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Deep space photography usually requires a significantly different OTA than one that will do the moon and planets (well).
For the planets, you want a long focal length newt or SCT, like a 10" newt or 9.25" or 11" SCT.
For DSO's, it's easiest to start with a short focal length refractor, like an ED80 or ED100. Of course you can use a C925 on deep space, but the long focal length highlights tracking inaccuries and the seeing starts to have more of an effect. For someone starting out, an ED80 would be a fantastic choice for deep space photography on that mount.
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