[Patent] Canon 24-70mm f/2.8 Image Stabilized Lens

Egami (machine translated) found a new Canon patent for a 24-70mm f/2.8 lens with Image Stabilization. They suggest, correctly in my opinion, that Canon has to react to the release of the Tamron AF 24-70mm f/2.8 SP Di USD VC which has image stabilization (called VC, Vibration Compensation by Tamron).

  • Patent Publication No. 2012-123156
    • 2012.6.28 Release Date
    • 2010.12.8 filing date
  • Example 1
    • Zoom ratio 2.46
    • 68.99mm – f = 28.00 focal length
    • Fno. 2.88
    • 17.41 deg – 37.69 half angle of view.
    • Image height 21.64mm
    • 222.38mm – 192.25 full-length lens
    • BF 39.98 – 53.68
    • Effective diameter 74.47mm ball before
    • Effective diameter aperture 31.23mm
    • 19 sheets 12 group lens configuration
    • Three three aspherical surface
    • 2 UD glass sheet
  • Example 2
    • Zoom ratio 2.86
    • 68.70 – f = 24.00 focal length
    • Fno. 2.88
    • 17.48 deg – 42.03 half angle of view.
    • Image height 21.64mm
    • 224.86mm – 191.93 full-length lens
    • BF 39.85 – 55.68mm
    • Effective diameter 77.29mm ball before
    • Effective diameter aperture 32.58mm
    • Lens Construction 12 group 21 sheets
    • Three three aspherical surface
    • 2 UD glass sheet
  • Five-group zoom positive and negative positive positive and negative
  • (For Focusing group 2) Inner Focus
  • (Part 1 of the fourth lens group, anti-vibration unit is L4a) image stabilization
  • Positive refractive power of the first lens group
    • The aberration can be corrected and weaken, the lens is larger
    • Difficult to correct aberration and strengthen
  • The amount of movement of the second lens group and one, the first
    • Must be strengthened to reduce power and refraction, aberration correction is difficult
    • Diameter of the first lens group becomes larger and more

[Review] Tamron AF 24-70mm f/2.8 SP Di USD VC Getting More Positive Reviews

Chris over at thephoblographer.com just reviewed Tamron’s new zoom lens, the AF 24-70mm f/2.8 SP Di USD VC (click here) for Canon mount. As with the other reviews I featured (here, here, and here) this one too confirms the absolutely positive impression people has with this lens. The review is detailed and comprehensive, and comes with lot of sample images. From the conclusion:

The Tamron 24-70mm f2.8 VC SP USD wins nothing less than my highest recommendations. Sure, it is expensive, but when you really weigh what you’re getting, it is quite worth its weight in gold. You’re getting excellent image stabilization, great build quality […] excellent sharpness, accurate focusing that doesn’t need microadjusting, and versatile color rendition.

Tamron AF 24-70mm f/2.8 SP Di USD VC availability and price check: Amazon USA, Amazon CA, B&H Photo, Adorama, Digitalrev, KEH Camera, eBay US, Canon USA, Canon CA, BestBuy

Image courtesy of thephoblographer.com

Tamron SP 24-70mm f/2.8 DI VC USD Review

Update: the following shops have the Tamron SP 24-70mm f/2.8 VC USD in stock and ready to ship (world-wide availability check at the end of the post):

ephotozine just reviewed the eagerly awaited Tamron SP 24-70mm f/2.8 VC USD lens. It’s an interesting lens: it covers a popular zoom range and has a constant 2.8 aperture. It weights 825g (29.1 ox) and has an 82mm filter mount. Closest focusing distance is 0.38m (15.0 in). Having a price tag of $1,299 it’s cheaper than Canon’s equivalent EF 24-70mm f/2.8L USM, which sells at $1,599 and does not have image stabilization (called vibration compensation in the Tamron galaxy). Build quality is rather good: High quality plastics have been used for much of the lens barrel’s construction and the wide rubberised zoom ring is well enough damped to prevent lens creep. Generally speaking, the performance of this lens is very good. Some excerpts from the review:

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Tamron SP 24-70mm f/2.8 DI VC USD vs Canon EF 24-70mm f/2.8L USM

Tamron recently announced the new SP 24-70mm f/2.8 DI VC USD lens (in stock at B&H for $1,299, click here), and it comes naturally to compare it to Canon’s EF 24-70mm f/2.8L USM (around $1,600, click here). Although they have the same focal length, the former comes with image stabilization (called vibration control by Tamron) and costs approx. $300 less. Over at fstoppers they reviewed both lenses for a comparison. Let’s see how they performed after the jump.

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