From: Milton Aupperle <milton@outcastsoft.com>

Date: November 6, 2008 2:18:18 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Question about the focusing rings

 The Astro IIDC software is all about planetary, solar or lunar 

photography. Perhaps having a bunch of bright stars in the field screws 

up the algorhythm. Can someone advise?

It clearly states in the Astro IIDC Manual on page 64 that ""FWHM / HFD On"  method only works on SINGLE Star Like objects

Quote:

The "FWHM / HFD On" method is only designed to work with a single star like object and displays  the calculated "Full Width at Half Maximum" and "Half Flux Diameter" value.

And if Tool Tips are enabled, it also indicates this too as the help string for that meanu:

 "Calculates sharpness for a SINGLE STAR using Full Width Half Max and Half Flux Diameter."

So it will search for the brightest star, but if you have multiple stars in the FOV, it gets confused and may or may not find it.

Hope That Helps..

Milton J. Aupperle