How to Use the Barlow Lens With the Sky-Watcher SK705AZ3 Short Tube Refractor Telescope

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.

Instructions

Difficulty: Easy

1. Make sure that all parts of the telescope listed in the manual are with you for assembly.
2. Insert the Barlow Lens between the diagonal and the eyepiece. In some telescopes, it can also be used between the focuser and the diagonal for higher magnification. When you insert the Barlow lens between the focuser and the diagonal, it converts a 2X lens to a 3X.
3. Refocus the telescope only after adding or removing a Barlow Lens or an eyepiece.

Tips & Warnings

• Refer to the technical specifications of the Barlow Lens before beginning.
• Use a Barlow Lens in combination with the normal lens to increase the magnification of the telescope.
• Use only special lens paper to clean the Finderscope and eyepiece.
• Do not clean the lens or any optical surface unless you are familiar with the correct procedure to be followed.

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