Body: Its body is bigger and better lens body than old version, Tamron 17-50 F2.8. When I use it, I feel that it is more robust and fit a little bit better with my hands.
Focus Speed: The focus speed of is faster than Tamron 17-50 F2.8 but it’s still slower than Ultra Sonic Motor (USM for Canon) or Silent Wave Motor (SWM for Nikon). Anyway, I am impressed with this improvement.
Focus Sound: The non VC version, Tamron 17-50 F 2.8, is so noisy; however, this version produces less noisy which is acceptable. If you compare its focus sound to Ultra Sonic Motor (USM for Canon) or Silent Wave Motor (SWM for Nikon) , it is still far away from the big names.
Vibration Compensation (VC): The Vibration Compensation (VC) is the most interesting point that I would like to see how excellent it is. I tried several slow speed shots and I still got good images. You can see from the sample shot below that I am able to hand held and a take photo at 50 mm with shutter speed of ¼ sec and I still got a nice photo. It is almost impossible for me to hand held and take good quality photos with ¼ sec shutter speed. When VC is on, you will see a little bit shaking, similar to Image Stabilizer (IS) of Canon, in your view finder while focusing and taking photos so please do not panic because VC is working.
Sharpness: At F2.8, this lens produces nice and acceptable sharp images. When you stopped down, this lens can create excellent image quality as you can see from the sample below. I capture detail at the middle of this photo.
Referring to a sample photo below with 100% zoom, at f 2.8 a photo is a little blur but over all image quality is good. When aperture is stopped down to F 4 onwards, the image quality is excellent. The image quality will decrease when aperture is very small (F22) but the overall is still very good.
Distortion: At 17 mm, barrel distortion is noticeable as you can see from sample shots. The barrel distortion reduces when long focal length is applied. There is slightly noticeable barrel at 24 mm. After a focal length of 24 mm, the barrel distortion is almost none.
Price: Tamron 17-50 F 2.8 VC’s price is about 649$ (according to amazon.com) for both Nikon and Canon Mount which is 149 $ higher than the old version, Tamron 17-50 F 2.8.
In comparison to Nikor 17-55 F 2.8 (1330 $) in case of Nikon mount, it’s almost half price of Nikor lens. What’s more, looking at Canon Lens for the same focal range , Canon EF-S 17-55mm f/2.8 IS USM Lens (1040 $), the Tamron is still 400 approximately cheaper.
Conclusion: Although I did not much time for testing this lens, I think this lens is one of the good normal zoom lens for APS-C sensor camera. Therefore, before buying new normal lens or upgrading new lens for your digital camera, please consider this lens, Tamron 17-50 F 2.8 VC.
Fuente:
http://www.photoshopphotography.com/tamron-17-50-vc-review/Mas lo uso, mas amo a mi Tammy!!!
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