2 asferici, 5 a dispersione super bassa, 2 a dispersione tipo fluorite
Dustin Abbott It is an excellent lens in many ways, but probably not one that will make it into my bag. It is too large to be just a “bring along” lens [...]. The build quality feels excellent (...) , but the lack of any weather sealing is a serious shortcoming in a lens like this [...]. If you need great low light performance in a wide angle lens for events or wedding work, it is hard to think of a better alternative. The resolution from the lens is fantastic.
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