The 2.5x Barlow lens from GSO stands out in its class, both in terms of optical quality and mechanical design. The air-gapped, triple-element lens provides excellent image sharpness and contrast, and the lens edges and inner surfaces are carefully blackened to eliminate unwanted reflections.
A copper clamping ring is provided to secure the eyepieces. The free diameter of the lens is 23 mm.
The Skywatcher Heritage 130/650 Flex Dobson telescope cannot be used with the Skywatcher Heritage 130/650 Flex Dobson telescope in certain cases.