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Up until 2012, that's how I used to do all my astrophotography. For short lenses up to about 200mm they are okay, depending on the periodic error of the mount. I even added a guide scope with reticle eyepiece to track by eye. With that I could do a couple of minutes with an ED80, although it was tiresome and needed a lot of corrections. But for short tele lenses they are fine.
This is a pic of comet C/2014 E2 (Jacques) with my old Tasco mount unguided, 20 second subs with an EQ2 motor drive and 135mm lens.
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