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It's just not accurate enough for the focal length of your newt. For deep-space stuff, you literally need no movement for many seconds at a time. The EQ platform has good tracking, but there is still slight movements during that time due to imperfections in the tracking run.
Also, EQ platforms track only in RA and most just have speed adjustment (faster/slower) and don't have any adjustment in DEC. So there's no chance to do any guiding, either manual or auto.
If you want to do deep-space photography, you need to get a big, solid EQ mount - a very large one if you want to put your 12" newt on it for astrophotography.
I have my 12" newt on an EQ6 but I only use it for planetary/lunar - not for deep-space stuff.
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