Canon Patent For 1.4x Extender (Updated)

400

I made a big mistake reading the patent. Thanks to DicaHub I can correct it. The patent is not for a 400mm lens with built-in extender, but for a 1.4x extender for lenses that do not support contrast AF. With such lenses a “wobbling” effect can appear when shooting video. The patent refers to an extender with movable elements to suppress the “wobbling” effect.

Egami (translated) spotted another patent filed by Canon, this time for a 400mm lens with built-in 1.4x extender.

  • Patent Publication No. 2014-115410
    • Publication date 2014.6.26
    • Filing date 2012.12.7
  • Master lens
    • Focal length f = 390.09mm
    • Fno. 2.90
    • Half angle ω = 2.01 °
    • Image height Y = 13.66mm
    • The overall length of the lens 367.66mm
    • BF 44.00mm
    • 15 pieces of 11-group lens configuration
    • Two fluorite
  • Example 1
    • Focal length f =-226.69mm
    • 1.41x magnification
    • Five 4-group lens configuration
    • One piece of one sided aspherical

Today Only Hot Deal: Canon Rebel SL1 w/ 16GB and PIXMA Pro-100 – $383 (after MIR)

icasl1a

That’s a great deal Adorama put online, and it expires today, June 30.

Get the Canon Rebel SL1 with a 16GB SDHC memory card, a camera bag, and the Canon PIXMA PRO-100 Photo Printer – all for just $383 after $400 mail-in rebate. This is how it works:

Great deal, hurry up it’s just for today!

icapro100

Canon Patent for 1.03x Magnification Viewfinder

Canon Patent

Egami (translated) spotted a patent filed by Canon for a 1.03x magnification viewfinder. Do not think this patent has something to do with the upcoming EOS 7D replacement, since I doubt Canon would disclose related informations short before the announcement.

  • Patent Publication No. 2014-115451
    • Publication date 2014.6.26
    • Filing date 2012.12.10
  • Example 9
    • -3 -1 +1 Viewfinder diopter
    • Focal length f = 46.84 48.38 49.99mm
    • Eye point 22.00mm
    • 1.03 1.03 1.02x magnification
    • Pentagonal prism
    • Condenser lens made of glass
    • Eyepiece lens system with the exception of the condenser lens, 4-group structure of the positive and negative positive negative
    • In turn, resin (single-sided aspherical surface), glass, resin (single-sided aspherical surface), the material is glass
  • Patent Publication No. 2014-115452
    • Publication date 2014.6.26
    • Filing date 2012.12.20
  • Example 1
    • -3.00 -1.00 +1.00 Diopter
    • Focal length f = 62.22 59.69 57.39mm
    • Eye Relief 19.9mm
    • Maximum image height 12.4mm
    • Pupil diameter φ15mm
    • Magnification 0.87x
    • Pentagonal mirror