Astra IIIB Deluxe Sextant - Traditional Splitview Mirror
This item is worth 2975 Marine Miles points!
The Astra IIIB has somewhat revolutionized celestial navigation, with its excellent optics and choice of horizon mirrors and other accessories makes it the perfect selection for beginners. Yet, we know several professional navigators who prefer the ASTRA IIIB merely because they can leave their expensive models at home without sacrificing noticeable accuracy.
The Astra IIIB is made by the Changzhou Celestaire Instrument Co. in China with whom Celestaire is joint-ventured, and it is produced in accordance with our specific quality guidelines.
Lightweight aluminum frame which resists corrosion, used for many years many manufacturers for lightweight versions of their heavier brass or bronze sextants in order to reduce arm fatigue and unsteadiness among infrequent users. The Astra is electrically lighted by an LED on the arc and drum. Astra IIIB is the easiest to use, being lightweight making it a pleasure to hold, makes sights easier to take under dynamic weather and sea conditions, even reading the sextant is easier under low light conditions by having white degree marks against a black background as opposed to scribe marks on a brass arc.The index mirror is rectangular in shape and is the same size as used more expensive sextant, this shape allows more aspect of the mirror to be available for high angle sight, this means the sextant does not have to be held as steady for the.
An index mirror upgrade kit is available for older models having smaller, round, index mirrors. It comes mounted in a rectangular frame and has instructions for easy installation.
Each mirror and shade glass is tested for perfect flatness by the Fresnel diffraction pattern method. The sextants are assembled and tested in a clean, professional, environment. Random units have been tested by several professional navigators, with results that rival the most expensive German and Japanese models.
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