Well, my assessment:
The first impression of the product was very good. No protruding degrees or other outlets that were poorly processed. The attachment of the lens worked perfectly. Since the fit was my main concern, I'm already satisfied.
In the field test, there were no problems. For each zoom level, there were no difficulties that you have shade, or even parts of the iris in the image. Furthermore, the panel completed its work so as you would expect - good.
Conclusion:
after I original product and now the JJC panel had at a dealer in comparison, falls to no significant difference. In addition, this panel is cheaper by half. Therefore, an absolute must for the specified lens.