Thought I would Update and Start a new Thread. <br /><br />Question 1, Does a Barlow extend the telescope focal length or does it divide the EP focal length? Exampel, a 2X Barlow will double the power of an eye piece 2X. If a 1200 mm telescope focal length is fitted with a 10mm EP, the power is 120. If a 2X Barlow is used, does this double the telescope to 2400mm/10mm=240 power or half the EP ( 1200/5 = 240 )? IF the EP focal length is cut in half, is the Exit Pupil also cut in half?<br /><br />Question 2. What is the best way to smooth out the Azimuth motion of a Dob. I have an Orion XT Intelliscope that moves a little rough in Azimuth. Orion suggested using Pledge Furniture Polish. Would a teflon grease work?