By eHow Electronics Editor
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A Barlow lens is a negative lens that is used to enhance the focal length of the Sky-Watcher SK705AZ3 Short Tube Refractor Telescope. Greater focal length reduces the area and ensures higher magnifying power. The lens is named after Peter Barlow (1776-1862), a professor of mathematics at the Royal Military Academy at Woolwich, England. Here’s how you can attach the Barlow Lens to the Sky-Watcher SK705AZ3 Short Tube Refractor Telescope.