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Old 27-03-2015, 01:59 AM
Mosc_007 (Charles)
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Join Date: Apr 2014
Location: Sydney, Australia
Posts: 172
Quote:
Originally Posted by cometcatcher View Post
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.
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
Attached Thumbnails
Click for full-size image (Horse Head.jpg)
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Click for full-size image (Horsehead.jpg)
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Click for full-size image (Horsehead QHY10.jpg)
113.3 KB40 views

Last edited by Mosc_007; 27-03-2015 at 02:14 AM.
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