Re: [ATM] Non Achromatic Eyepieces

[Anthony Stillman <atmer@flash.net>]

>...special eyepieces to correct secondary color

The farther the correcting element is from the abberating element, the more
difficult it is to correct the abberation.

Correcting secondary color half or so way down the light cone is quite
do-able.  Roger Ceragioli has done some work in this area and reported it.
Here are links to a few of his postings.  I'm sure I remember a post where
he described a working telescope that he'd made, but I couldn't find it.


<http://astro.umsystem.edu/atm/ARCHIVES/FEB00/msg00691.html>

<http://astro.umsystem.edu/atm/ARCHIVES/FEB00/msg01348.html>

<http://astro.umsystem.edu/atm/ARCHIVES/FEB00/msg01352.html>

<http://astro.umsystem.edu/atm/ARCHIVES/FEB00/msg01404.html>

<http://astro.umsystem.edu/atm/ARCHIVES/MAR02/msg00539.html>



Anthony


reddite quae sunt Caesaris Caesari
Give back what things that are Caesar's to Caesar.

(Render unto Caesar what is Caesar's.)

In Latin all "c" -s are hard.  Brings new meaning to what the Prussians
thought of themselves.





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