Re: [ATM] Another flat-field anastigmatic aplant

["vladimir" <svla@isp.com>]

Richard F.L.R. Snashall wrote:

> The quaternary (diagonal) is adjusted in position so that its
> minor diameter compared to the diameter of the secondary-tertiary
> cone at that point is equal to the ratio of the secondary to the
> primary -- again, some sort of "optimality".
>
> It works out well at this f/# with the image plane further away
> from the axis than the semi-aperture, and the CO being roughly
> only 27%.
>
> But, being that far behind the primary, the tertiary is nearly
> as large as it.

That tertiary is beginning to resemble a satellite. Guess it would be too
good to be true: a ~25% c.o. system with near perfect correction of 
aberrations,
good field size and usable on top of it. But seems that there are workable 
configurations,
with better allover characteristics in the "accessible image mode" than 
comparable Paul-Baker
based arrangements.

I just love that 0.5 micron spot 1/2 degree off-axis.

Vlad
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