Green Film Achromatic Lens Stick D80 mm for DIY Astronomical Telescopes - HD Coating, Large Aperture, 1 Piece(D80F400)

Achromatic Device - This D80mm objective lens features a green film glued for superior color correction and clarity, ensuring stunning astronomical views. Versatile focal length options: Available in focal lengths of 400mm, 440mm, 720mm, and 900mm, allowing you to customize your telescope for various astronomical observations. Large Aperture for Better Light Catchment: With an actual diameter of 83mm, this lens provides excellent light transmission, making it ideal for low light conditions and deep sky viewing. USER-FRIENDLY MOUNTING - Designed for easy installation, simply align the thin side of the lens towards the scene and the thick side towards the mirror tube for optimal performance. PERFECT FOR DIY ENTHUSIASTS - Whether you're building a telescope from scratch or upgrading your existing setup, this high-definition lens is a must-have for any astronomy lover.