|
John,
It may also help you to take some dark frames - cannot remember if the Sti does this automatically?? etc - I use a Loadstar with an OAG and PHD2 and use 0.5 or 1 second exposures - from a dark sky with a 12.5" never have any issues getting a guide star - getting dark frames reduces the noise even further.
As the other guys have said, get the focus right - move the Sti up and down in the OAG barrel - does not matter if the guidestars look like seagulls either. If this is annoying you, then with most OAG's you should be able to rotate slightly the prism to reduce this affect.
Are you taken images from Melbourne or from a dark sky? Light pollution would also be an issue with fainter guide stars.
John K.
|