First, the physical resolution is different. 1, SD: SD is a video format with a physical resolution lower than 720P. 2. HD: HD is a video format with physical resolutions of 720p, 1080i and 1080p.
Second, the picture quality is different. 1, SD: SD video has lower picture definition and color reproduction than HD video, and the picture quality is poor. 2. HD: The picture clarity and color reproduction of HD video are higher than that of SD video, and the picture quality is better.
Third, vertical scanning is different. 1, SD: The vertical resolution of SD video is 400 lines for progressive scanning. 2. HD: The vertical resolution of HD video exceeds 720 lines or 1080 lines is progressive scanning.
Telescopes for fishing are very useful when using long fishing rods (more than 7.2 meters) or fishermen have poor eyesight.
Telescope can amplify the signal of distant floating objects and transmit it to retina, and anglers can clearly see the subtle signal of distant floating objects, thus improving the hit rate and catching.
It is meaningless to fish with a short pole or when the angler's eyesight is good. Even the angler with poor eyesight can clearly observe the floating signal when floating nearby.