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I purchased a used Celestron Nexstar 102 SLT optical tube assembly (FL=660mm, Aperture 102mm, f/6.5) and mounted it on my Astrozap mount. This OTA has a thread that allows to connect SLR cameras via a simple T-Mount. So I connected my Canon Rebel XT (350D) and took a couple of images. Here is the Ring Nebula (M57). It is a stack of 13 images (30s each) for a total exposure time of 6 min and 30 sec. Processed in DeepSkyStacker and post-processed in Nebulosity. The focal length of the 102 SLT is not enough to capture enough detail of M57. However, the ring structure is clearly visible. Taken on November 15, 2011.
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