STEVE’S TOP TIP

Sky at Night Magazine - - OCTOBER / SCOPE DOCTOR / SKILLS -

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.

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