In article Y0rHb.47971$hf1.15500@lakeread06, says...

What would be causing this? Is this coma?

From http://www.opticalmechanics.com/about_coma.htm it sounds like it is coma
EXCEPT that it does not seem vary across the field. When looking at
The Pleiades for example, all of the stars in the system have this same veil.

Glenn again