OT I know


I always wondered why when Canon introduced the 20DA (Astronomy) that this was the first and last version. I now understand that this community has moved to use purpose built video cameras for their telescopes (some with a CCD cooler to reduce thermal noise). These are often cheaper than a DSLR and are designed to attach directly to the eyepiece. They then take a few minutes of video of the subject direct to a laptop and use software (freeware I understand) to compensate for movement and atmospheric changes.


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