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Max Back Focus: 72 mm
stability and ease-of-use
unwanted light at other wavelengths is reduced
With a Narrowband H-alpha filter
●High sound quality
William Optics Zenithstar 81 Version IV Telescope Guide Camera ST4 Max Back Focus: 72 mmWe are very exciting to announce All New Super ZenithStar 81 Version IV F6. 9 imaging APO!! New upgraded 2020 model with 2. 5" R&P focuser and Camera Angle Rotator Innovative Bahtinov Mask Cover (Patented) included! Soft Carry Case Included. This beautiful scope is everything you always wanted in a refractor, starting from extreme sharpness for clear details, and APO colour correction. It has all the benefits of the ZenithStar family at a price that
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