Quote:
Originally Posted by cometcatcher
Interesting comparison. That internal filter really cuts back a lot of light, so you gain almost an F stop by removing it (except in cyan) and much more in Ha.
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Certainly does. The filter blocks 90% of the Ha light. Removing it makes it 900% more sensitive to Ha.
Because it buggers the Colour balance objects with No Ha light still come out with much higher Red levels. Taking a terestrial Photo which contains No Ha light you get a huge Bias towards red. Pretty much useless for normal use. But perfect for Ha Nebula. Although the stars also come out Red.
I have attached two Images of the Horsehead Nebula. Pretty much a pure Ha Nebula.
The First is with the Stock Canon 1100D before modding. It was 5 Min subs.
The Second is after I modded my 1100D. And even with only 2 Min subs you can see how much difference it made.
Just for the Hell of it I also included my Latest Attempt at Horsehead with the C11 Hyperstar and QHY10 CCD.
Charles