Chris S.
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Upload & Sell: Off
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Dirb9's block diagrams were interesting, and as far as can be seen in such a graphic, there are strong similarities between the Nikkor and the Samyang. That said, some important things are not expressed in such a diagram--refraction properties of materials used for each element, precision achieved in grinding each element, coatings placed on the elements, and alignment/collation/ quality-control issues.
I think it within the realm of possibility that the Samyang may turn out to be a superior product. Maybe Samyang is creating some cheap eBay sales channels in advance of public scrutiny of the lens, so that if people are intrigued by tests, they have somewhere to go and buy.
That said, until some of the respected reviewers go over this lens in convincing ways, and unless they rave about it, it's off of my list. Would love to be overwhelmed with quality data to convince me other othwerwise. These data may someday exist, but seem to be absent now. So at the moment, it's Nikkor or Zeiss for me. If the Samyang were dirt cheap, I'd be temped to give it a shot.
--Chris
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People originally put off Vivitar when they came out with the Series 1 lenses; some of which later proved to be the best in their class, third party or OEM. 
People rave about the iq from the nikkor and its probably going to be redone soon anyway....