Latest Canon Patent Round-Up (Telephoto Primes, Defocus Smoothing, EOS R Lenses)

canon patent
View Post

Canon patent application in Japan 2019-032390 and 2019-032391 discuss optical formulas for various telephoto prime lenses:

Focal distance 294.00 
F number 2.91 
a half field angle (degree) — 4.21
image height 21.64 
Whole length of the lens 276.40 
BF 65.35 

Focal distance 392.00 
F number 2.90 
a half field angle (degree) — 3.16 
Image height 21.64 
Whole length of the lens 371.25 
BF 69.92

Focal distance 490.00 
F number 4.12 
a half field angle (degree) — 2.53 
Image height 21.64 
Whole length of the lens 410.77 
BF 66.03

Focal distance 588.00 
F number 4.12 
a half field angle (degree) — 2.11 
Image height 21.64 
Whole length of the lens 474.78 
BF 80.59

Focal distance 784.00 
F number 5.80 
a half field angle (degree) — 1.58 
Image height 21.64 
Whole length of the lens 484.53 
BF 75.94

Canon patent application in Japan (2019-028212) discusses another optical formula for an RF 70-300mm lens for the EOS R system:

focal length 71.53 132.28 293.70 
F-number 4.16 5.18 5.83 
half-field angle (degree) 16.83 9.29 4.21 
Image height 21.64 21.64 21.64 
Lens total length 179.52 216.99 250.81 
BF 48.94 22.62 18.05 

Canon patent application in Japan (2019-028258) discusses the optical formula for what might be kit lenses for an APS-C DSLR:

focal length 17.00 45.29 130.97
F number 3.71 5.63 6.30
half angle of view (degree) 38.78 16.78 5.95
image height 13.66 13.66 13.66
total lens length 88.79 109.43 136.79
BF Air) 9.50 32.69 41.15

focal length 17.00 48.75 130.97
F number 3.59 6.05 6.30
Half angle of view 38.78 15.65 5.95
Image height 13.66 13.66 13.66
Lens total length 93.09 114.59 143.09
BF 11.62 39.19 46.30

focal length 18.45 46.95 80.00
F number 3.25 4.48 5.60
Half angle of view 36.52 16.22 9.69
Image height 13.66 13.66 13.66
Lens total length 98.76 113.68 139.63
BF 9.45 9.45 9.45

focal length 17.00 44.95 130.97
F number 3.88 5.96 6.30
half angle of view (degree) 38.78 16.90 5.95
image height 13.66 13.66 13.66
total lens length 88.59 109.18 136.47
BF 11.16 34.60 41.37

focal length 18.14 30.19 45.00
F-number 2.06 3.00 5.00
half-field angle (degree) 33.66 23.99 16.62
Image height 12.08 13.43 13.43
total lens length 92.24 97.67 90.17
BF 13.96 9.90 3.00

Canon patent applications via Canon News.

Deal: Sigma 14-24mm f/2.8 DG HSM Art Lens – $929 (reg. $1299, today only)

Sigma 14-24mm f/2.8 DG HSM Art Kazuto Yamaki
View Post

Sigma 14-24mm f/2.8 DG HSM Art at a glance:

  • F-Mount Lens/Full-Frame Format
  • Aperture Range: f/2.8 to f/22
  • 3 FLD, 3 SLD, and 3 Aspherical Elements
  • Super Multi-Layer Coating
  • Hyper Sonic AF Motor, Manual Override
  • Weather-Sealed Brass Bayonet Mount
  • Rounded 9-Blade Diaphragm
  • Minimum Focus Distance: 10.2″

Only for today (2/28/19) B&H Photo has the Sigma 14-24mm f/2.8 DG HSM Art Lens on sale at $929. Free shipping. Nikon mount version also discounted.

More selected deals:

More hand-picked deals are listed here.

Authorised Canon retailer B&H Photo has discounted EOS 5D Mark IV and EOS 6D Mark II bundles on offer for the holidays.

We offer 10% discount to subscriptions to Pixpa all-in-one platform for photographers.

Today’s Gold Box and one day only deals at Amazon US, Amazon DE, Amazon UK, B&H Photo, eBay, Adorama.

Canon Europe stores have a cash back promotions going on:

Refurbished lenses and DSLRs at Canon Store (best deals to be found here)

Save $10 on Luminar 4 and/or Aurora HDR 2019 using our code “WATCH” at checkout.