Svbony SV135 7-21mm Zoom Eyepiece Review

Zoom eyepieces offer a compelling proposition to the visual observer. They provide real convenience – a single eyepiece covering a range of magnifications means a more streamlined kit and less fumbling in the dark – but they’ve historically had a reputation for optical compromises. Over time the gap between a good fixed focal length eyepiece […] The post Svbony SV135 7-21mm Zoom Eyepiece Review…