That should give you an notion of how pricey the temperature-differentiating lens ingredient, germanium, fees to obtain and form. The 60mm incorporates a manual aim target; the other units have mounted concentration. Other science instruments on board Chandra are two transmission gratings, a sophisticated CCD imaging spectrometer, along with a https://infraredtelescope13331.blogadvize.com/34603375/infrared-telescope-can-be-fun-for-anyone