Hi John,
I agree with Slawomir. After trying a bit a around with my EQ6 and finding that everything beyond 2min on 600mm was unuseful material, I went ahead and bought a guider (SSAG). It opened up 6min exposures on my mobile setup with nice round stars.
PS: when I set up I use a builders spirit level for the tripod and then the polfinder scope to pol-align. PhD does some DEC guiding but I haven`t noticed any issues with stars being not round at both 600mm and 750mm.
Cheers,
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