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7-Elements/4-groups structure
resulting in a fast focal ratio of approximately f/5
RT81 Specification
flashing lights
so you'll see exactly the same thing as before
SVBONY SV109 Variable M42×0.75 (T2) Extension Tube – 24–35 mm 130mm refractor 7-Elements/4-groups structureSVBONY SV109 Variable M420. 75 (T2) Extension Tube is a precision spacing adapter designed for astrophotography imaging trains. With an adjustable extension range of 2435 mm, it allows fine control of back focus when using cameras, reducers, or field flatteners. Key Features All metal anodised construction Manufactured from aluminium alloy with an anodised finish for durability, rigidity, and long term reliability. Variable 2435 mm extension range
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