STEVE’S TOP TIP

Sky at Night Magazine - - SKILLS -

What is an ED eye­piece?

and Eye­pieces con­tain sev­eral lens el­e­ments types of glass these are de­signed us­ing dif­fer­ent false to cor­rect chro­matic aber­ra­tion – un­wanted colours, ha­los and colour fring­ing. good at One type of glass that is par­tic­u­larly as ED re­duc­ing chro­matic aber­ra­tion is known and glass. ED stands for ‘Ex­tra-low Dis­per­sion’ of glass lens el­e­ments made from this type of fo­cus re­duce the dis­tance be­tween the plane to pro­duce of the var­i­ous wave­lengths of light with one a more sat­u­rated im­age. Eye­pieces more ac­cu­rate or more ED lens el­e­ments pro­duce than colours, with less chro­matic aber­ra­tion nor­mal eye­pieces.

STEVE RICHARDS is a keen astro im­ager and an as­tron­omy equip­ment ex­pert

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