Good lens ... but you have to pay attention to the diaphragm!

Good lens ... but you have to pay attention to the diaphragm!

Sigma 17-50 mm F2.8 EX DC OS HSM Lens (77mm filter thread) for Nikon lens mount (Electronics)
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Customer Review

So first of all to the optical quality of the lens. In 2,8er shutter the part is in all focal lengths in the front field of those lenses, the times I had in hand, at the latest from aperture 4, the images are so sharp and really are the version of Nikon in every way. You just have to get a lens with the adjusted focus properly;)
BUT ... what me personally than 6 !!! has taken time, is a defective diaphragm! I have the respective lens every time a complaint and a new (always a different serial number) let me send and every time I had one with a deformed aperture at the smallest f-number. And at full aperture, the diaphragm blades do not disappear, or incomplete. Unfortunately this has also shown in the pictures also (depending on the lens). This has now not necessarily directly related to what with Amazon, because the same problem I had with even with a large photo House. :-(

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