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Hi all,
Thanks to everyone for your replies. Ausastronomer your detailed response was greatly appreciated and very informative.
Janoskiss asked how the GSO plossls are performing. The image I get at the moment is poor but I think this might be the collimation rather than the eyepieces. At the moment if I look at bright stars with the 9mm they have a big blob around them. When I look at Beta Scorpius the blob goes around both visable stars. An out of focus star is assymetrical. Wavelandscott suggested a cheshire collimation tool. Unfortunately before I read this advice I had already ordered Celestron's Simple Collimation Tool. Since the total price including postage was $28 I could always buy something better without feeling too wastefull. If I do buy better there is the Bintel Laser Collimator Deluxe for approx. $130 or the Orion Collimating Eyepiece for approx. $80. Any comments?
On top of this I have coma towards the edge of field(as expected in the f/4). I might need one of those paracorrs but for now I will leave it. Will the coma improve with good collimation or are they not related.
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