Datyson 3X Barlow Lens 5P9941C for 0.965inch Astronomical telescope Eyepiece

What is a Barlow Lens?
A Barlow is a negative (diverging) lens that is placed between the objective lens (or primary mirror) and the eyepiece of a telescope. It increases the effective focal length of an objective lens, thereby increasing the magnification. The idea is that 2 eyepieces and a Barlow will give you the flexibility of magnification of 4 eyepieces, and will give higher magnifications with less powerful eyepieces.

Specifications：
Brand: Datyson
Product No.: 5P9941C
Origin: China
Magnification: 3X
Lens material: optical glass
Product material: plastic
Interface size: 0.965 inches （24.5 mm）
Product size: 170 * 35 * 35mm
Net weight: 43g

Package Include:
3X Barlow lens * 1
Dust cover * 2