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Great to hear! Glad to be of help and teach you a new skill ..... and save you money!

Dankie vir die interessante terugvoer. Wonderlike sorgvrye kinderdae!

Hehe! It sure looks like it hey!

Thanks for your feedback. Glad you enjoyed my video.

@@hcic9860 if the secondary needed cleaning, I would have done it the same procedure as the primary and corrector plate.

Yes, we live in the RSA, aka South Africa. Seeing that this "slipway" is the only way for excess water to go, it was indeed overflowing yes.

@@SterremanWillie Schpelling reBpublic? SPILLway. A dam fails if the water goes over the main dam wall.

@@joserivas2992 if expansion was the problem, that would haves solved it yes.

Great to hear my video was able to help you out! You surely saved some money, doing it yourself.

Thanks, glad you enjoyed the video.

Indeed, but because that will show the true shape of the earth, flat earthers declared that space if fake!

@@SterremanWillie yes, I know. But... debating a fool makes 2 fools. The ship in the distance surely is not because of the curve. They always think of an excuse.

They are not quite identical, but they are used for public outreach, so can be pointed to two different objects when doing public stargazing.

@@SterremanWillie Apparently these are 16 inch telescopes. Can you tell me what maximum magnification you get without image degradation ? Can you send me a photo of Jupiter or Saturn taken with your instrument ?

@@sergedannywilde1987 The one I first cleaned (not shown in the video), is a Celestron 14-inch and the one in the video is a 16-inch Meade. I never tried to push the magnification since there is no point unless you want to do an experiment - one can actually see more with less magnification. I only have footage of a Lunar/Saturn occultation taken through the 14-inch, by handholding a video camera at the eyepiece - see ruclips.net/video/K98eWv3s0z4/видео.htmlsi=m23mJEm8Gv4kkrKw

@@SterremanWillie Images spectaculaires ! Merci pour cette vidéo ! Je demandais ça car je viens d'acheter un Célestron C8 et je n'obtiens pas grand'chose pour l'instant...Images floues dès qu'on les grossit un tant soit peu...

@@sergedannywilde1987 start by checking/correcting the collimation.

Thanks. Great to hear you liked it!

Good question. These methods were af course not dreamt up in one day, but would have been developed over time. Obviously lots of failures first, until the process was refined. Thanks for watching and your feedback.

Yes, 60-plus-year-old technology, still in good working condition. Indeed, water is your greatest hurdle to get good vacuum! Interesting about the argon backfill at the roughing stage still! I guess it is like flushing out some water? Or is the backfill during the turbo-pumping stage?

@@SterremanWillie Flushing with Ar is done during roughing to "sweep" out water vapor. This was my experience in UHV system for a electron spin resonance cryostat for liquid He service. Much smaller than NMR cryostat so superinsulation doesn't work..critical diameter etc.

At 40 km the tilt would only be 0.36 degrees, so not discernable, especially as the tilt is away from you instead of sideways.

@@stoutgat7 I don’t believe you can simply say it would be discernible, if we are watching the ships disappear due to the curvature we must also observe them tilt away at the same time they are disappearing also due to the curvature

@@user-kn1yc6pu5h it's not a matter of belief, it's a matter of drawing a picture and doing basic trigonometry. I'm sorry you're having a hard time with this.

@@stoutgat7 so the ships are never plumb or any buildings for that matter?

@@user-kn1yc6pu5h a building is plumb where it stands. It is not plumb in a place where it doesn't stand.

Thanks for your comment and for watching my video. Peace2

Thanks. If you listened to the narration, you will hear what the problem was. In my follow-up video you will see how we fixed it.

@@SterremanWillieah I think I missed it because I had trouble understanding you. I still don’t understand why you couldn’t shift the door opening over. It’s just studs and a round building. But very interesting video and quite fun to observe it being constructed by hand and so few people.

@@srpheavyindustries888 It was an interesting set of events. The owners oof the dome realised the day when the concrete work was done, that one of the supports for the top floor falla accross the doorway, but due to the 12 hour time difference between Hawaii and South Africa, the message got delayed. It was also a few days before Covid deep lockdown. But was easily solved in the end.

Yes, because they are launched together, they all got the same momentum in the same direction, hence the same orbit.

Amazing hey!

Not really, you must remember the layer per coating is about 10 microns, hence after 100 firings, its only 0.1mm thick!

Indeed, Google "oil diffusion pump". The roughing/backing pump is equally interesting - Google "rotary vane pump" - there are several intimations on the internet.

@@SterremanWillie ty I'll research it. Was that 10^-4 bar ? before Aluminum atomization?

@@das250250 no, we pumped to 2x10^-5 mbar finally.

Thanks for the remarks. Good question about the secondary, probably because it is well sheltered, so keeps clean by itself. I assume you watched some of my other videos showing the other telescopes at the Sutherland Observatory.

Thanks, glad you liked it.

Thanks for the great feedback, glad you enjoyed my video. Good to hear you considered me a "seasoned craftsman", but I must confess, this was only my second time doing a SCT, although I have been around optics for some time. I learned the theory of what to do from our optical people at the observatory, which gave me confidence what to do. My "reward" was a comment from an ex-Meade employee which confirmed that I got it right, dispite other "experts" being quite critical as you can see from the comments. Good luck with your cleaning attempt, its not that difficult.

@@SterremanWillie Yes sir you showed me exactly what i needed to see. Well your confidence and demonstration was all i needed, you're a natural then with (SCT). Thanks again!!!

Thanks for the nice feedback. Wow, it sounds really interesting what you guys do. It would be wonderful to see a video, hint, hint!

Unless you want to design a gadget that needs power, just a simple weight and float will do. Place it such that you can see it from the house, or where ever, it is visible from a fair distance. Happy building!

Glad you liked the video.

If that was true, one would expect it to shrink in size, like any other object moving away from you, due to perspective. You can easily test this for yourself - using a solar filter, take a picture of the sun at noon and again at sunset/sunrise, using identical settings. Then compare the two pics side by side. I'll be looking out for your video.

@@SterremanWillie it does

@@rmelnyk3986 nope!

@@SterremanWillie False. We see in an atmohemispheric dome of vision, the sun we see never changes it's distance from us, therefore it would not be expected to change size drastically. It definitely has been shown to be slightly smaller though

@@SterremanWillie Excellent work mate. Flat Earth psy-op has confused so many.