Tamron 500mm f8 is different kind of fish... much better optics than Samyang/Opteka/Bower/Rokinon/etc. mirror lens...
Also, it seems Opteka is Samyang (Korea), but manufactured in China (mine is Opteka.. not sure if coma in my specimen is quality issue?)
Last edited by bojan; 16-07-2019 at 03:00 PM.
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