The 60°-viewing is used in a horizontal position where the angled eyepiece is more ergonomic. Besides the standard version there are also versions with mechanical double micrometer and digital micrometer available. The main differences to the straight or 90°-viewing versions are the folding mirror with 60° between objective and corner cube. That limits the 60° variants in their focal length (f=300 & 500 mm) and tube diameter (65 mm).
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