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+[* black] Unscrew 4 screws, take rear lens guide out, be careful the one on the upper has spring connect 3 pieces together, keep them thgether.
+[* black] Find two contact points on the rear lens rings. You need a special '井' type wrench, or tweezers may be okay(I haven't tried).
+[* black] Take lens barrel out, keep other two barrel's position unchanged. This is important, fix misaligned barrel's it's boring.

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