This mod adds the ability to zoom with a spyglass item.
Usage
Use the use key (default: rightclick), to zoom in while holding the Spyglass. Note, that this blocks your hotbar, be conscious of your surroundings!
Crafting
spyglass:spyglass
default:glass G default:copper_ingot C
G C C
very different from binoculars
...and more convenient if the player is one-handed. (The actual human player, not the model in the game; hard to move the mouse around when you are holding Z). It gets stuck in spyglass mode or out of it sometimes and right-clicking stops working as the mode toggle; then you need to point it somewhere else first.