I just re-read this. Joan, you are too funny. ;-) Nothing that would explain the difference in filters, at least until I see a lab printout of the spectral bandbass of each filter. I'm sticking with the blocking characteristics of each filter, rather than the bandpass characteristics. Especially considering the aperture they were using. Contrast is everything when you are observing H-beta visually. And I would add that young eyes are the biggest advantage. Sucks for us. On Tue, Feb 21, 2012 at 5:57 PM, <jcarman6@q.com> wrote:
I would like to add from a different point of view (odd little pun there) reminding ever yone that the horsehead is backlit. The stars behind it are relatively young and could be putting out more energy across the EMS, including t he 03 band. Then again, you also said the stars were twinkling - so maybe it was more atmospheric scatter on the earth end. Maybe a combination of both.