From: "jimchung2338" <jim_chung@sunshine.net>

Date: February 8, 2010 8:12:01 AM MST

To: Astro_IIDC@yahoogroups.com

Subject: Sunday Sun Day

I was out enjoying the Sun probably at about the same time Alan was, only I was on the other shore of the Lake Ontario.

The seeing was very occasionally fleetingly good and I got my first good sunspot capture as shown here:

http://tech.groups.yahoo.com/group/Astro_IIDC/files/Solar/Sunsportcompared.jpg

Here's my question which Milton will undoubtedly address.

The images were stacked with Lunar-Solar alignment, 64x64 pixel comparison area and horiz and vert fine alignment.  I also stacked with a 6.5 variance per pixel.

What I found was that AstroIIDC had a hard time accurately assessing the sharpness levels of each frame.  Oh, and I successfully cleaned the CCD so absolutely no dust motes remained to confuse AstroIIDC.

On the top, the left is 200 images/1500 stacked and on the right I hand selected about 100 frames and rejected another 100 that were undeniably blurry.  You can see the right side is noticeably sharper.

On the second row is the same sunspot but with the etalon tuned past the Ha wavelength.  Again the left is 200 stacked images but the right was only about 40 hand selected images - the rejected ones were very blurry.  The right side is significantly sharper than the left.

Each pair of images underwent identical PS sharpening.

Any insights?

Jim