Mint/like new.
Arrived late Dec 2020.
$310 shipped.
https://www.astro-physics.com/baradv
Our Advanced Convertible Barlow has a unique design that provides several configurations to increase the focal length of your telescope. It was designed to match the characteristics of small and medium-sized CCD chips. It is also ideal for high-power visual observation and lunar-planetary-solar photography. This redesigned optic features a flatter field, allowing it to be used for deep-sky photography when increased magnification of smaller objects is desired.