RCicala Offline Upload & Sell: Off
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As someone who takes them apart - there's no difference on the inside, either, and the parts are completely interchangeble. We tend to refer to them as RokiBowYang since they're identical other than brand name.
My understanding is Samyang is the manufacturer, the others simply rebrands. They buy from Samyang in quantity, Samyang agrees not to sell their own-branded lenses at less than a certain price.
The Samyang formula is pretty straightforward: they usually model the optics after an older lens (the RokiBowYang 85mm is almost optically identical to the Nikon 85mm f/1.4 D, for example), but put the optics in a much less expensive housing at a very reasonable price.
I own several personally and think they're a great bargain, as long as you realize it's not going to hold up forever (lots of glue inside where others would use screws, thinner plastic housings, etc.) and there is no repair network.
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