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Released in December 1998, this USM lens achieves both extremely sharp image quality and (at least at the time) the largest aperture in its class of lens.

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How to disassemble front

Someone does know how to remove part ya-3399?

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While hard to see there are two slots within the ring as seen in this diagram. You need a spanner tool or using a rubber stopper which has the center cut out so the lens surface is not touched to spin the ring off.

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Maxim Iac will be eternally grateful.
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