Dead simple zoom mod for Minecraft 1.8.9 (Ornithe/Fabric), configured through OneConfig.
Hold C to zoom, F6 for the secondary zoom, scroll while zooming to go further.
PolyZoom maintains compatibility with Zoomify's configuration file, and supports everything it does (besides the irrelevant spyglass options).
Configure keybinds in vanilla's options menu, and zoom settings in OneConfig.