ASTRO: 7 hours of halpha in SH2-101 at f/12.6

this is starting to shape up. Stefan is right: it is faint. I hav 7 hours of
Halpha binned 2x2 in a big pixel camera (12 micron pixels) with high QE
(~60%) and a reasonably high throughput Halpha filter (7nm @~90%
transmission)

I used the stinger 450mm classical cass at f/12.6 for this one: F=5760mm

Guiding was using the Lumicon Giant Easy Guider without the reducer.

http://www.narrowbandimaging.com/sh2...er_ha_page.htm