Canon Patent: 50mm f/4 IS Macro And 90mm f/4 IS Macro

Canon Patent

Canon patent application 2024010559 (Japan, published 01/24/2024) discusses optical formulas for two macro lenses for the RF mount:

  • 50mm f/4 IS Macro
  • 90mm f/4 IS Macro

From the patent literature:

  • An object of the present invention is to provide a compact and high-performance optical system in a macro lens, in which a focus lens group is made lighter and smaller, achieving higher focus stop precision and faster focusing speed.
  • BACKGROUND ART
    A macro lens is known as a lens capable of close-up photography. In recent years, there has been a demand for a macro lens that has high optical performance with little aberration variation in the entire focus region.
  • Patent Documents 1 and 2 disclose macro lenses that correct aberration fluctuations during focusing by moving a large focus lens group during focusing.
  • However, in the macro lenses described in Patent Documents 1 and 2, the actuator becomes large in order to move a large focus lens group, and the focus lens group becomes large, resulting in a decrease in focus stop accuracy and focus speed. There was a problem.
  • The present invention provides a compact and high-performance optical system in a macro lens by reducing the weight and size of the focus lens group, achieving high focus stop precision and high speed focusing speed.

Example 1

  • Focal length: 111.29
  • F value: 4.12
  • Half angle of view: 11.00
  • Image height: 21.64
  • Total length: 125.00
  • Back focus: 34.03
  • Magnification: 1.0

Example 2

  • Focal length: 90.00
  • F value: 4.12
  • Half angle of view: 13.52
  • Image height: 21.64
  • Total length: 120.00
  • Back focus: 21.58
  • Magnification: 1.0

Example 3

  • Focal length: 110.00
  • F value: 4.12
  • Half angle of view: 11.13
  • Image height: 21.64
  • Total length: 119.99
  • Back focus: 43.07
  • Magnification: 0.5

Example 4

  • Focal length: 52.00
  • F value: 4.12
  • Half angle of view: 22.59
  • Image height: 21.64
  • Total length: 115.00
  • Back focus: 24.18
  • Magnification: 1.0

Canon Patent: 24mm F1.4, 35mm F1.4 And 50mm F1.4

Canon Patent

And yet another Canon patent application. Fast primes for the RF mount.

Canon patent application 2022024113 (japan, published 8/30/2023) discusses optical formulas for three fast prime lenses:

  • 24mm F1.4
  • 35mm F1.4
  • 50mm F1.4

From the patent literature:

Optical system and imaging device

A compact optical system capable of high-speed focusing with a wide angle of view and a large aperture ratio is provided.

Description of the Related Art

Imaging devices using solid-state imaging devices such as CCD sensors and CMOS sensors are required to have optical systems that have a wide angle of view, a large aperture ratio, a small size, and high optical performance. There is also a demand for high-speed autofocus in the optical system.

An optical system with a wide angle of view and a large aperture ratio has the problem that it is difficult to correct various aberrations. In particular, if the weight of the focus lens group is reduced in order to perform high-speed focusing (autofocus), it becomes difficult to suppress aberration fluctuations in focusing from an object at infinity to a close object.

According to the present invention, it is possible to provide a compact optical system capable of high-speed focusing while having a wide angle of view and a large aperture ratio.

Example 1 (24mm F1.4)

  • Focal length 24.36
  • F value 1.44
  • Half angle of view 41.61
  • Image height 21.64
  • Lens length 106.56
  • Back focus 12.72

Example 2 (35mm F1.4)

  • Focal length 34.09
  • F value 1.45
  • Half angle of view 32.40
  • Image height 21.64
  • Lens length 113.84
  • Back focus 13.67

Example 3 (50mm F1.4)

  • Focal length 48.50
  • F value 1.45
  • Half angle of view 24.04
  • Image height 21.64
  • Lens length 108.70
  • Back focus 11.47

More Canon patents are listed here.

[via Digicame Info]

Canon Recalls Some Batches Of EOS R10 Cameras And EF 50mm F1.2 Lenses

Canon Eos R10 Review

Canon Japan published a customer advice about some batches of Canon EOS R10 cameras and EF 50mm f/1.2L lenses.

Canon found the following issue with Canon EOS R10 cameras:

A small part of this product makes a loud noise […] when the built-in strobe fires.

Is your Canon EOS R10 part of this batch? Find out this way:

[EOS R10 cameras] with the serial number (on the bottom of the camera) of which the two digits from the left are “01” to “10”.

(For products sold in Japan, some products from “01” to “03” are eligible.)

See here to learn more…

CANON EF 50mm f/1.2L

Some units of the Canon EF 50mm f/1.2L lens might have this issue:

When shooting in a high temperature environment, the exposure may not be as intended, resulting in variations in the brightness of the images shot in the same scene, or an error “Err01” may occur.

How to find out if your lens is affected? Check the serial number. Canon states:

Some of the EF50mm F1.2L USM interchangeable lenses for single-lens reflex and mirrorless cameras produced in 2022.

Lenses with the 10-digit serial number printed on the lens body (see the figure on the right) whose four digits from the left are “1840”, “1940”, “2040”, “2140”, and “2240” are eligible.

See here to learn more…

[via asobinet]

Today Only: Lensbaby Fixed Body with Creative Bokeh Optic for Canon EF & RF – $99.95 (reg. $199.95)

Creative Bokeh Optic

Only for today (3/22/2023) B&H Photo has a $100 discount on the Lensbaby Fixed Body with Creative Bokeh Optic for Canon EF and RF mounts.

At a glance:

  • EF/RF-Mount Lens/Full-Frame Format
  • 50mm Selective Focus Optic
  • Aperture Range: f/2.5 to f/22
  • Lensbaby Optic Swap System
  • Produces Sweet Spot of Focus
  • 9 Creative Aperture Disks
  • Minimum Focusing Distance: 1.25′
  • 12-Blade Diaphragm

Get the Lensbaby Fixed Body with Creative Bokeh Optic for Canon EF and RF mounts at $99.95. Compare at $199.95.

Learn more about the lens in the short video below.

More selected deals:

Click here to open the rest of the article

Cosina Will Soon Announce A Nokton 50mm f/1 For The RF Mount

NOKTON 50mm F/1

Good news for those looking to an ultra-fast prime lens for the EOS R camera system. A NOKTON 50mm f/1 aspherical lens is coming.

Cosina will soon release a NOKTON RF 50mm f/1 aspherical lens, along with other new prime lenses. Indeed, we expect 5 new lenses, these:

  • NOKTON 50mm F1 Aspherical RF-mount
  • NOKTON 35mm F0.9 Aspherical X-mount
  • NOKTON 55mm F1.2 SLIIs
  • ULTRON 27mm F2 X-mount Black
  • ULTRON 27mm F2 X-mount Silver

Here are the specifications for the NOKTON 50mm f/1 (thanks Mistral75):

Focal length50mm
Maximum aperture1:1
Minimum apertureF16
Lens configuration7 groups 9 elements
Angle of view48.0°
Number of diaphragm blades12
Shortest shooting distance0.45m
Maximum shooting magnification1:6.9
Maximum diameter x total lengthΦ79.3×64.0mm
Filter sizeΦ67mm
Weight650g
Lens hoodDedicated screw-in hood included
Aperture ringEquipped (manual aperture)
Electronic contactsAvailable
Exif informationCorrespondence
OtherSelective Aperture Control System

No specifications so far. All we know for the time being is that the new Cosina lenses will have electrical contacts to communicate with the camera. Moreover, a mechanical system is used for aperture interlocking, and an aperture switching mechanism for moving images is also present.

All upcoming Cosina lenses pictured below, click to enlarge.

[via Digicame-Info]