LS60MT telescope with 2-lens ED optics For sun observation 60mm of the telescope's aperture is used and the focal length is 420mm. The etalon.Coronado SolarMax and SolarMax II hydrogen-alpha telescopes and filters are designed and tested to 9-10 SolarMax® II 40mm, 60mm and 90mm Filter Sets . User Manual for Coronado SolarMax II 60mm H-α Etalon with 30mm Blocking Filter Set · Product category: Solar Filters for Astronomical Telescopes Others · Brand: READ THIS MANUAL COMPLETELY BEFORE ATTEMPTING TO USE YOUR NEW CORONADO. PRODUCT. SolarMax® II 40mm, 60mm and 90mm Filter Sets . Meade Instruments Coronado SolarMax II Series User Manual • Solarmax ii 60 - double stack • Meade Instruments Optical devices. The Coronado SolarMax II™ from Meade Instruments introduces an incredible breakthrough in solar observing with the revolutionary RichView™ tuning system, Double stacked for 0.5Å bandpass; Sol Ranger finder scope; Comes with hard carry case. User manual: Coronado