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Secondary mirror keeps tilting and not staying in position after first attempt in collimation.
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By BenR
Hello
I am new to astronomy, and recently purchased a Celestron Starsense Explorer LT 114AZ, and just for a start, I used the finderscope to locate exactly a random star, and I looked through the eyepiece and just saw a blurry white image. I was using a 25mm eyepiece lens, and then decided to put on the 2x Barlow lens with the 25mm lens, and nothing changed. Is this normal? What should I do to improve?
Thanks.
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By Northernlight
Hi All,
Just wondering if anyone out there had upgraded their secondary spider to use one of these CNC secondary cells ? just looking for some feedback to see how much of a difference they make - primarily interested from a collimation perspective, but also interested to see how much it impacts your diffraction spikes.
Cheers,
Rich.
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By jonathan
Hi,
I'm collimating my Skywatcher 150p reflector and have got so far with aligning the secondary according to AstroBaby's guide, however I seem to be at a conflict with the positioning in the focuser tube. It looks to be aligned up/down the main tube, but not left/right (looking into the main tube from the open end) or up/down when looking down the focuser tube with a collimating cap on.
i was told to align the secondary to the middle using the spider vane adjustments, but I can't see any other way to move the mirror than to adjust the spider vanes, which would result in the secondary no longer being precisely central in the main tube. Am I missing something? I hope these photos explain it better. To my eyes there seems to be clearly a larger gap at the bottom than at the top.
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By Corpze
Hi, I know that there has been a couple of threads on how to collimate a newtonian, more specific, how to center the secondary mirror under the focuser.
I bought mine "Concenter eyepiece" for almost a year ago and can't praise it enough - it makes centering the secondary a breeze.
Have anyone else tried this? What is your opinion?
I have also read that some have questions of how accurate it is? - I might not know the answer to this question, but what I do know is that after I have been centering the secondary with the Concenter eyepiece, I finish of the collimation with the Catseye XLKP and Blackcat. The small adjustments I have to make of the secondary after adjusting it with the Concenter eyepiece tells me it is very accurate. It is just the absolute finest adjustments i have to make afterwards.
I have made a video of how it works and how it looks like when I am collimating my scope. (10" f3,4 astrograph)
Best regards, Daniel
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By STOCKPORTRICO
Hi everyone, I am almost new to Astronomy - I currently have a Powerseeker set up but my mate has given me a konus digimax 90 he has lost the tripod can anyone advise me of a replacement tripod - I have a Go-To altaz mount I dont have a compatable Tripod I just want a cheap one. any links or any advice to get a tripod would be amazing - thanks in advance (im in the uk)
Rick
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