  • Focal length: 789.38
  • F-number: 6.40
  • Half angle of view: 1.57
  • Image height: 21.64
  • Overall length: 600.18
  • Back Focus: 62.06

More Canon patents are listed here.

[via asobinet]

Black Friday: Get Topaz Labs Photo AI Starter Kit at $199 (reg. $399)

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Topaz Labs has a rather good deal on their award winning Photo Ai software.

You can get the Photo AI starter kit on Black Friday sale at $199. Compare at $399.

Save on Photo AI 3 + 800 Cloud Credits to use when Cloud Render is available in the coming week. Soon, you can use credits for even faster image enhancements through our powerful, secure server. Your Cloud Credits will allow you to enhance images with the latest AI models at peak performance. It’s up to you: Run Photo AI 3 in the cloud when it’s available, or run it locally.

More Black Friday deals are listed here:

More deals to come…

Canon Patent: 400mm F4, 500mm F5.6, and 800mm F6.3

canon patent
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Here is anew Canon patent application for three telephoto lenses.

Canon patent application 2024163673 (Japan, published 11/22/2024) discusses optical formulas for three telephoto lenses:

  • 400mm F4
  • 500mm F5.6
  • 800mm F6.3

From the patent literature:

  • A compact optical system is provided that has a sufficient aperture ratio and can effectively correct various aberrations.
  • Background Art: As a small telephoto lens, an optical system has been disclosed that has a first lens group with positive refractive power, a second lens group with negative refractive power that moves during focusing, and a third lens group with positive refractive power, which are arranged in order from the object side to the image side. In addition, as an optical system advantageous for video shooting and dustproofing and drip-proofing, an optical system employing an inner focus method or a rear focus method in which focusing is performed by moving a lens group on the image side rather than the first lens group, which is the closest to the object side, has been disclosed. These optical systems have good correction of various aberrations such as spherical aberration and chromatic aberration. In addition, the optical system may have an anti-vibration function for reducing (correcting) image blur caused by camera shake such as hand shake. Furthermore, these optical systems are also required to have a large aperture ratio and high optical performance.

Example 1

  • Focal length: 388.73
  • F-number: 4.08
  • Half angle of view: 3.19
  • Image height: 21.64
  • Total length: 310.74
  • Back Focus: 55.06

Example 2

  • Focal length: 479.13
  • F-number: 5.65
  • Half angle of view: 2.59
  • Image height: 21.64
  • Total length: 331.00
  • Back focal length: 55.35

Example 3

  • Focal length: 583.80
  • F-number: 5.65
  • Half angle of view: 2.12
  • Image height: 21.64
  • Total length: 366.23
  • Back focal length: 67.52

Example 4

  • Focal length: 584.06
  • F-number: 6.40
  • Half angle of view: 2.12
  • Image height: 21.64
  • Total length: 366.13
  • Back Focus: 69.91

Example 5

  • Focal length: 789.38
  • F-number: 6.40
  • Half angle of view: 1.57
  • Image height: 21.64
  • Overall length: 600.18
  • Back Focus: 62.06

More Canon patents are listed here.

[via asobinet]

Hot Deal: Topaz Labs Bundle Deal at $299 (54% off, Photo AI 3, Video AI 5, Gigapixel 8)

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It’s Black Friday time and the first serious deals start to show up. We will try to select the best deals for you.

Topaz Labs has a bundle with their award winning software Photo AI 3, Video AI 5 and Gigapixel 8 on sale at $299, compare to $647 (that’s 54% off). If you are out for a comprehensive and AI-powered Photo and Video editing software, then have a look at this bundle.

More selected deals:

Canon Patent: 24-130mm F4 IS and 24-80mm F2.8 IS

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Here is a new Canon patent application for two zoom lenses.

Canon patent application 2024160458 (Japan, published 11/14/2024) discusses optical formulas for two zoom lenses:

  • 24-130mm F4 IS
  • 24-80mm F2.8 IS

From the patent literature:

  • To obtain a compact zoom lens having a bright F-number, a high zoom ratio, and high optical performance.
  • Background Art: Zoom lenses used in imaging devices such as those described above are required to have high performance with minimal aberrations and high resolution up to high spatial frequencies. In such zoom lenses, the degradation of optical characteristics due to diffraction cannot be ignored. Since the degradation of imaging performance due to diffraction is determined by the F-number of the zoom lens, zoom lenses are required to have a bright open F-number (large aperture ratio). Also, in order to reduce noise when imaging in dark places, a bright F-number is required throughout the entire zoom range. Furthermore, zoom lenses are required to be compact and to have a high zoom ratio.

Example 1

  • Focal length: 24.72-130.99
  • F-number: 4.08-4.12
  • Half angle of view: 37.84-9.38
  • Image height: 19.20-21.64
  • Total length: 127.91-182.91
  • Back focus: 11.19-47.32

Example 2

  • Focal length: 24.72-82.44
  • F-number: 2.88-2.91
  • Half angle of view: 37.91-14.71
  • Image height: 19.25-21.64
  • Total length: 141.91-178.40
  • Back focus: 12.29-33.22

More Canon patents are listed here.

[via asobinet]