STEVE’S TOP TIP
What is a diagonal used for?
generally The eyepieces on Newtonian reflectors viewing remain at a reasonably comfortable pointing. But height irrespective of where they’re in altitude as refractors and Cassegrains tilt up making them their eyepieces get lower and lower, a diagonal harder to look through. This is where comes into play. A diagonal is a small triangular attachment, usually incorporating a small surface-coated the light mirror set at 45°. The diagonal bends 90° before collected by the telescope through simple projecting it into the eyepiece. This observe attachment makes it much easier to down into because now you can view looking the telescope rather that up into it.