ED eyepieces in an Achromatic refractor?

[Oat]

Hi All

I have an ST80 achromatic scope. If I use ED eyepiece in it such as the BST starguider's will this eliminate (or massively reduce) chromatic aberration?

 

With thanks

[Ricochet]

No. Any aberration from the objective already exists by the time it gets to the eyepiece and so the eyepiece will show that aberration, plus any aberrations from the eyepiece itself. The only real exception to this is field curvature, where the curvature from a particular eyepiece may counteract the curvature from the telescope. 

[Oat]

1 hour ago, Ricochet said:

No. Any aberration from the objective already exists by the time it gets to the eyepiece and so the eyepiece will show that aberration, plus any aberrations from the eyepiece itself. The only real exception to this is field curvature, where the curvature from a particular eyepiece may counteract the curvature from the telescope. 

Thank you for your explanation. Its very much appreciated.

[Louis D]

The only thing known to correct achromats for color is the long discontinued Aries Chromacor.