- Ultra-wideband, fully multilayer-coated lens: This advanced doublet glass design features 30mm achromatic optics that minimize irritating reflections, delivering bright and clear images for an enhanced viewing experience. - 45mm back focus distance: Enables easy and precise focus adjustments. The f4 aperture optics provide a wide field of view, making it easier to locate and observe celestial targets during astronomical observations. - Adjustable eyepiece location: This feature allows for fine-tuning to achieve sharper images, enhancing overall clarity and detail. - Versatile application: Compatible with all types of telescopes, including reflector and refractor models. Perfect for observing star clusters, the moon, planets, and other celestial bodies. Use Scenarios: 1. Ideal for amateur astronomers who want a reliable and easy-to-use lens for backyard stargazing. 2. Suitable for educational purposes, allowing students and educators to explore astronomy in a hands-on manner. 3. Great for astrophotography enthusiasts seeking to capture detailed images of celestial events. This product combines high-quality materials and exceptional performance, making it an essential addition to your astronomical toolkit.