[ATM] additional lurie-houghton degrees of freedom

[vladimir sacek]

Ukyo Chen wrote:

> Hold on Guy, please let me know the radius data 
of every surface on every lens/mirror, maybe I can 
calculate another solution which doesn't need to go back<

The radii are posted in the initial post. Unfortunately, 
spherical aberration of the corrector can't be changed w/o 
changing the radii, nor it can be significantly influenced by 
either change in corrector location or lens inter-space. 
For any given mirror, and corrector glass/location, there 
is only a single aplantic solution. For this particular setup, 
it is (as I already posted)
 R1,3=+/-67.42" and R2,4=-/+175.96". 
Your corrector leaves in some residual coma 
(1/2.5 wave PV - comparable to 1/4 wave PV of s.a. - 5 mm off-axis).

L-H atigmatism is practically determined by the corrector 
location, in proportion to (1-s)^2, "s" being the 
corrector-to-primary distance in units of the mirror r.o.c.

While it doesn't mentioned it explicitly (I think), Richard's 
L-H calculator gives aplantic element radii on the push of 
a button - no need to calculate or fiddle with raytracing software.

Vlad