ED vs APO Refractor Telescopes!? FPL-51 vs FPL-53 vs FCD-100!?

Are you getting confused by the different types of glass used in refractor telescopes that are available today? Well, I was too so I did some research. The biggest challenge when building refractor telescopes is to reduce or completely eliminate chromatic aberration which creates 'false' colors when observing or photographing the night sky. In order to do so, good quality refractors use extra low (ED; FPL-51/FK61) or super-low dispersion (SD; FPL-53/FPL-55?FCD-100) glass types. Low-dispersion glass is paired with two or more other glass elements to reduce or eliminate chromatic aberration. The number of glass elements, as well as the type of spacing used, and the build quality of a refractor telescope, ultimately determine whether the telescope is truly free of false color (apochromatic).

Read my somewhat more serious blog about this topic here:
https://astroforumspace.com/ed-vs-apo-refractor-telescopes-fpl-51-vs-fpl-53-vs-fcd-100/

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