This Barlow is in mint condition, both optically and the barrel. Includes end cap.
It gives a big 3x magnification boost to any 1.25" eyepiece it's used with. Like new; Rarely used.
The Tri-Mag utilizes a multi-coated achromatic "negative" lens that effectively triples the focal length of the telescope's optics. The housing is precision machined from aluminum stock and black anodized to a hard finish. Both the housing and the chrome portion of the barrel are glare threaded and blackened inside to provide maximum contrast. The lens end of the barrel is threaded to accept standard filters.
$25.00 plus shipping. Paypal preferred, no fee.