Canon Patent: RF 100mm f/1.4, RF 85mm f/1.4 And More Prime Lenses

Canon Patent

Here is a new Canon patent, the first of four that have been published today.

Canon patent application 2023099386 (Japan, published 7/13/2023) discusses optical formulas for a bunch of fast prime lenses.

From the patent literature:

To provide an optical system capable of satisfactorily correcting aberrations over a wide range of object distances while achieving miniaturization of a focus lens group.

Description of the Related Art

In recent years, an optical system used in an imaging apparatus has achieved a reduction in the size of the entire lens diameter of a focus lens group. It is required to be able to satisfactorily correct surface curvature and the like. As an optical system that satisfies these requirements, Patent Document 1 discloses a positive refractive power first lens group, a negative refractive power focus lens group, and a positive refractive power lens group, which are arranged in order from the object side to the image side. is disclosed having a focus lens group of .
However, in the optical system described in Patent Document 1, when the aperture of the optical system is increased, the focal length of the focus lens group having a positive refractive power and the second optical system arranged on the image side of the focus lens group The focal length of the 4 lens group is not properly set. For this reason, in the optical system described in Patent Document 1, it is difficult to suppress aberration fluctuations during focusing when the optical system has a large aperture.

SUMMARY OF THE INVENTION

The present invention provides an optical system capable of satisfactorily correcting aberrations over a wide range of object distances while achieving a compact focus lens group.

Example 1

  • Focal length: 82.50
  • F-value: 1.46
  • Half angle of view: 14.69
  • Image height: 21.64
  • Overall length: 112.50
  • Back focus: 13.00

Example 2

  • Focal length: 72.10
  • F-value: 1.46
  • Half angle of view: 16.70
  • Image height: 21.64
  • Overall length: 108.50
  • Back focus: 12.99

Example 3

  • Focal length: 97.50
  • F-value: 1.46
  • Half angle of view: 12.51
  • Image height: 21.64
  • Overall length: 125.50
  • Back focus: 13.00

Example 4

  • Focal length: 82.50
  • F-value: 1.24
  • Half angle of view: 14.69
  • Image height: 21.64
  • Overall length: 135.50
  • Back focus: 15.03

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via asobinet]

The Canon EOS R1 Might Have A New Kind Of EVF

Nab 2023 Canon Eos R5 Mark Ii Canon Eos R8 CP+ 2024 Mark Ii Canon EOS Rf 24-50mm R6 Mark Ii Rf Mount Eos R6 Mark Ii Rf 300mm Rf 35mm Canon Eos R100 Rf 24mm F/1.8 Rf-s Canon Eos R7 Eos R100 Canon High Resolution Eos R R10 Eos C5 Canon Canon Eos R1 Eos R5c Canon Rf 16mm Rf 35mm F/1.2L EF Lenses Tilt-shift Lenses Rumor

A new rumor surfaced, and it is about the Canon EOS R1. Nothing to write home about, though, and no reason to take it without a massive amount of salt.

Besides suggesting the EOS R1 will launch in 2024 (yes, now it is 2024), the source of the rumor suggests the Electronic View Finder of the EOS R1 might have these specifications:

  • 7.x million dots
  • 0.7 inch OLED
  • 60 – 240hz refresh rate
  • Variable refresh rate possible
  • 4000nit brightness
  • Blackout free

All good and nice, and maybe also some educated speculation. As I told many times before, rumor sites know nothing, they just speculate. The only ones who leak serious stuff are a handful of Japanese sites.

Forget rumors, enjoy life and snap pictures.

[via camera insider]

Nikon Z 8 vs Sony a7R V, A Battle of Mirrorless ALL-STARS?

Nikon Z 8

DPReview’s Chris, now employed at PetaPixel, posted a video where he compares the Nikon Z 8 with the Sony a7R V. Mirrorless all-stars? I doubt so.

Chris seems to have forgotten Canon’s rich offering on mirrorless cameras. While the Nikon Z 8 is a great camera (and the Sony seems to be too), we have an EOS R5 and EOS R3. Not all-stars? Enjoy the video.

Canon Patent: AF-Motor With Reduced Size And Lower Power Consumption

Canon Patent

A new Canon Patent application.

Canon patent application 2023096628 (Japan, published 7/7/2023) discusses technology and methods for a autofocus-driving motor with reduced size and lower power consumption.

The motor described in the the patent literature is a “linear motor”. Canon interchangeable lenses have a “ring-type USM”-motor for single-lens reflex cameras and a “NanoUSM”-motor for mirrorless cameras. Both are driven by ultrasonic waves, so this would be a new kind of motor driving Canon lenses.

From the patent literature:

A linear motor, a lens barrel, and a driving device that can improve power efficiency while suppressing an increase in external size are provided. BACKGROUND ART A linear motor is a motor that mainly generates force in one direction

It is used in a wide range of industrial fields. Linear motors are often used exclusively in linear drive applications and are often used in combination with linear guide mechanisms. Linear motors are classified into electromagnetic, pressure, friction, and tension/extrusion types according to the principle of thrust generation, and into finite tracks, endless tracks, etc. according to the drive range. be. In addition, devices that use mechanisms such as so-called rack and pinions and tires to convert the thrust of a normal rotary motor into linear thrust are also broadly classified as linear motors (linear actuators).

An example of the use of a linear motor is a focusing mechanism in a lens barrel. In the lens barrel, the focus operation is performed by moving the focus lens group inside the lens barrel back and forth on the optical axis perpendicular to the camera’s image sensor in order to focus on the subject at the desired position when shooting. is done. A linear motor is used to adjust the movement of the focus lens group.

Necessary conditions for the linear motor used in the focus mechanism in the lens barrel are that it has a size that fits inside the lens barrel, and that the maximum output and resolution of the thrust force sufficient to move and adjust the focus lens group are required. Being prepared, being quiet, etc. To meet these conditions, among the above categories, electromagnetic linear motors with finite trajectories are used, especially voice coil motors (VCMs), which generate the Lorentz force through a combination of permanent magnets and coils. may occur.

Since the VCM does not generate thrust when it is not energized, when using the VCM as a focus mechanism in the lens barrel, it is necessary to always energize the VCM to hold the focus lens group during use. For this reason, depending on the shooting scene, it may consume a large amount of power and the battery of the camera will be consumed faster than when using other friction type ultrasonic motors for the focusing mechanism in the lens barrel. be. Therefore, when a VCM is used as a focusing mechanism in the lens barrel, it is required to improve the power efficiency of the VCM.

In order to improve the power efficiency of a VCM with a finite orbit without increasing the external size, the efficiency of a magnetic circuit composed of a permanent magnet and a yoke (hereinafter simply referred to as magnetic efficiency), that is, the coil area of ​​the VCM The key is how to increase the density of the magnetic flux that contributes to the generation of thrust. The magnetic circuit here is an expression that compares the flow of magnetic flux in space to the flow of current in a circuit, and indicates the direction and magnitude of the magnetic flux density at each point. itself is also shown. In addition, in general finite orbit VCM, it is known that the magnetic efficiency is relatively lower at both ends of the drive stroke than at the center, and it is important in practice to suppress this. (See, for example, Patent Document 1).

However, in the VCM of Patent Document 1, since the magnetic efficiency in the central portion of the driving stroke is reduced in order to equalize the magnetic efficiency in the driving stroke, there is a problem that the power efficiency as a whole deteriorates. In addition, since the configuration of Patent Document 2 requires a separate fixing means for fixing the magnet, there is a problem that the external size of the linear motor tends to increase.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a linear motor, a lens barrel, and a driving device that can improve power efficiency while suppressing an increase in external size.

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via asobinet]

Today Only: Lensbaby Fixed Body with Fisheye Optic (RF & EF) – $125 (reg. $200)

Fisheye

Only for today (7/6/2023) B&H Photo has a $75 discount on the Lensbaby Fixed Body with Fisheye Optic for Canon EF and RF mounts.

At a glance:

  • 12mm Fisheye Lens
  • Manual Focus

Offering an expansive ultrawide-angle perspective, the Lensbaby Fixed Body with Fisheye Optic is a unique almost-circular fisheye lens for Canon RF-mount cameras. It offers a spacious angle of view, a distinct fisheye look, and provides a vast depth of field for creating memorable and dynamic imagery with a distorted and slightly cropped perspective on the top and bottom of the image.

Get the Lensbaby Fixed Body with Fisheye Optic on sale at $125:

More selected deals:

First Canon EOS R5 Mark II Bodies Undergoing Testing In The Wild?

It’s along running rumor, but we can sure the EOS R5 Mark II will be released, sooner or later.

Latest murmurings has it that Canon might already test the EOS R5 Mark II with selected photographers. The rumor originated from the YouTube channel of Ordinary Filmmaker. I wouldn’t rate it as very reliable. On the other hand, rumors that go on since such long time have a high probability to become reality, sooner or later. For the mere simple fact that there will be a successor to the EOS R5.

According to the rumor in the video below, Canon put EOS R5 Mark II bodies into the hands of content creators, videographers, and photographers. Basically everyone who might need a camera to get things done. According to the rumor, the EOS R5 Mark II might be released in Q4 2023. Time will tell.