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| The coating on the Vivitar front glass is more blue, the other two has a similar coler, more pink. |
With the screw-on adapter, 1:1 ratio can be achieved. Without the adapter, the lens can be uses as a 100mm prime.
Besides the brand names on the front plates, another difference I notice is the coating colors on the front and rear glasses. However, I am not sure if the color variation is among the brand names or individual copies,
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