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If you look at the original thread you will find Hiro's longest exposure was 28 minutes!!!! at 1600 ISO at f/5.6 with a 24mm lens. He is realy picking up the dim stuff as he is using a modded Canon 5D MII.
The longest I can expose for with even an LPR filter is about eight minutes at f/5.6 at 1600 ISO due to light pollution.
The dim stuff is real and I suspect if you overlay HA or radio images from monatomic Hydrogen the stuff between the Magellanic clouds would closely match in intensity and extent. The unresolved dim stars gravitationally drawn with the monatomic Hydrogen gas are also 'visible' as the greenish areas.
Bert
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