div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: APM Telescopes · 2014-03-23 · MIRROR MIRROR The primary mirror is centre-dotted for ease of collimation while the primary mirror cell has easy-to-adjust but lockable collimation src=https:reader034vdocumentssitereader034viewer20220504215f90e37ebbea615cf1740332html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: APM Telescopes · 2014-03-23 · MIRROR MIRROR The primary mirror is centre-dotted for ease of collimation while the primary mirror cell has easy-to-adjust but lockable collimation src=https:reader034vdocumentssitereader034viewer20220504215f90e37ebbea615cf1740332html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 3button div class=ts-image amp-img class=ts-thumb alt=Page 3: APM Telescopes · 2014-03-23 · MIRROR MIRROR The primary mirror is centre-dotted for ease of collimation while the primary mirror cell has easy-to-adjust but lockable collimation src=https:reader034vdocumentssitereader034viewer20220504215f90e37ebbea615cf1740332html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdiv