This is a mod that allows customization of the overlay when zooming in with a telescope, and it has been open-sourced on GitHub.
You can adjust the style of the overlay when zooming in with a telescope by using the command /csms-config (mode) or by modifying the mode item in the csms-config.json file located in the config directory within the game directory. There are a total of 4 modes:
| Mode | Value to Enter in Command or Config File | Explanation |
|---|---|---|
| VANILLA | 0 | Vanilla mode. |
| CUSTOM | 1 | Allows customization of the background through the left.png and right.png files in the assets/csms/gui directory of the mod JAR file. |
| NO_BACKGROUND | 2 | Does not render a background. |
| NONE | 3 | Renders nothing but the zoom effect. |
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as csms-1.0.jar — drop this file into the mods folder
- Download size: 10 KB
- Download link checked 20 Aug 2026 — working
These come from our own check of the pack file, not from the source page.