9 comments on “Collimating the AT10RC

  1. I am collimating my 8″ RC (GSO) and have a question. Because the RC has two adjustable mirrors, the primary and the secondary, how did you know when you used CCD Inspector to adjust the secondary and not the primary?

    • Hi Craig,
      The need for primary adjustment is rare, at least according to Astrotech. However if that is needed the recommendation is to adjust it first visually using a cheshire eyepiece or similar, but according to the manufacturer the star testing should only require secondary adjustment. When I checked initially visually with the Cheshire everything looked spot on, so I just had to do some minor tweaking of the secondary with the CCDI software.

  2. When I received mine it was way out of collimation. The moon showed two edges. I think it happened during shipping. I looked around and found the DSI procedure and following it I ended up outfocusing a star and adjusting the primary. Then going indoors and using cheshire to adjust the secondary, then repeating the process.

    At the moment I have CCD Inspector showing a 14″ collimation but the image is showing round stars on the left and ellipses on the right. So I am not sure if this is a tilt of the primary or the secondary.

    My thought then was to use CCD Inspector multi stars to adjust the secondary which is in line with the DSI procedure to achieve ‘balance’ (or remove astigmatism). And use the single star adjustment to adjust primary, again similar to DSI procedure (remove on axis coma).

    But then reading a bit more in CI it appears that maybe I need to simply use single star and adjust the secondary.

    So this is where it has become confusing and I’m not sure what to do.

    • Hi Craig,
      Not sure what “DSI” procedure is? I sent you an email with a scanned copy of the collimation instructions I received from Astrotech. That’s basically all I did was follow that. Perhaps I just got lucky. You might start over again without looking at any astronomical object and just checking first visually, adjusting the primary first and then the secondary. Once it looks good visually then do the star test. I think the single star test is better than multistar in my experience.

  3. Pingback: Collimation revisited | daveandtelescope

  4. Just want to say a huge thank you for doing this guide. I finally solved my issues of collimation following this guide. My procedure started off by using the chesire eye piece, then the howie glatter to get the tipping plate aligned from the focuser to the secondary so the laser went back on it self, Then chesire again and then howie glatter with the holo graphic attachment with concentric circles to align the primary. Then I used ccd inspector following your guide and was spot on.

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