Corrects image orientation: the diagonal produces an erect image and corrects both upsidedown and leftright reversed views, making daytime terrestrial observation natural and easy to interpret. Compatible with standard 1.25inch eyepieces: fits any astronomical telescope eyepiece and focuser that accepts the 1.25 in (31.7 mm) standard. Works with refractor and catadioptric telescope designs. Comfortable 45° viewing angle: the diagonal presents the image at a 45degree angle so you can view through a refractor while standing or sitting without awkward neck positions. Keeps optics clean and protected: includes a dust cover to protect the diagonal and eyepiece from dust and debris, helping maintain clear views and extending component life. Simple to install and use: slips into the 1.25inch focuser and accepts standard eyepieces; no tools required for routine attachment and removal. Use scenarios Daytime nature observation: convert a refractor into a comfortable spotting scope for birdwatching, wildlife viewing, or shoreline and landscape observation with correctly oriented images. Travel and fieldwork: attach to a portable refractor or catadioptric scope for surveying or scenic viewing when you need a compact, easytouse erecting accessory. Casual backyard observing: add to a standard 1.25inch eyepiece setup to reduce eye strain and simplify identifying terrestrial subjects during daylight sessions. What you get A 45° erecting diagonal compatible with 1.25inch eyepieces Dust cover for protection Easy, tool installation Notes Designed for daytime and terrestrial viewing where an erect image is required. Use with refractor and catadioptric telescope systems that accept 1.25inch eyepieces.