Minecraft wiki entry for Spyglass, associated text: Spyglasses are used to zoom in on a specific location in the player's field of view (FOV). The spyglass changes the FOV to 1⁄10 of the FOV set in options. By default, the FOV is set to 70° in Java Edition and 60° in Bedrock Edition, resulting in an FOV of 7° in Java Edition and 6° in Bedrock Edition through the spyglass. The player's FOV can be set from 30° to 110°, so the spyglass FOV can range from 3° to 11°. Regardless of the situation, or status effects the player has, using the Spyglass always shows a FOV 1⁄10 of the FOV set in options.