3.5 hours on the Great Nebula in Orion. This is the whole sword area. Shows some of the dark nebula also. Here are some answers to questions about this photo. I used a 66mm APO telescope on a Celestron Goto mount. I used a second telescope on the same mount to "auto guide" the image. The camera was a Canon 350D I changed the IR filter to allow more of the near infra red light to reach the chip. This involved taking the camera apart.
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