Normal sharpness in the center starts at f3.5, after f11 it starts to drop. In the corners, he returns to normal only at f8. I got it with a decent front focus, it was fixed on the carcass, but there is still no salvation from misses. It seems that the quality varies greatly among different copies, so buying from the Chinese turns into a lottery. In general, glass is fun and exciting, you can indulge.
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