Re: [ATM] Turned Down Edge

[Michael Lindner <mikell@optonline.net>]

On Wednesday 14 July 2004 07:48 pm, Jim Burrows wrote:
> At 2004-07-13 21:20 -0400, Michael Lindner wrote:
> >If you never touch the edge, but deepen the center, you are, in effect,
> >turning the edge (without touching it).
>
> Not if you consider changing the best focal length.

Jim, I think you misunderstood my intent. If you deepen the center, the 
difference in focal length between center and edge increases. Relative to a 
best fit curve, the edge appears to turn down "by magic" (e.g. without being 
touched by the lap). Yes, you can change the curve to one that isn't a best 
fit, but you're still moving towards hyperbola land in reality, becoming more 
and more frustrated as the edge continues to "turn" while you're avoiding it.

This IMHO is why TDE is such a big bugaboo. TUE is easy to fix. You put the 
lap on it and it comes down. TDE will not come down if you avoid the edge.

Clear skies.
-- 
Michael Lindner
http://www.starastronomy.org *** http://home.att.net/~mikel
http://www.atmsite.org *** http://www.atmlist.net

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