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March 3, 2014
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Posted in patents

Canon Patent For 600mm f/4 Lens

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Canon Patent

Egami (translated) spotted a patent filed by Canon for a new 600mm f/4 lens. Egami suggests the lens will be ready for Tokyo Olympic Games in 2020 and the Rio de Janeiro Olympic Games in 2016.

  • Patent Publication No. 2014-26210
    • Publication date 2014.2.6
    • Filing date 2012.7.30
  • Example 1
    • Focal length f = 588mm
    • Fno. 4.12
    • Angle of view 2ω = 4.22 °
    • BF 56.0mm
    • Total lens length 374.7mm
    • Inner focus
  • Example 5
    • Focal length f = 588mm
    • Fno. 4.12
    • Angle of view 2ω = 4.22 °
    • BF 55.0mm
    • Total lens length 343.5mm
    • Inner focus
    • Diffraction optical element
  • Effect of the glass material
    • Fluorite (Fluorite)
      • In the long lens fluorite + total length, correction of chromatic aberration is easy
      • In short lens fluorite + total length, correction of chromatic aberration is difficult
    • Diffractive optical element (DOE)
      • Diffractive optical element can be corrected if the chromatic aberration
      • Flare caused by light diffraction
November 21, 2012
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Posted in News

Canon EF 600mm f/4L IS II USM Lens In Stock

Canon EF 600mm f/4L IS II USM Lens In Stock

B&H has the Canon’s EF 600mm f/4L IS II USM Telephoto lens in stock and ready to ship for $12,999 (click here). Limited quantity.

Product description:

Canon’s EF 600mm f/4L IS II USM Telephoto Lens has all the upgrades needed to make it the go-to super long telephoto lens for professional photographers and anyone who has the highest standards for the gear they use.

First and foremost, image sharpness is enhanced with fluorite optics that deliver reduced chromatic aberration. The lighter weight (3 lbs lighter due to magnesium and titanium construction elements) is always welcome in very large telephoto lenses. Using 3 IS (Image Stabilization) modes allows you to shoot at shutter speeds 4 stops slower, and the advanced third IS mode activates only when the shutter button is fully pressed, so you can pan with fast-moving subjects without the IS function interfering with composition and framing.

Dust and water sealing keeps the lens functioning even in less than ideal conditions, and a Power Focus mode allows smooth focus change while shooting video.

Fluorite optics for sharper images and less chromatic aberration.

Lighter weight due to magnesium and titanium construction elements.

Three IS (Image Stabilization) modes offer a 4-stop shutter speed advantage.

Advanced image stabilization Mode 3 activates only when shutter button is fully pressed, allowing for panning to follow fast-moving subjects.

Inner focusing system with focusing cam

Power Focus mode allows smooth focus change when shooting video.

Dust and water sealing for shooting in the most challenging environments.

November 14, 2012
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Posted in News

Canon’s EF 600mm f/4L IS II USM Telephoto Lens In Stock At B&H

Canon's EF 600mm f/4L IS II USM Telephoto Lens In Stock At B&H

[source: The Digital Picture]

B&H has the Canon EF 600mm f/4L IS II USM lens in stock and ready to ship for $12,999 (click here).

Specs:

 

  • Fluorite optics for sharper images and less chromatic aberration.
  • Lighter weight due to magnesium and titanium construction elements.
  • Three IS (Image Stabilization) modes offer a 4-stop shutter speed advantage.
  • Advanced image stabilization Mode 3 activates only when shutter button is fully pressed, allowing for panning to follow fast-moving subjects.
  • Inner focusing system with focusing cam
  • Power Focus mode allows smooth focus change when shooting video.
  • Dust and water sealing for shooting in the most challenging environments.
August 15, 2012
Posted in News

Firmware Upgrades For Wireless Transmitter WFT-E5A And 4 Lenses

Canon has recently released two new product advisories. The first one concerns the WFT-E5A Wireless Transmitter. The firmware upgrade (ver. 1.0.7) doesn’t tackle problems or malfunctions, it was released to support the just released, massive firmware update for the EOS 7D.

Next, Canon also released a product advisory for the following lenses: EF 300mm f/2.8L IS II USM, EF 400mm f/2.8L IS II USM, EF 500mm f/4L IS II USM, and EF 600mm f/4L IS II USM. The firmware update (ver. 1.1.1) will be performed by Canon Service Centers and brings the following enhancement:

Changes the control algorithm of the focus drive, and enhances the drive’s responsiveness for more precise focus and adjustments. In particular, the new firmware enhances the AI servo AF capability of the lenses to track objects that move irregularly in sports events, such as soccer or rugby.

July 12, 2012
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Posted in patents

[Patent] Canon Files Patent For 600mm f/5.6 and 800mm f/5.6

600mm f/5.6 DO

800mm f/5.6 DO

Egami (machine translated) found a patent filed by Canon for a 600mm and a 800mm f/5.6 lens using diffractive optical elements.

  • Patent Publication No. 2012-123152
    • 2012.6.28 Release Date
    • 2010.12.8 filing date
  • Example 1
    • Focal length f = 584.99mm
    • Fno. 5.80
    • Half angle of 2.12 deg.
    • Image height 21.64mm
    • Length 360.03mm
    • BF 94.84mm
    • 17 pieces in 10 groups Lens Construction
    • 3 UD glass sheet
    • One fluorite
    • A surface diffraction plane
  • Example 3
    • Focal length f = 779.00mm
    • Fno. 5.80
    • Half angle of 1.59 deg.
    • Image height 21.64mm
    • Length 462.02mm
    • BF 120.29mm
    • 17 pieces in 10 groups Lens Construction
    • 2 UD glass sheet
    • Two fluorite
    • A surface diffraction plane
  • Low dispersion material with anomalous partial dispersion
    • To be effective in the correction of chromatic aberration
    • Specific gravity is large (heavy)
      • 3.18 fluorite
      • FK01 3.63
      • The specific gravity of small anomalous partial dispersion glass material
        • FK5 2.46
        • BK7 2.52
    • Surface may be damaged easily
    • FK01 is fragile due to temperature changes and large diameter
  • Diffractive optical element (DOE)
    • To be effective in the correction of chromatic aberration
    • Is generated by unwanted light flare and ghosting
  • Canon’s patented
    • Become positive from negative to DOE
    • DOE to place the position is hard to unwanted light incident
June 17, 2012
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Posted in Reviews

[Review] Canon EF 600mm f/4L IS II

canonrumors reviewed Canon’s long awaited EF 600mm f/4L IS II. Impressions are very good. From the verdict:

On the surface, Canon has produced the best designed 600mm lens in their history and maybe ever. The weight savings alone are a monumental achievement. Everything else about the lens is high end, from optical performance to autofocus and build quality.

There are sample images provided. The EF 600mm f/4L IS II has a price tag of $12,999 and can be pre-ordered at the following shops:

 

May 24, 2012
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Posted in News

Canon EF 500mm f/4L IS II USM & EF 600mm f/4L IS II USM Available for Pre-Order (Update)

Canon 500mm f/4L EF IS II USM Lens

Update: Adorama also has both lenses ready for pre-order.

Announced in February, the EF 500mm f/4L IS II USM ($10,499 click here) and the EF 600mm f/4L IS II USM ($12,999 click here) are finally ready for pre-order at B&H. See the press release, and here for more detailed specs.

In short:

  • EF 500mm f/4L IS II USM:

    • Redesigned Fluorite Optics
    • Less Chromatic Aberration
    • Magnesium/Titanium for Lighter Weight
    • 3 IS Modes for 4-Stop Advantage
    • Smooth Focus Change for Video
    • Redesigned, Intuitive Buttons/Switches
  • EF 600mm f/4L IS II USM:
    • Fluorite Optics for Sharper Images
    • Less Chromatic Aberration
    • Magnesium/Titanium for Lighter Weight
    • 3 IS Modes for 4-Stop Advantage
    • Smooth Focus Change for Video

EF 600mm f/4L IS II USM Telephoto Lens

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