Canon Patent: 200mm f/2, 300mm f/2.8 And 500mm f/4 (RF mount?)

Canon Patent

Canon patent application for some telephoto zooms, for the EOS R system I guess.

Canon patent application 2020196094 (Japan) discusses optical formulas for three telephoto zoom lenses:

  • 200mm f/2
  • 300mm f/2.8
  • 500mm f/4

As a shooting optical system having a long focal length, a so-called telephoto type shooting optical system is known. The telephoto type photographic optical system is used, for example, in a single focus super-telephoto lens.

In the photographing optical system described in Patent Document 1, the second lens group having a negative refractive power is moved during focusing. Here, the second lens group is arranged at a position relatively close to the first lens group, and it cannot be said that the focus group can be sufficiently reduced in size and weight.

An object of the present invention is to provide an optical system that is lightweight and has chromatic aberration and other aberrations satisfactorily corrected, and an image pickup apparatus having the same.

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

[via Digicame Info]

Canon Patent: 400mm f/2.8, 500mm f/4 & 600mm f/4 For The EOS R System

Canon Patent

Ready for the start of the week, here is a new Canon patent application for RF mount lenses.

A new Canon patent application discusses optical formulas for three RF mount lenses:

  • 400mm f/2.8
  • 500mm f/4
  • 600mm f/4

PROBLEM TO BE SOLVED: To obtain an optical system which is lightweight and has chromatic aberration and other aberrations satisfactorily corrected.

Example 1

  • Focal length: 392.00
  • F value: 2.90
  • Half angle of view: 3.16
  • Image height: 21.64
  • Overall length: 360.03
  • Back focus: 31.01

Example 2

  • Focal length: 490.00
  • F value: 4.12
  • Half angle of view: 2.53
  • Image height: 21.64
  • Overall length: 412.08
  • Back focus: 33.39

Example 3

  • Focal length: 588.00
  • F value: 4.12
  • Half angle of view: 2.11
  • Image height: 21.64
  • Overall length: 476.08
  • Back focus: 33.21

This patent application might indeed lead to lenses that will be on sale one day.

The Canon patent application was spotted by asobinet. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

More Big White Telephoto Lenses Coming To The Canon EOS R System, Next Year

Telephoto

No surprise that after the leaks of the last days more telephoto lenses for the RF mount are rumored. Nothing to expect for this year, though.

Canon might be set to release an RF 300mm f/2.8L IS and an RF 500mm f/4L IS lens in 2021. Canon is migrating more and more of their EF lenses to the RF mount.

The RF 300mm f/2.8L IS and an RF 500mm f/4L IS are said to be much lighter and also shorter than their EF mount counterparts. A 300mm f/2.8L IS zoom might also be in the works.

Source: Canon Rumors

Sigma 500mm F/4 OS Sport Review (a unique lens, D. Abbott)

Sigma 500mm

Sigma 500mm F/4 OS Sport at a glance:

  • EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/4 to 32
  • One SLD and Two FLD Elements
  • Super Multi-Layer Coating
  • Hyper Sonic AF Motor, Manual Override
  • Optical Stabilizer; Drop-In Filter Slot
  • Magensium-Alloy Barrel & Brass Mount
  • Dust- and Splash-Proof Construction
  • Rotatable Tripod Collar with Click Stops
  • Compatible with Sigma Teleconverters

Dustin Abbott completed his exhaustive review of the Sigma 500mm F/4 OS Sport lens.

From his conclusion:

The Sigma 500mm F/4 OS HSM Sport is a unique lens.  It’s a third party option competing in a space dominated by first party lenses.  It’s an expensive lens that doubles as a relative value. 

[…]

The size, weight, and expense of a lens like the 500S makes it clear that it isn’t for everyone.  Lenses like this take a lot of skill to use well (and strength, too, if you try to handhold it).  A lens like the Sigma 60-600mm OS Sport is going to be more affordable and versatile, and, if you have a tight budget, a lens like the Sigma 150-600mm OS C can give you some incredible images for under a thousand bucks.  But there’s no question that the 500S gives you a different kind of versatility.  The ability to shoot in more lighting situations with both better autofocus performance and image quality.  The ability to get incredible subject isolation.  And, when adding teleconverters to the mix, an incredible amount of reach while retaining autofocus ability. 

The whole review is available as video review.

D. Abbott’s review comes with a rich set of test shots and discusses every aspect of the Sigma 500mm F/4 OS Sport lens. If you’re looking for this lens we recommend you have a look at Dustin Abbott’s review.

Sigma 500mm F/4 OS Sport:

America: B&H Photo, Adorama, Amazon USA, Amazon Canada, Canon Canada, Canon USA
Europe & UK: Amazon DE, Amazon UK, Amazon IT, Wex Photo Video, Canon DE, Canon UK

Canon Patent For 400mm F2.8, 500mm F4 and 600mm F4 Lenses For EOS R Mirrorless System

Canon Patent

Hi Lows Note spotted a Canon patent application (2019-95525, Japan) which describes optical formulas for telephoto lenses for the Canon EOS R full frame mirrorless system.

The optical formulas are for 400mm f2.8, 500mm f4 and 600mm f4 lenses.

Focal length: 392mm
FNo.: 2.90
2ω: 3.16
Image height: 21.64 mm
Lens length: 360.03 mm
Back focus: 31.01 mm

Focal length: 490mm
FNo.: 4.12
2ω: 2.54
Image height: 21.64 mm
Lens length: 412.08 mm
Back focus: 33.39 mm

Focal length: 588mm
FNo.: 4.12
2ω: 2.11
Image height: 21.64 mm
Lens length: 476.08 mm
Back focus: 33.21 mm

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

First Supertelephoto Lens for the Canon EOS R System Might Be the RF 500mm f/4L IS

Canon Eos R

Rumor has it that the first super telephoto lens for the Canon EOS R system could be the RF 500mm f/4L IS.

No announcement date or specifications so far. However, there is a Canon patent application (US 20190155003) with describes the optical formulas for various super telephoto lenses for the EOS R system, among them a 500mm f/4L:

  • Focal length: 490.00
  • F value: 4.12
  • Angle of view: 2.53
  • Image height: 21.64
  • Lens length 412.08 
  • Backfocus: 33.39

The rumor might have some validity. When Canon will announce a mirrorless alternative to the Canon EOS-1D X series, then they likely will/could also announce this telephoto lens. But it’s a long way to go in opinion. The next Canon EOS R camera will most likely be a high resolution model.

Stay tuned.

Source: Canon Rumors