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 Post subject: Tamron 17-50mm f/2.8 VC
PostPosted: Fri Sep 04, 2009 9:20 am 
http://tamron.com/news/35mm/1750di2_VC_2009.asp

TAMRON LAUNCHES FAST SP AF17-50MM WITH
VIBRATION COMPENSATION FOR NIKON DX-FORMAT DSLRS

Groundbreaking high-speed, high-definition f/2.8 standard zoom features Tamron’s
Vibration Compensation (VC) image stabilization mechanism

September 1, 2009, Commack, NY— Tamron USA, Inc. announced the release of the SP AF17-50mm F/2.8 XR Di II* VC LD Aspherical [IF] (Model B005), a high speed f/2.8 wide-to-moderate-telephoto zoom lens designed exclusively for Nikon-mount digital SLR cameras with smaller sensors and now featuring Tamron’s proprietary tri-axial Vibration Compensation (VC) mechanism that minimizes the effects of handheld camera shake. Tamron plans to introduce the lens in a Canon mount version shortly after the new Nikon mount version with built-in motor hits the market.

*Di (Digitally integrated)-II lenses are designed for exclusive use on digital cameras with smaller-size imagers. This lens is not designed for use with 35mm film cameras or digital SLR cameras with image sensors larger than 24mm x 16mm.



The new SP 17-50mm F/2.8 XR Di II VC covers the very popular 17-50mm focal length range (equivalent to 26-78mm in the full-frame 35mm format*) making it extremely versatile. Its wide aperture and outstanding performance provide practical advantages in low-light shooting and aesthetic image control, thereby enriching the user’s range of creative expression. The new lens delivers impressive sharpness and striking contrast over its entire focal-length and aperture range, and at its maximum aperture of f/2.8 it produces beautiful images enhanced by shallow depth of- field, and smooth, natural transitions in out-of-focus areas of the image (i.e. excellent bokeh.) The new lens is equipped with Tamron’s proprietary Vibration Compensation (VC) image stabilization mechanism, which controls the effects of camera shake in three planes. VC provides more opportunities for sharp hand-held photography at the slow shutter speeds needed when shooting in low-light conditions (e.g. night or indoor scenes) dramatically enhancing the user’s level of photographic freedom.

*Tamron’s conversion value is 1.55x



MISSION ACCOMPLISHED
The previously announced, still currently available Tamron SP 17-50mm F/2.8 XR Di II (Model A16) boasts superlative optical performance for a fast standard zoom lens and has been acclaimed world-wide as a masterpiece of compact optical design. In developing the new Tamron SP 17-50mm F/2.8 XR Di II VC zoom, the primary goal was to maintain this incredible compactness and ease-of-use while simultaneously enhancing its convenience and expanding its performance envelope. As a result of concerted efforts, the engineers were able to incorporate Tamron’s proprietary state-of-the-art Vibration Compensation (VC) image stabilization mechanism into the new lens without materially increasing its size and weight. As a result of this success, the SP 17-50mm F/2.8 XR Di II VC makes sharp hand-held photography possible under a vastly expanded range of photographic situations.



VC (VIBRATION COMPENSATION)
The Tamron Vibration Compensation mechanism employs a three-coil system in which three driving coils move internal optical components within the VC lens electromagnetically, based on signals originating from three steel ball bearings. Since the VC compensating lens elements are held in place solely by contact with these bearings, smooth, virtually frictionless movement is assured, providing the stabilized viewfinder images and excellent tracking performance characteristic of VC lenses. Moreover, since the VC lens elements move parallel to the image plane via electronic control alone, the mechanical structure is simplified, and the lens is more compact.



PRODUCT FEATURES

1. Tamron’s proprietary VC (Vibration Compensation) image stabilization mechanism
Equipping a fast standard zoom with the advanced VC mechanism enables extended hand-held shooting possibilities along with enhanced versatility. It allows the full range of photographic expression, all the way from maximizing the expressive background-blurring effects by shooting at the maximum aperture of f/2.8, to fixed focus photography at the smallest apertures using extended depth of field.
2. Compact size with a filter thread of Ø72mm, while delivering both a large F/2.8 diameter and VC
While the size of a lens tends to increase when it’s equipped with an image stabilizer unit, Tamron has kept this lens as compact as possible through improvements to optical, mechanical and VC designs, thus achieving a remarkably compact size with a filter thread of 72mm.

Since the new Tamron 17-50mm VC lens is a large diameter f/2.8 zoom, the optical image stabilization system is also relatively large compared with previous VC lenses. To achieve the same anti-shake effect as the renowned VC mechanism incorporated into Tamron’s high power zoom lenses— models B003 and A20— the engineers had to enhance the VC unit itself, the mechanism that controls the optical image stabilization system. This initially led to an increase in size compared with existing lenses. It was therefore necessary to reduce the size of the VC unit while at the same time increasing its torque of driving power. This could only be achieved by bringing to all of Tamron’s advanced engineering capabilities that had enabled is to produce high-power zoom lenses and light, compact, high-speed standard zooms. After a prolonged program of development entailing exhaustive research and tireless testing, Tamron’s engineers finally achieved their goal, a fast, compact zoom lens with a filter thread of 72mm incorporating both a large f/2.8 maximum aperture and an effective Vibration Compensation mechanism.

This stunning achievement entailed innovations in both manufacturing technology and production engineering, including improvements to the precision, weight, and strength of the lens’ components. The result: The Tamron SP AF17-50mm F/2.8 XR Di II VC, an extraordinarily complex lens to manufacture but a joy to use.
3. The optical system, optimized for the characteristics of digital cameras, uses special glass for multiple elements, to enhance optical quality while maintaining compactness
With its innovative use of XR (Extra Refractive Index) glass, Tamron has optimized the overall optical power distribution and reduced the size of the lens, while at the same time implementing advanced correction of optical aberrations. In addition, the optimized positioning of three compound aspheric elements has enabled further shortening and compression of the entire optical system while maintaining outstanding imaging performance. Two LD (low dispersion) lens elements are also employed to make effective corrections for axial chromatic aberrations and chromatic aberrations due to magnification, a major factor in enhancing optical quality in digital photography. The result: excellent image performance throughout the zoom range.
• Optimizing the angle of light rays striking the image sensor
To reduce the impact of changes in aberrations due to zooming, the optical design adopted for this lens was developed to literally guide the angles of rays of light entering from the center to the periphery of the lens. This ensures that the light rays fall within a set range on the image sensor, enhancing image quality.
• Reduced fall-off of peripheral brightness
The fall-off in peripheral brightness that limits resolution in wide-angle shooting is very well controlled, resulting in excellent image detail from the center to the outer edges and corners of the image field.
• Superior resolution
As an SP Di II class lens, this lens delivers top imaging performance in all key parameters--high resolution, high contrast, and excellent detail rendition.
• Uncompromising countermeasures to reduce ghosting and flare
The latest BBAR (Broad-Band Anti-Reflection) multi-layer coatings are used to reduce reflection from the lens, ensuring excellent performance in all photographic conditions. The coatings enhance light transmission in both the short wavelength and long wavelength ranges. In addition, internal surface coatings (coatings on cemented surfaces of lens elements) have been applied to all cemented surfaces, for sharpness, optimum color reproduction performance and excellent color balance.
4. Minimum focus distance of 11.4” (0.29m) across the zoom range, with macro capability of 1:4.8
Even with its VC image stabilization optical system this lens delivers a minimum focus distance of 11.4” over the entire zoom range, enabling stress-free close-up photography. The maximum magnification ratio at 50mm is 1:4.8*.

*This lens enables photography of virtually the same range as that when using a lens with a maximum magnification ratio of 1:3.1 on a full frame format camera, as APS-C size image sensors are smaller than 35mm film.
5. Simple, beautiful exterior design
A simple, classic design with a smooth silhouette has been adopted to ensure that this lens combines well with various SLR cameras. The highest quality textured paint has been used to give a superb finish to the exterior.
6. Zoom lock mechanism, useful when carrying the lens/camera over your shoulder
The lens includes Tamron’s zoom lock mechanism to prevent the lens barrel from extending by its own weight when lens is being carried on the camera pointing downward.
7. Flower-shaped hood with excellent stray light shielding properties supplied as standard accessory
The flower-shaped hood is ideally matched to the frame of the viewfinder screen to effectively block damaging light rays coming in from outside the borders of the image area, ensuring clear, sharp flare-free performance. The hood is provided as a standard accessory.


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 Post subject:
PostPosted: Fri Sep 04, 2009 12:55 pm 
Thanks for posting this logbi77. It is about time somebody put VR/IS/OS/VC in a lens of this range, hopefully it performs well.


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 Post subject:
PostPosted: Fri Sep 04, 2009 3:12 pm 
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Thanks for posting :)

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PostPosted: Fri Sep 04, 2009 4:40 pm 
Would Image Stabilization make a big difference at this focal length?

I am considering the Tamron 17-50 f/2.8. Looks like there is a $200 USD difference between the VC and non-VC version.

Does it make a big difference?


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 Post subject:
PostPosted: Fri Sep 04, 2009 5:37 pm 
it's the motor that's costing that much more.

not really.

i have the 17-50 and shoot 1/10 or longer exposures without a problem.


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 Post subject:
PostPosted: Sat Sep 05, 2009 8:24 pm 
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p2sam wrote:
Would Image Stabilization make a big difference at this focal length?

Weeeell, this depends on how you shoot! I prefer to get close to the foreground when shooting wide-angle lenses and you could produce shake under less than optimal circumstances even at 20mm focal length :shock:
So yes: an effective image stabilisation is a valuable asset even with normal or short focal lengths!

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Last edited by Thomas on Tue Oct 13, 2009 6:26 pm, edited 1 time in total.

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 Post subject:
PostPosted: Tue Oct 13, 2009 9:08 am 
:D Don't take VC for granted..
I recently got a 40D and i immediately noticed the lack of IS, or VC compared to my A300.

I guess i took thing for granted? :oops:


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 Post subject:
PostPosted: Tue Oct 13, 2009 6:31 pm 
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The other cautionary note: I once tested the efficiency of Sigmas OS (optical stabilization) on a brand-new 120-400 zoom. And was sorely disappointed (just one stop).
VR/IS/OS/VC is a very delicate thing where you need a lot of experience and good engineering to make it really work. I have not tested any VC lens from Tamron, but I'd assume that it is not as effective as Nikon's VR, Canon's IS or Sony's steady shot.

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 Post subject:
PostPosted: Tue Oct 13, 2009 7:20 pm 
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The strength of IS/VR/VC/OS/etc can vary from lens to lens, not just by brand.

For a comparable focal length, the effect of the VC in the Tamron 18-270 is noticeably much stronger than the IS in the Canon 100-400L. Then again, the 18-270 is a recent lens design, and the 100-400L has been around for a very long time and an early implementation.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
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 Post subject:
PostPosted: Wed Oct 14, 2009 7:31 am 
popo wrote:
The strength of IS/VR/VC/OS/etc can vary from lens to lens, not just by brand.

For a comparable focal length, the effect of the VC in the Tamron 18-270 is noticeably much stronger than the IS in the Canon 100-400L. Then again, the 18-270 is a recent lens design, and the 100-400L has been around for a very long time and an early implementation.


I've heard that the IS of the 100-400L is not very effective. But then again, the Sony's SS is not very effective at longer local lengths. It was Extremely effective on shorter focal lengths (the 16-1xx range)


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 Post subject:
PostPosted: Mon Oct 26, 2009 12:50 am 
IS/VR/VC/OS sometimes is a miracle ...:) For example,my 18-105mm allows me to get sharp photos even at 1/20,if I struggle a bit to stand still.

I think Tamron made an excellent adition to their lenses line. Sigma already issued the 18-50mm F/2.8-4.5 with OS,so the sharpest lens in this category had to keep it's title. :)


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 Post subject:
PostPosted: Tue Dec 01, 2009 10:09 am 
I must admit, I like the sound of this lens.

I was considering saving up for the Canon EF-S 17-55 F2.8. However, even on discount web-based camera shops it retails for close to $1200 Australian! Even second-hand ones without warranties sell for $900 on E-bay!!

I've heard a lot of good stuff about the Canon EF-S 17-55, but while it remains prohibitively expensive, I've always wondered if I could get away with buying a Tamron 17-50 f2.8 with image stabilisation at almost half the price?

Does anyone know if the Tamron 17-50 is in the same class as the Canon 17-55 or is it wishful thinking on my part?


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 Post subject:
PostPosted: Tue Dec 01, 2009 11:22 am 
it is not the same class especially mechanical and iq. But image quality is pretty close especially if you get a good copy. Tamron quality control is not as good as Canon. make sure store you buy from have a good return policy.


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 Post subject:
PostPosted: Thu Dec 03, 2009 4:31 pm 
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Forget the stabilisation, the real amazing thing about this lens is that it's High Definition!

Seriously, is anyone buying the recent "high definition" hype?

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 Post subject:
PostPosted: Thu Dec 03, 2009 7:56 pm 
All I want to know is if the Tamron is worth buying?

Because if the Tamron 17-50 can acheive the same image quality as the Canon EF-S 17-55 F2.8 at half the price, why not?


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