Canon patent for curved sensor design (to suppress vignetting)

canon patent

Canon’s labs working on a curved sensor design? At least a new patent suggests it.

The patent refers to a curved sensor design with should suppress vignetting artefacts to a large degree.

  • Patent publication number 2016 – 197663
    • Release date 2016.11.24
    • Application date 2015.4.3
  • Canon patent
    • Make the central part flat in shape where light falloff is not noticeable
    • The surrounding portion where the drop in light quantity is conspicuous is defined as a curved shape

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Excerpt from the patent literature:

[Claim(s)] [Claim 1] It has an imaging surface which carries out light reception of the light from an object imaged with a lens,
An image sensor, wherein the aforementioned imaging surface has a flat shape part and a curved shape section.
[Claim 2] The image sensor according to claim 1 having made a central part of the aforementioned imaging surface into a flat shape part, and making a periphery of the aforementioned imaging surface into the aforementioned curved shape section.
[Claim 3] The image sensor according to claim 2, wherein a position of a boundary between said flat shape part and the aforementioned curved shape section is set as the same distance to one reference point on the aforementioned imaging surface.
[Claim 4] The image sensor according to claim 3, wherein the aforementioned imaging surface has a picture element region where a unit pixel is arranged at matrix form.
[Claim 5] The image sensor according to claim 4 which is provided with the following and characterized by the aforementioned valid pixel area comprising said flat shape part and an aforementioned curved shape section.
A valid pixel area which outputs a signal [ picture element region / aforementioned ] according to light income.
A black reference picture element region which outputs a black reference signal.

[Claim 6] The image sensor according to claim 5, wherein the aforementioned reference point is placed at the center of the aforementioned valid pixel area.
[Claim 7] The aforementioned black reference picture element region adjoins the aforementioned valid pixel area, and is arranged, and, in the aforementioned black reference picture element region, the part or whole serves as a curved shape section, The image sensor according to claim 5 or 6, wherein curvature of a curved shape section of the aforementioned black reference picture element region differs from curvature of a curved shape section of the aforementioned valid pixel area.
[Claim 8] The image sensor according to claim 7, wherein curvature of a curved shape section of the aforementioned black reference picture element region is smaller than curvature of a curved shape section of the aforementioned valid pixel area.
[Claim 9] An image sensor of a description in any 1 item of Claims 5-8, wherein the aforementioned black reference picture element region comprises a shaded unit pixel provided with a photoelectric conversion part.
[Claim 10] An image sensor of a description in any 1 item of Claims 5-8, wherein the aforementioned black reference picture element region comprises a unit pixel without a photoelectric conversion part.
[Claim 11] An image sensor of a description in any 1 item of Claims 1-10,
The aforementioned lens,
An imaging device characterized by preparation ******.
[Claim 12] The imaging device according to claim 11, wherein the aforementioned reference point is placed on an optic axis of the aforementioned lens.

[via Egami]

Canon release free EOS-1D X Mark II Auto-Focus Setting Guidebook

Canon Release Free EOS-1D X Mark II Auto-Focus Setting Guidebook

Canon EOS-1D X Mark II: Amazon | B&H Photo | Digitalrev | eBay | Adorama | Canon USA

At a glance:

  • 20.2MP Full-Frame CMOS Sensor
  • Dual DIGIC 6+ Image Processors
  • 3.2″ 1.62m-Dot Touchscreen LCD Monitor
  • DCI 4K Video at 60 fps, 8.8MP Still Grab
  • 61-Point High Density Reticular AF II
  • Native ISO 51200, Expanded to ISO 409600
  • 14 fps Shooting, 16 fps in Live View
  • Dual Pixel CMOS AF and Movie Servo AF
  • Built-In GPS, CFast & CF Card Slots

Canon Professional Network released the AF settings guidebook for their flagship, the Canon EOS-1D X Mark II.

The 148-page guidebook explains in detail the technical elements of the AF system and highlights other key functionalities that photographers need to know and understand in order to get the very best from Canon’s pro-series flagship, such as Movie Servo AF, using Auto ISO and much more.

In the guidebook are detailed overviews and explanations of the new AF algorithm and AI Servo AF III+ along with a list of the AF Configuration Tool and Presets, with comprehensive explanations on how each Case Setting works and when to choose them.

The guidebook is divided into six parts, consisting of two chapters on the AF Configuration Tool (Presets and Parameters), as well as chapters on AF area selection modes, 61-point reticular AF cross-type points, release property settings and anti-flicker shooting plus utilising the AF and Movie Servo AF and other useful functions.

Click here to download the AF settings guidebook.

Still Live: Canon EOS 5D Mark IV deal – $2,899 (reg. $3,499)

Still Live: Canon EOS 5D Mark IV Deal – $2,899 (reg. $3,499)

Top Rated Plus seller ElectronicsValley on eBay (99.7% positive ratings) has the new Canon EOS 5D Mark IV on sale at $2,899. Compare at $3.499. Free shipping. Please note: this is an import model, 1 year US seller warranty applies.

More Black Friday/Cyber Monday deals are listed here.

Canon releases firmware updates for many DLSRs because of issues with EF 70-300mm f/4-5.6 IS II and EF-S 18-135mm f/3.5-5.6 IS USM lenses

Canon Releases Firmware Updates For Many DLSRs Because Of Issues With EF 70-300mm F/4-5.6 IS II And EF-S 18-135mm F/3.5-5.6 IS USM Lenses

Canon released firmware updates for almost every DSLR released before 2015. It’s because many Canon DSLRs have issues with the EF 70-300mm f/4-5.6 IS II and EF-S 18-135mm f/3.5-5.6 IS USM lenses.

The firmware update…

Corrects a phenomenon in which when using the camera with the EF-S 18-135mm f/3.5-5.6 IS USM or EF 70-300mm f/4-5.6 IS II USM lens, even if lens aberration correction is set to “”Enable””, correction will not be applied.

To download the firmware update for your Canon DSLR, click here and then choose your Canon DSLR, and then follow instructions.

Thanks Lawrence.

Canon EF 16-35mm f/2.8L III vs Tamron SP 15-30mm f/2.8 VC video comparison

Canon EF 16-35mm F/2.8L III Vs Tamron SP 15-30mm F/2.8 VC Video Comparison

Canon EF 16-35mm f/2.8L III: Amazon | B&H Photo | Digitalrev | eBay | Adorama | Canon USA

At a glance:

  • EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/2.8 to 22
  • Three Aspherical & Two UD Elements
  • Subwavelength & Air Sphere Coatings
  • Ring-Type Ultrasonic Motor AF System
  • Internal Focus; Full-Time MF Override
  • Fluorine Coating on Exposed Elements
  • Dust- and Water-Resistant Construction
  • Rounded 9-Blade Diaphragm

Interesting lens comparison by reviewer and photographer Dustin Abbott. Dustin compares the Canon EF 16-35mm f/2.8L III with the Tamron SP 15-30mm f/2.8 VC, a lens that costs half the Canon. Is the Canon worth two times the price of the Tamron?

Tamron SP 15-30mm f/2.8

Tamron SP 15-30mm f/2.8 Di VC: Amazon | B&H Photo | Digitalrev | eBay | Adorama | Canon USA

Tamron SP 15-30mm f/2.8 at a glance:

  • EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/2.8 to 22
  • XGM and LD Glass Elements
  • Vibration Compensation
  • eBAND and BBAR Coatings
  • Fluorine Coating on Front Element
  • Ultrasonic Silent Drive AF System
  • Built-In Lens Hood
  • Rounded 9-Blade Diaphragm
  • SILKYPIX Developer Studio Software

Save Big on Datacolor Spyder5 calibration tools (B&H, today only)

Save Big On Datacolor Spyder5 Calibration Tools (B&H, Today Only)

Datacolor Spyder5Pro at a glance:

  • Calibrate Laptops, Desktop Monitors
  • Includes Color Probe
  • 16 Calibration Choices
  • 3 Ambient Light Settings
  • Before and After Evaluation
  • Basic Display Analysis
  • Comes in a Reusable Box / Case

B&H has a pretty good one day only promotion on Datacolor Spyder5 display calibration tools.