How do I disassemble the front ring of the sigma lens?

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yuri mandu New Member • Posts: 1
How do I disassemble the front ring of the sigma lens?

These lenses are sigma 800mm f/5.6 apo ex dg hsm,

I want to disassembling the front element, but I can't find a way.

There are no grooves in the front lens ring.

Do you know how to disassemble this front ring?

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