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payload capacity is the main one.
HEQ5Pro can handle around 13.5Kg whereas the EQ5 is recommended to have a maximum of 11Kg.
The NEQ6 is much stronger but more pricey. I wouldnt load anything more than my 200mm newt and the orion mini guidescope on mine, even so, I had to buy a third counterweight to make sure it balanced properly.
HEQ5Pro is deemed to be the minimum starting point for Astrophotography here on IIS by many
Cheers
Chris
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