For context, the famous JWST also uses a 6.5-meter primary mirror to capture infrared light from the early universe.
2. The Micro-Detail Perspective: Industrial Video Microscopes 6.5 Metre 1080P
In manufacturing and research, "6.5" often refers to the or zoom ratio of an objective lens, paired with a digital camera system. For context, the famous JWST also uses a 6