The Swarovski STX Spotting Scope Modular Zoom Eyepiece (Straight Viewing) was specifically designed for STX series spotting scopes, and its straight-view configuration makes it the perfect choice for long-range wildlife observation and digiscoping. This straight-viewing eyepiece mounts easily to your STX series spotting scope using an STX objective assembly, turning your scope into a formidable platform for digital imaging. The Swarovski STX Spotting Scope Modular Zoom Straight-Viewing Eyepiece features a grooved zoom dial and side-by-side focus and zoom dials to ensure easy one-handed operation.