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a big fast scope like yours needs good collimation... it makes all the difference. on bright stars with my f6 i can get good.... hang about.
when you say bad bright star images, what do they look like exactly?
you could make an perture mask (dead easy) for viewing bright objects if this is a problem...
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Your comments make me think it's the collimation. Although I have aligned the secondary with a laser and barlow lasered the primary, I have not initially used a sight tube. The reason I have not bought a sight tube is I am unsure whether it will do the trick or if I need the Jim Fly set with the adjustable sight tube(help on this point would be great). Having said that, about two weeks ago I made the decision to buy the Orion from bintel but they had none in stock and suggested I try in two weeks. I think later today I will try again.
What do they look like? Very big fuzzy blobs.
The mask. I put held a piece of cardboard in front of the scope to test the water. It certainly helped in splitting the bright double I was looking at(I don't recall which). Without the cardboard I could see evidence of a double because the image I got was a slightly lobsided blob. With the cardboard I came much closer to actually splitting without splitting.
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