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Old July 11th 08, 06:35 PM posted to alt.binaries.pictures.astro
John N. Gretchen III
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Default ASTRO: 7 hours of halpha in SH2-101 at f/12.6

Nice fine detail there!

Richard Crisp wrote:
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





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John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3