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Samyang is the only lens maker who understands harmonic design.
They understand what the E-mount is. An orange ring with silver accent.
And thus they design their AF series with a Orange ring, and a thinner silver ring.
The others are hopeless.
Tamron has some weird white Ring.
Sigma has some matte plastic clashing with glossy plastic, making their design both gross and boring at the same time.
Sony gets close with the orange GM badge, but not as close as Samyang does.