Canon Patent: RF 300mm f/2.8 IS And RF 400mm f/2.8 IS

Canon Patent

And yet another Canon patent application: two telephoto fast primes for the RF mount.

Canon patent application 2023104022 (Japan, published 7/28/2023) discusses optical formulas for two fast telephoto prime lenses for the RF mount: RF 300mm f/2.8 IS and RF 400mm f/2.8 IS.

From the patent literature:

Optical System and Imaging Device Having the Same

Description of the Related Art

An optical system used in an imaging apparatus is required to be compact and lightweight as a whole, and to have high optical performance capable of satisfactorily correcting various aberrations including chromatic aberration. As a compact optical system, a so-called telephoto type optical system is known in which a lens group with positive refractive power is arranged on the object side and a lens group with negative refractive power is arranged on the image side. However, in the telephoto type optical system, the longer the focal length, the larger the entire system, and the use of a lens with a large diameter or a heavy lens tends to increase the weight of the entire optical system.

Example 1

  • Focal length: 294.99
  • F-value: 2.90
  • Half angle of view: 4.19
  • Image height: 21.64
  • Overall length: 280.25
  • Back focus: 37.47

Example 2

  • Focal length: 390.00
  • F-value: 2.90
  • Half angle of view: 3.18
  • Image height: 21.64
  • Overall length: 370.50
  • Back focus: 37.00

More Canon patents are listed here.

[via asobinet]

Canon Patent: RF 15mm f/2 And RF 12mm f/2.8 Lenses

Canon Patent

And here is another Canon patent application, for two RF mount lenses.

Canon patent application 023104029 (Japan, 7/28/2023) discusses optical formulas for two fast prime lenses for the RF mount: RF 15mm f/2 and RF 12mm f/2.8.

From the patent literature:

Optical System and Imaging Device Having the Same

A wide-angle lens is provided that is compact and lightweight, and provides a high optical performance in which fluctuations in aberration due to focusing are suppressed while a high photographing magnification can be obtained at the time of photographing at the shortest distance.

Description of the Related Art

In recent years, there has been a demand for wide-angle lenses used in imaging apparatuses that are compact as a whole and that are capable of obtaining a high photographing magnification at the time of photographing at the shortest distance. In addition, there is a demand for a lens having high optical performance in focusing from infinity to the closest object.

In a wide-angle lens, in order to obtain a high photographing magnification at the time of photographing at the shortest distance, it is necessary to increase the amount of movement of the focus lens group, which makes it difficult to reduce the size of the entire lens. In order to reduce the amount of movement of the focus lens group, it is necessary to increase the refractive power of the focus lens group.

[via asobinet]

Canon Patent For Built-In Tilting Viewfinder

Canon Patent

A new Canon Patent application describing a built-in tilting viewfinder which should also tale less space for implementation.

Canon patent application 2023104712 (Japan, published 7/28/2023) describes methods and technology for a tiltable viewfinder for an EOS R series camera body. From the patent literature:

[Title of the invention] Viewfinder unit, imaging device

Canon Inc. An object of the present invention is to suppress an increase in the size of an electronic device while securing a large rotation angle of a finder portion.

Description of the Related Art

Conventionally, a viewfinder unit provided in an electronic device such as an imaging device is known. For example, in an electronic device having a viewfinder unit such as an electronic viewfinder, the viewfinder unit is arranged on the upper part of the back side of the electronic device body. The finder section of the finder unit can be slid out from the main body of the electronic device, and the finder section can be tilted and rotated upward from the pulled out state, thereby increasing the degree of freedom in shooting posture.

However, in Patent Document 1, since the distance between the contact position of the pair of leaf springs with respect to the base plate and the rotation axis of the holder is long, the contact position moves so as to draw a large arc locus during rotation. . If the finder section rotates excessively, the leaf spring section will come off the fixed plate, so there is a restriction on the rotation angle of the finder section. On the other hand, if an attempt is made to design the rotation angle to be large, it is necessary to enlarge the fixing plate, which leads to an increase in the size of the imaging apparatus main body.

SUMMARY OF THE INVENTION

It is an object of the present invention to suppress an increase in the size of an electronic device while ensuring a large rotation angle of a viewfinder.

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

[via asobinet]

Canon R6 Mark II vs Sony a7 IV Comparison (video review)

EOS R6 Mark II Vs Sony A7 IV

Here is a Canon EOS R6 Mark II vs Sony a7 IV comparison review.

Sony a7 IV at a glance:

  • 33MP Full-Frame Exmor R CMOS Sensor
  • Up to 10 fps Shooting, ISO 100-51200
  • 4K 60p Video in 10-Bit, S-Cinetone
  • 3.68m-Dot EVF with 120 fps Refresh Rate
  • 3″ 1.03m-Dot Vari-Angle Touchscreen LCD
  • 759-Pt. Fast Hybrid AF, Real-time Eye AF
  • Focus Breathing Compensation
  • 5-Axis SteadyShot Image Stabilization
  • Creative Looks and Soft Skin Effect
  • 4K 15p UVC/UAC Streaming via USB Type-C

Canon EOS R6 Mark II at a glance:

  • 24.2MP Full-Frame CMOS Sensor
  • 4K60 10-Bit Internal Video, C-Log 3
  • External 6K ProRes RAW Recording
  • Dual Pixel CMOS AF II
  • 12 fps Mech. Shutter, 40 fps E. Shutter
  • Sensor-Shift 5-Axis Image Stabilization
  • 3.69m-Dot OLED EVF
  • 3″ 1.62m-Dot Vari-Angle Touchscreen LCD
  • Dual UHS-II Memory Card Slots
  • Multi-Function Shoe, Wi-Fi and Bluetooth

PetaPixel’s Chris is the host of the video comparison between the EOS R6 Mark II and the Sony a7 IV.

The Sony a7 IV and Canon R6 Mark II are two of the most well-rounded full-frame cameras on the market. Both are capable of outstanding photos and video, but in which areas do they excel? Art Of Photography host Ted Forbes joined us up in Calgary for a no-holds-barred camera throwdown!

For those who know what they want so see, here is the index of the video:

  • 0:00 – Intro
  • 2:14 – Handling
  • 4:17 – Image quality
  • 5:59 – Autofocus
  • 7:16 – Speed round!
  • 8:51 – Burst shooting
  • 9:52 – Video
  • 10:53 – Battery life
  • 11:26 – Lens lineup
  • 12:03 – The wrap

Canon Might Announce A New f/2 Zoom Lens For The RF Mount (in 2024)

Nab 2023 Canon Eos R5 Mark Ii Canon Eos R8 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

Canon might have a new f/2 lens on their release radar. That’s what a new rumor suggests.

Says the source of the rumor:

We have been told that Canon is planning a second RF mount f/2 zoom to “compliment” the remarkable RF 28-70mm f/2L USM, which is one of the best zoom lenses ever made.

The source didn’t know the focal length of the rumored lens, but did say to expect it some time in the first half of 2024.

Not much to rant about. Rumors that suggests release dates so far away in most cases are educated speculation, or wishful thinking. Nice for the rumor and fun community but to be taken with truckloads of salt.

Forget silly rumors, go out and take pictures.

Source: Canon Rumors

The Worst Thing About Canon (and other brand’s) Cameras, According To PetaPixel’s Chris

Canon

This is just for fun so do not take it seriously or start a war about it. What’s the worst in Canon cameras? And other cameras?

Chris of DPReview fame and now employed at PetaPixel, discusses what he believes is the worst of Sony, Nikon, Canon, Leica, and some other manufactures. He says:

Every camera company has an achilles heel that annoys Chris and he’s ready to dish. Here are the worst things about every camera company.

Curious? Just watch the video. Canon related rants start at minute 2:50.