Off-axis guiding with coma

[StuartT]

I use an OAG with my Edge HD 9.25" and am seeing some rather elongated looking stars in the guide camera. I assume this is because I am out of collimation and the OAG is obviously looking at the edge where the problems are most marked.

However, my guiding is consistently good (<0.5") so I guess PHD2 is still able to calculate a centroid fairly reliably and use that to determine guide pulses. So maybe this doesn't matter all that much for guiding?

Anyone have any thoughts on that?

[Elp]

I've read you can guide on oblong stars though on a personal comfort level it doesn't seem ideal.