This is a Pentax 10 by 50 S-series waterproof binoculars for terrestrial and astronomical use. It features high quality multi-coated optics, waterproof build, multi-coated lens, internal focusing mechanism with focus lock, diopter adjustment to accommodate variations in focusing of the eyes, and equipped with socket for mounting with a tripod.
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Related link: DIY Parallelogram Mount
Night Sky in Focus © Anthony Urbano | Bacoor, Philippines
Night Sky in Focus 