Here is a review from amateur amateur. So without an answer to the question how many line pairs in which focal length, Vignette bad or not, or other statements about laboratory tested values.
So have for people who just like to take pictures and the wherewithal left
My lab was the Park and the excavated hole, meadows, trees, flowers and walkers.
The lighting in my "tests" were modest until ok. So I had no great expectations in the mega results.
At home when looking at the pictures, there was still an absolute WOW effect.
The "wide-angle" (the 7D with me) absolutely sufficient even with a crop camera.
The colors came over fine and also agreed the sharpness.
Even sharper was when I picture a wooden hut looked, I have taken from 20 meters.
The grain was so sharply focused that I could hardly believe my eyes.
Carved from the chair got me then the "Floral Images". Color, contrast, sharpness ... absolutely amazing !!!
What I really mean to say: Anyone looking for no lens in which he can rumnörgeln about any Labor values, but one examined the absolute provides true color and sharp images, which should be the 850, - to invest and strike with this lens!
So far I have always put on the cheaper models that Tamron, and I can not deny, have always delivered good pictures. But now I'm sure that was worth this additional investment.
The Canon is worth the money in any case and I can not with a clear conscience Tell all doubting!
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Finally, I would like to say a few words to the sender, or dispatch.
I order quite a lot on Amazon, and has always been 100% satisfied. This time however I was on the verge of the package be returned to Amazon.
The seller was not Amazon itself but a third of England.
Lens, lens hood and "transport bags" were nicely bagged in its original packaging.
Also, a manual was there, however, these scratched and slightly worn ... HMH in virgin quite unusual. Should not be so also on the island!
The most important thing, so the lens, however, showed no signs of use and worked perfectly, but this is not so self-evident
because:
AMAZON UK of dispatch has not given with respect to the securing much trouble. The Objektiverpackung was carelessly without additionally stuffed clearances in a far too large packet!
AMAZON lucky that there en route from England to here nothing is broken.
Amazon Germany is as conscientious a lot!