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for planetary no, you can just guide by hand. but for DSO AP, an eq mount is essential. You can get away with 3-5 sec exposures just pointing you dslr at the sky and stacking them for a wide field image.
trust me when I say that getting into AP isnt cheap. You could get away with an OK beginner setup like I do for about $3000 if you can find alot second hand. Shoot me a PM is you want to know more about my rig, as I'm a bit of a beginner too.
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