The last wave of # sun single contest # activities, before the test of the iPhone 8 Plus, friends @ school fresh Ron gave a Sigma 17-50 F2.8, with a very cool, double 11 this head and back At the price of 1899 (it is said that he also entered the price, it has remained strong for several years), with PLUS members 1000-40 coupons and 10000 Jingdou, 1759 won.
However, the local JD.com warehouse had no goods. It was delayed until today on the 23rd. The shots were sent from Suzhou Outhouse.
The express order shows that the goods were sent from the warehouse in Suzhou to the Wuhan Asia Picking Center and then dispatched again. The road is far away and is very worried that the transportation process will be damaged. 
When I received a wrap wrestling courier, I had 10,000 heads in my heart. 
Fortunately, open the box, lens packaging and no obvious damage, try it first.
JD.com said that Sigma had cancelled the sealing label, and the plastic film was also JD.com's own plastic film. Believe it or not, it could only accept it. 
It seems that all of the goods imported by the regular agents must be affixed with a Chinese label. The label has shots of origin, importers and other information. 
This Jingdong own sealing film level, I also unable to Tucao, according to the Jingdong this argument, the other channels of this lens even this film are not. 
Original licensed, three-year warranty, to buy the warranty in Jingdong is still relatively convenient, in fact, there is a two-year extension of the 89-dollar warranty, I personally think it is still very cost-effective, five-year warranty is also able to return to this, and I The main reason for not purchasing an extended warranty is not knowing whether or not it will change the full size. 
The lens number is actually a good number ending in 9999. I hope it will last a long time.
To tear off the JD film is a lot of pleasing to the eye, it can not be sealed better, tearing off the film full of JD what to prevent the opening measures are gone. 
Out of the box is the manual warranty card and so on.
This anti-counterfeiting label was also arbitrarily tampered with, and there was a feeling of buying fake goods. 
The lens package, the familiar look, is the same as the previous purchase of 8-12, but it's a lot shorter. That's because 17-50 itself is not long. 
Lens bag work is still good, this price lens also comes with such a quality lens package is not much. 
Originally thought that the lens and the lens hood were placed in a plastic bag. 
Unexpectedly, the two were packaged separately. It may be caused by damage during installation and transportation. 
Sigma 17-50 F2.8 EX DC OS HSM, gold ring can use Nikon's body to experience the pseudo high-end feeling. 
The closest focusing distance is 28cm, macro is also good, suitable for making small things. 
The AF switch is near the lens mount. 
Under the autofocus switch is the optical anti-shake switch. Pro-measure will sound when the lens is turned on or off. It seems that this switch only controls the electronic part and there is no mechanical limit function. 
From this point of view, the material of the lens cap is not very good, there is a feeling of recycling plastic, the edge has obvious discoloration. 
Open the lens cover, the lens is shining, the lens is transparent, the coating is red and green, the lens diameter is 77mm, and the Phoenix SPII UV Mirror is still on the way. The price is very high and the cost is very high. 
Lens mount, metal snap ring, shiny and wear-free. It should not be on the plane, so the camera should be brand new. 
Since the Sigma 17-50 is not an internal zoom lens, and the mirror group is heavy, Sigma has set a zoom cutout for the lens. When the lens shape at the wide-angle end is shortest, it can be locked to prevent itself from falling out due to gravity. Bad lens, which also highlights the importance of this lens mount UV. 
This is a wide-angle end with a length of 91.8mm, and the length of less than 10cm is relatively short in the lens. 
The telephoto end sticks out about 3.5cm (not accurately measured). This length is also good. It is almost the same as my 8-12, but 8-12 is the inner zoom, and the lens shape will not change. 
Since the 17mm is a lens with a slightly wider angle, the hood is made larger in order not to leave a black corner at the wide-angle end. 
On the machine, and Nikon's body is still very tune, 17-50 size is also more harmonious with the APS-C body.
A simple test of the coke operation, it really is a little bit, the focal plane slightly moved back half a line to a line of text. 
You can see that the focus is the text on the pen. Actually, the text behind the pen is clear. 
Through the fuselage focus fine-tuning, you can pull back the focal plane a little bit, pen body immediately clear, non-original lens, a little bit out of focus or can accept, after all, can be corrected by the fuselage back, not affect the use. 
Put some pictures of this head and D7000 below and go straight out. I believe many people have seen it, and the extraneous transition is relatively soft, and the focus is also sharp and clear. It's just a good idea to take something like a mobile phone.
Summarize the advantages and disadvantages of SIGMA 17-50 F2.8 EX DC OS HSM, for your reference
advantage:
Affordable constant large aperture,
The workmanship is fairly meticulous, and the gift package is also convenient for storage (but generally this head becomes a hang-up, and the usefulness of the package is not great)
Disadvantages:
The shaking sound is a bit unpleasant
The focus ring rotates during autofocus. If the hand-held position is incorrect, hold the focus ring and the focus motor will scream.
Compared to the kit head, the Sigma 17-50 F2.8 will surely increase tremendously, only a quarter of the price of Nikon's own 17-55, even if the disadvantages can be ignored, if you are a Nikon APS-C body, Don't hesitate. You can sell 18-105 and sell 800-800.
In general, the National Bank’s 1800 or so price is worth buying.
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