Re: [ATM] Petal Laps, Star Laps,Starfish and other deformed creatures...

["lou krajci" <loukrajci@comcast.net>]

>From: Don Bates <dbates59@yahoo.com>

>...anyone had any thoughts about using
>so called "Star Laps". Many threads seem to extol the
>virtues of a star pattern to keep the edges from
>lagging behind the center. However, like a young
>student of Kung Fu, I keep hearing my master Texerau's
>warning, "Do not take lightly the condition of a
>perfectly mated lap, and deform it without a good
>reason, grasshopper".
>Is it really a good idea to jump out of a perfectly
>good airplane and deform the lap that I have so
>carefully cared for? Will I reach Parabola Nirvana or
>Hyperbola Hell?

Many ways to figure a mirror.  Star laps help with fast/deep/highly aspheric
mirrors.  While I've done a tiny bit of work with star laps (figured a six
inch f/3.75 hyperbola)...I prefer sub diameter laps if at all possible.

See:
http://overton.tamu.edu/aset/krajci/
specifically
http://overton.tamu.edu/aset/krajci/star-lap/star-lap.htm

For your size and f/ratio mirror...you probably don't need a star lap.

Tom Krajci
Albuquerque, NM
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