Archive for: patent

Patent: EF 16-35 f/4L, 17-40 f/4L and Others

Patent: EF 16-35 f/4L, 17-40 f/4L and Others

A slew of patents showing various wide angle optical formulas has appeared. All of the lenses appear to be for full frame and could be hints of replacements for the EF 17-40 f/4L as well as the EF 16-35 f/2.8L II.

  • Patent Publication No. 2014-41245
    • Publication date 2014.3.6
    • Filing date 2012.8.22
  • Example 1
    • Focal length f = 16.49-23.55-33.95mm
    • Fno. 4.10
    • Half angle ω = 52.68-42.57-32.51 °
    • 14 pieces of 10-group lens configuration
  • Example 2
    • Focal length f = 17.50-25.45-38.90mm
    • Fno. 4.10
    • Half angle ω = 51.03-40.36-29.08 °
    • 15 pieces of 11-group lens configuration
  • Example 4
    • Focal length f = 17.50-24.82-38.89mm
    • Fno. 2.88-3.25-4.10
    • Half angle ω = 51.02-41.08-29.09 °
    • 15 pieces of 11-group lens configuration
  • Example 5
    • Focal length f = 16.50-25.34-34.00mm
    • Fno. 2.91
    • Half angle ω = 52.66-40.49-32.47 °
    • 15 pieces of 11-group lens configuration
  • Canon patents
    • 4-group zoom of positive and negative positive negative
    • Inner focus

Source: [EG]

Canon EF 17-40 f/4L | Canon EF 16-35 f/2.8L II

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Patent: EF-S 17-55 f/3.5-5.6 IS STM

Patent: EF-S 17-55 f/3.5-5.6 IS STM

Another lens patent has shown up today. This time an EF-S 17-55 f/3.5-5.6 IS STM. Perhaps it’ll be a new kit lens this year and will replace the current 18-55 IS STM. However, this may also be a hold over from last years kit lens update.

Description and self-interpretation of the patent literature

  • Patent Publication No. 2014-21258
    • Publication date 2014.2.3
    • Filing date 2012.7.18
  • Example 2
    • Zoom ratio 2.92
    • Focal length f = 18.50-32.89-54.00mm
    • Fno. 3.49-4.39-5.80
    • Half angle ω = 36.44-22.55-14.20 °
    • Image height Y = 13.66mm
    • 119.77-110.06-120.23mm overall length of the lens
    • BF 37.98-52.51-74.3mm
  • Example 3
    • Zoom ratio 3.09
    • Focal length f = 17.50-32.05-54.00mm
    • Fno. 3.47-4.38-5.80
    • Half angle ω = 37.97-23.08-14.20 °
    • Image height Y = 13.66mm
    • 119.55-108.81-118.68mm overall length of the lens
    • BF 36.59-51.53-73.93mm
  • Canon patents
    • 4-group zoom of positive and negative positive negative
    • Inner folder – Kas (Group 3)
    • The fourth lens unit can also be used for anti-vibration

Source: [EG]

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Patent: Canon Curved Aperture Diaphragm

Patent: Canon Curved Aperture Diaphragm

Here’s another patent filing picked up by egami:

(translated)
Patent Publication No. 2014-13363,2014-13365

  • Publication date 2014.1.23
  • Filing date 2012.6.6


  • Canon patents

  • The iris of the dome-shaped

  • If I’m reading this correctly, if the aperture follows the curvature of the glass you end up by saving some space which can lead to more compact lenses, if not for the M line, than perhaps we’ll see some smaller EF-S lenses.

    egami via [CW]

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    Patent: Canon 11-24mm f/4 Lens

    Patent: Canon 11-24mm f/4 Lens

    Egami has shown that Canon has filed a patent for an ultra-wide angle zoom:

    (Translated)

    Description and self-interpretation of the patent literature

    Patent Publication No. 2014-10286

  • Publication date 2014.1.20
  • Filing date 2012.6.29

  • Example 1

  • Zoom ratio 2.06
  • Focal length f = 11.30-18.00-23.30mm
  • Fno. 4.10
  • Half angle ω = 62.42-50.24-42.88mm
  • Image height Y = 21.64mm
  • 172.19-161.28-162.86mm overall length of the lens
  • BF 38.82-52.31-63.15mm

  • Canon users have been left out in this focal range for quite some time. With Nikon and their legendary 14-24mm f/2.8G ED and other third party offerings filling up the gap in the market. Can Canon produce an optically superior lens that also has such a shallow depth of field? Until they do, the only wide-angle zooms that Canon makes that come close are the 16-35 f/2.8 L II or the 8-15mm f/4L Fisheye.

    [Egami]

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    Patents: Canon 85mm f/1.8 IS, 100mm f/2 IS, 135 f/2.8 IS

    Patents: Canon 85mm f/1.8 IS, 100mm f/2 IS, 135 f/2.8 IS

    Patents with three popular telephoto lenses with the addition of image stabilization have shown up. It’s long been expected to see IS added to Canons highly regarded 135 f/2.0, I don’t know where a 2.8 will fit into the lineup, and adding stabilization to the 85 and 100 would follow with Canons current practice of sticking IS on all their mid-range glass.

    Patent Publication No. 2014-10283
    Publication date 2014.1.20
    Filing date 2012.6.29

    Example 1
    Focal length f = 85.56mm
    Fno. 1.86
    Angle of view 2ω = 28.4 °
    Image height Y = 21.635mm

    Example 2
    Focal length f = 102.06mm
    Fno. 2.00
    Angle of view 2ω = 23.9 °
    Image height Y = 21.635mm

    Example 3
    Focal length f = 131.00mm
    Fno. 2.80
    Angle of view 2ω = 18.8 °
    Image height Y = 21.635mm

    Canon patents
    Positive and negative positive
    Inner Focus (group 2)
    (Part of the third group) antivibration

    Source: [EG]

    Update: I accidentally read the135 f/2.8 as f/2.0, apologies for any potential false hope we brought.

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    Patent: EF-M 18-40 Pancake

    Patent: EF-M 18-40 Pancake

    A patent showing an EF-M 18-40  f/3.5-5.6 pancake has come to light. With this patent a bunch of other optical formulas also appear, such as an 18-55 pancake, 10-20, and a 9-18. We currently have an EF-M 11-22, which is probably rooted from the latter two optical formulas.

    A zoom pancake would be a nice addition to the geographically fragmented and oddly marketed EOS M line.

    • Patent Publication No. 2014-6275
      • Publication date 2014.1.16
      • Filing date 2012.6.21
    • Example 7
      • Zoom ratio 3.00
      • Focal length f = 18.10-37.01-54.30mm
      • Fno. 4.20-6.20-8.20
      • Half angle ω = 36.92-20.17-14.06 °
      • Image height Y = 13.60mm
      • 64.74-56.63-62.13mm lens length
      • BF 0.50mm
    • Canon patents
      • The possible vibration damping by the second lens group
      • Feeding whole, front focus, focusing, rear focusing, etc.

    Source: [EG]

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    Patent: Microadjustment Automated

    Patent: Microadjustment Automated

    A patent has been published outlining automatic microadjustment for Canon DSLRs and lenses. This would definitely be a handy feature going forward. Especially if you rent lenses.

    • Patent Publication No. 2013-254194
      • Publication date 2013.12.19
      • Filing date 2012.5.11
    • Issues surrounding the AF adjustment
      • The looseness of the phase difference AF sensor, because the AF accuracy is worse, need AF adjustment
      • It is not done correctly the AF adjustment in your environment
      • Necessary facilities such as service center
    • Canon patents
      • Automation of the AF adjustment
      • Procedure
        • Let me be the difference adjusted value of the phase difference AF and contrast AF
        • To determine the reliability

    Source: [EG]

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    Patent: 16-120mm f/3.5-5.6 IS STM

    Patent: 16-120mm f/3.5-5.6 IS STM

    The following patent is most likely for the EF-M range of lenses. Also appearing alongside the 16-120 IS STM in the patent is an 18-55 IS STM and an 18-200 f/3.5-6.3 IS STM.

    • Patent Publication No. 2013-257507
      • Publication date 2013.12.26
      • Filing date 2012.6.14
    • Example 1
      • Zoom ratio 2.87
      • Focal length f = 18.58 – 27.82 – 53.36mm
      • Fno 3.60 -. 4.27 – 5.69
      • Half angle ω = 36.33 – 26.15 – 14.36 °
      • Image height Y = 13.66mm
      • 86.23 – - 104.79mm 78.22 overall length of the lens
      • BF 0.50mm
      • 13 pieces of 11-group lens configuration
      • Three four-sided aspherical
    • Example 3
      • Zoom ratio 10.39
      • Focal length f = 18.60 – 60.12 – 193.23mm
      • Fno 3.55 -. 5.59 – 6.60
      • Half angle ω = 36.29 – 12.80 – 4.04 °
      • Image height Y = 13.66mm
      • 151.48 – - 184.39mm 118.58 overall length of the lens
      • BF 0.50mm
      • 18 pieces of 14-group lens configuration
      • Three three-sided aspherical
      • One UD glass
    • Example 4
      • Zoom ratio 7.14
      • 51.87 – - 117.70mm 16.48 focal length
      • Fno 3.60 -. 5.30 – 5.88
      • Half angle ω = 39.65 – 14.75 – 6.62 °
      • Image height Y = 13.66mm
      • 138.55 – - 162.35mm 114.75 overall length of the lens
      • BF 0.50mm
      • 17 pieces of 13-group lens configuration
      • Two two-sided aspherical
      • One UD glass
    • Canon patents
      • Vibration control
      • Inner focus

    Source: [EG]

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    Patent: Canon EF 300-600 f/5.6 w/1.4x TC

    Patent: Canon EF 300-600 f/5.6 w/1.4x TC

    Super telephoto patent
    A new Canon patent showing other lens formulas using a built-in 1.4x teleconverter. Two of the primary lenses are an EF 300-600 f/5.6L IS 1.4x and a 600 f/4L IS with a built in TC.

    The same patent also shows the EF 200-400 f/4L IS 1.4x TC. Perhaps Canon sees value in this setup for longer lenses? Here’s hoping so.

    Example 2

    • Focal length f = 585.10mm
    • Fno. 4.12
    • Half angle ω = 2.12 °
    • Image height Y = 21.64mm
    • The overall length of the lens 467.32mm
    • BF 83.15mm
    • Teleconference insertion
    • Focal length f = 819.00mm
    • Fno. 5.77
    • Half angle ω = 1.51 °

    Example 3

    • Zoom ratio 1.90
    • Focal length f = 307.50 – 585.00mm
    • Fno. 5.88
    • Half angle ω = 4.02 – 2.12 °
    • Image height Y = 21.64mm
    • The overall length of the lens 405.00mm
    • BF 75.70mm
    • Teleconference insertion
    • Focal length f = 427.00 – 812.33mm
    • Fno. 8.17
    • Half angle ω = 2.90 – 1.53 °

    Source: [EG]

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    Patent: A Pellicle Mirror by Canon

    Patent: A Pellicle Mirror by Canon

    Canon coming full circle
    A patent revealing a pellicle mirror by Canon has made its way to public eyes. It seems everyone is researching the technology. Canon did this a long time ago in the Pellix, F1 High Speed, EOS RT and EOS 1N RS.

    Patent Publication No. 2013-218241

    • Publication date 2013.10.24
    • Filing date 2012.4.12

    Canon patent

    • Pellicle mirror
    • The transmitted light image sensor in, I lead the OVF the reflected light
    • Reflectance (transmittance) variable
    • (Low transmittance) high set the reflectance OVF when, at the time of imaging is set (high transmittance) low reflectance

    Source: [EG]

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