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If u haven't got it get Ron Wodaski's CCD Calc program it's free and that will give u an idea as to how big your image will be. Even at f6.3 and pointing at Alnitak near the HH it will be just out of view. But with a 140mm lens at 60 secs i can just make out the HH with lots of stretching with an unmodified camera, so u should be able to see it with yours if it's in the image.
Marcus.
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