Spyglass item in Minecraft
The Spyglass zooms in on whatever you look at, so you can scout far away without moving. It is crafted from Copper Ingots and an Amethyst Shard.
It is made with the Crafting Table from Amethyst Shard and 2 × Copper Ingot.
What it does
Hold the use button to look through it: the view narrows and distant mobs, structures and players become easy to spot. Release it to go back to your normal view.
Use it to check a distant hill for a structure before travelling or to watch a raid coming. It does not change anything in the world and has no durability.
It does not stack, so a single one in your hotbar is enough.
How to craft
Crafting table 
Amethyst Shard + 2 × Copper Ingot → Spyglass
// Slots with several items cycle through every accepted option.
How Spyglass connects
4 links · from the 26.3 game dataWhere to get it
Advancements
Is It a Plane?Look at the Ender Dragon through a SpyglassIs It a Balloon?Look at a Ghast through a SpyglassIs It a Bird?Look at a Parrot through a SpyglassSpyglass · FAQ
How do you get Spyglass in Minecraft?
At the Crafting Table: 1 × Amethyst Shard and 2 × Copper Ingot give 1 × Spyglass. It can be found as loot in Abandoned Camp.
What is Spyglass used for in Minecraft?
It zooms in on distant things when you look through it.
Does Spyglass stack?
No: only one per inventory slot.
Which advancements involve Spyglass?
Is It a Plane? (Look at the Ender Dragon through a Spyglass); Is It a Balloon? (Look at a Ghast through a Spyglass); Is It a Bird? (Look at a Parrot through a Spyglass).