RuneScape Classic Wiki
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The main RuneScape Wiki has an article on: Lens
The Old School RuneScape Wiki also has an article on Lens.

The Lens is a quest item used in the Observatory Quest. It is produced by using a lens mould on molten glass. It requires level 10 Crafting to make and gives no crafting experience.

Making the lens players get the following message:

"You pour the molten glass into the mould
And clasp it together
It produces a small convex glass disc"

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