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By Gary Shaw
Hi All I’m considering purchasing an 8”aperture, f3.8 newtonian ( primarily for EAA) from Orion UK and would appreciate any input or feedback from anyone familiar with the product, the company or the purchasing process - and how to assess the compatibility with my current cameras.
This is would be a step up from my current equipment and entails selecting components that I’ve never used and know little about such as a rack and pinion focuser and components (ACU-3L), and coma corrector (Wynne Corrector). I’ve added links to these items below. I’m also feeling unsure of how to mate up my Zwo 178 and 294 cameras to the 3” focuser and whether there will be an acceptable match between the scope optics and my sensors.
I’m sure the folks at Orion UK will assist with all this but I’d sure welcome input from the Stargazer's Lounge community before starting the dialog with Orion UK.
thank you in advance for any help you can provide!
ACU-3L Focuser selection Info: https://www.orionopt...sers.html#ACU3L
Wynne Corrector selection Info: https://www.orionopt...torsfittin.html
I'm trying to figure out the cause of these weird star shapes I'm getting with my 130pds. I had them before, but someone narrowed it down to being pinched optics. So I loosened the primary retention clips, which seemed to fix the problem. Now that I've been able to get back out for another night of imaging, they seem to be back again! I made sure that the primary retention clips are still loose - should they be touching the mirror or not? I've also made sure that the primary collimation locking screws aren't done up too tight as well. Collimation through my cheshire looks to be spot on to me. Here's my image of Andromeda with the odd stars in question:
I have a Celestron Astromaster 114 eq (114/1000mm), and I do use it whenever I can, but I'm still quite the newbie when it comes to observing.
My point is, I'd like to observe the planets, but I dont't think the standard eyepieces that came with my telescope (10 mm and 20 mm) are powerful enough for that. For reference, the "furthest" I could see were the rings of Saturn , but they were very small and faint too.
Are there any specific eyepieces you could recommend? :) And of course, any tipps and advice are also very much appreciated.
Hope someone with more experience than I, which basically means anyone that has successfully collimated a Newtonian, can answer a couple of compound questions I have based on my first and only attempt at secondary collimation of my SkyWatcher Flextube 250.
1) All three of my secondary collimation screws were extremely snug before I did anything and I was only able to comfortably turn them counter-clockwise. Is this normal? Do I need to loosen all three screws first before I can properly start collimation? Should I be turning any screw beyond "snug"?
2) Before collimating, I placed a yellow sheet inside my OTA opposite my focuser tube and I placed a red sheet between my secondary and primary. The view this gave through my focuser tube was of a red circle surrounded by a partial yellow ring (the secondary mirror stalk blocking a portion of this yellow annulus). While independently turning each of the secondary collimation screws counter-clockwise I looked down the focuser tube (both with and without a sight tube installed) expecting to see some change in the shape of the red area (more or less circular) and/or the yellow area (less or more even thickness). I turned the screws no more that 2 complete revolutions. I did not perceive any appreciable difference in what I saw and I turned each screw back (clockwise) to their original tightness before working with another of the screws. Does it make sense that I didn't perceive any change? Should I have turned the screws more revolutions? Should I have loosened more than one at a time?
Very confused and looking for your help. Thanks
Hi! I am very new to SGL (just signed up a couple of mins earlier) and to astronomy as well, though I have been facinated with celestial bodies since I can remember. I recently purchased a Celestron Powerseeker 127EQ but now I’m having troubles using it and I can’t seem to see anything through it. I also have a Celestron collimating eyepiece but I still can’t seem to make it work. Anyone here who has experience with the same scope? Would appreciate if we could chat a bit as I would be really interested in your experience and how you ultimately made it work!