Star Test Result

(PatDotson) wrote in :

I get a decent concentric pattern at outside focus, though a little
over-corrected. But on inside focus, the image falls apart badly.
This situation isn't covered on any web sites I've found. Is there
anything that can be done to improve the result?




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What sort of scope? Valery Deryuzhin or Aries Optics had a corrector
called a SAFIX, you could specify the amount of over/under correction of
your scope and order the matching SAFIX to rectify the problem. I think
it was intended for SCT's. They also had a thing called a Chromachor
which could fix both spherical aberation and chromatic aberation for
achro refractors (The chromachor cost more than the achro OTA but
probably still cheaper overall than a genuine APO refractor).

Rgds Llanzlan.