Stretchable distance: 1620 inches Color classification: blue The base has a builtin standard tripod threaded interface for mounting a tripod for stable viewing. It is infinitely variable from near to far and can be adjusted by multiples. The 100mm large objective lens has a stronger concentrating effect and a brighter field of view. Smooth surface with excellent workmanship that feels good and is easy to grip. Magnification: about 3090 times (depending on the actual situation).