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Richard Combs
Приєднався 15 гру 2011
Відео
Collimation of Newtonian Telescope Part 1
Переглядів 63 тис.9 років тому
How to Collimate a Newtonian telescope. Part 1 of 3 parts.
Collimation Of Newtonian Telescope Part3
Переглядів 7 тис.9 років тому
How to collimate a Newtonian Telescope. Part 3 of 3 parts.
Collimation of Newtonian Telescope Part 2
Переглядів 20 тис.9 років тому
How to Collimate a Newtonian Telescope. Part 2 of 3 parts.
Using elastic bands to represent light paths is genius. Very intuitive.
Great simple but complete video! Thank you!
I’m a 49 year old with his first walkie talkie. lol. Anyway, great video on this product. I got these because when we go out on the lake or beach area I want to connect to the riders on my Yamaha Waverunner. I got tired, and afraid of loosing my phone in the water. Just got these in so can’t really comment on how they work. Any recommendations for us who will be using these on the water. Thanks again.
I've dropped these in the water to test. They float, the light turns on and just shake them off and they work. They are intended for water sports.
I stopped watching after the razor blade part......
Well technically that area is not going to be used. But yeah, razor blade and telescope mirror are two words that should never be in the same sentence 😂
Great video. I especially liked the tip about using a couple of extra washers to center the spider. My telescope is sporting two extra washers. Great tip. Thank you!
Great video Rich, I am glad it floats in the water. Does the radio charge via USB C or something?
You can charge by USB, I believe it is USB micro C, but it also has a two place cradle to charge two units, since it comes packaged with two units. It has rechargeable Ni-Cads which come with the unit, and also accepts 3 AAs.
Looks like a very nice radio!
My old Celestron Starhopper single stalk wasn't quite collimated so I used a thin piece of cardboard as shown and shimmed the focuser. Now the focuser axis intersects the secondary axis as shown in the video. I had to search my UA-cam history to find this video again. Thanks!
👏🏻 👏🏻
Curious what brands of EPs you all were using during this time frame and if you are still looking upward with any newer Newtonian scopes. Appreciate your dedication and detailed information on helping anyone who is struggling with understanding collimation. Cheers!
24mm Televue Wide Field was my favorite, and some short focus Televues for high power. My go to has always been a 10" f5.6 that I made, an awesome mirror. At the time I was making mirrors along with Carl Zambuto, who has gone on to ATM fame, way beyond my abilities. Was busy teaching others to build scopes which cut in to my making anything larger. Some day.
@@combsrichard11 thanks for the reply. I appreciate you sharing the details and some of your past experiences in the hobby. Its a passion that is enduring. I would agree that my favorite scope configuration is the 10” dob even though I own a commercial edition. I can only imagine the views through a custom made, perfect mirror setup such as the one you mentioned. Its amazing how consistent TV has been with producing quality EPs. They have been dialed in for decades now. My son recently purchased an Celestron 8se and its just fantastic to take them both out on good nights for a few comparisons. Recently ran into some terrific 82* eps from Astro Tech and they will give TV a run for their money. If you’re at a star party and someone has one, give em a whirl. Cheers and thanks again for sharing your knowledge. Be well!
Very informative and extremely interesting to see how some of those newts/dobs were assembled prior to todays offerings. The difference in how the secondary and primary mirrors were secured would definitely make collimation much more difficult. I have owned a 10” dob for a decade now and have been very impressed by how crisp the views are when collimated to as close to perfect as I see it through the cheshire. Add a couple of high quality EPs and off you go! I will say that i do my initial collimation with a laser and do a final check with the cheshire. Cheers and thanks for sharing this series! Clear skies to ya!
Thanks for your comments. Was fun to make the video, way back when, and the principles don't change. Rich
yeas ? 1901 ?
I now feel like a Collimation Master, thank you.
Do I get college credit after watching all these? 😁😅 Thank you for collimating ME!
What he failed to mention or make very clear after dropping the secondary mirror assembly down the 'OTA' or 'Optical Tube Assembly', was; "This will likely lead to primary mirror damage!", "Do not let this happen.", "Do this step in a horizontal or front/downward angle." Yes he does mention a caution warning.
I liked the learning by doing method here. The others show less info and are often just a visual overview of the process. - What he failed to mention or make very clear in 'Part 1', after dropping the secondary mirror assembly down the 'OTA' or 'Optical Tube Assembly!', was; "This will likely lead to primary mirror damage!", "Do not let this happen.", "Do this step in a horizontal or front/downward angle." Yes he does mention a caution warning.
Great old school vid 👍
Wow oldschool thanks for the vid.
Finally a Cheshire collimation explained!!! TY!
The monaural, sound in one ear, and the long-winded explanations tested my patience, but having made my own Dob, I can appreciate the things Mr Dobson didn't put into his design. I may go back and update my mirror cell.
Hey here's my handmade 6inch telescope lunar view---ua-cam.com/video/r165S9NAwMc/v-deo.html
Binford 2000 electric screwdriver...🤣🤣🤣
Can this man please be memed
Great information... thanks.
That stache tho
Love the music
Did you say Binford 2000 screwdriver? Home Improvement reference ..... no one catches it till me. Lol
Ron Yes HI was very popular...back when we made the video!
Im late to the party! Was just gonna give a shout out to the Binford reference. Nicely done and good catch👌🏽
@@hakksaw Me too!!!! Tool Time!!!
only my left ear listen
Cool informative and funny 😂
Video muy instructivo, las explicaciones paso a paso y claras para todos los que nos iniciamos en el mundo de la astronomia como aficionados. Felicitaciones
Excelente video, muy instructivo
Gracias
Newtonian telescope making in Hindi video video please
i did exactly what was done on 8:59, even without having known about this video.
Did they not have collimators in the 80s? Also I have alignment screws and markings for both mirrors on my newton
In 1977 a digital lcd watch cost around $2k. Now they're a buck or two. That was when a dollar actually had some value still too. Crazy expensive technology. Laser collimator...oh God. Just yesterday I called a guy about a used orion 6 inch reflector telescope that's around 20 yrs old. Asked about a collimator and he said, "you do it manually there's a procedure in the instructions". That was all I had to hear...click.
That decor...and that stache. This has 1977 written all over it. Well done vid though...hehehe
Close but I think you're a decade off. The proof is at 5:24. In 1977 if you bought a TV it didn't have a square screen like a monitor. That's 1980s I think. Just an opinion. Could be wrong.
@@mikeries8549 The hifi equipment + chunky watch makes me think maybe 1990s.
"This video will not collimate your telescope for you" Damn I thought it would 😑
cool
Burst into laughter at the 0:19 mark 😂😂😂😂😂😂😂
Best collimation video on youtube! thank you
Who says you can't bend light?
Me
This must be from the late 1980's, early -90's. The (lack of) video quality was the hint, but the moustache really gave it away ;-) Great vid, thanks.
Hernando In a typical 9 point mirror mount it is normal that one point of each three point triangle would be fixed to the mirror. I'm a little surprised that the factory uses double stick tape rather than perhaps a silicone adhesive, but that is their choice. There should also be some sort of non-contact guard over the mirror in case the attachment should fail. If the mirror is changing its orientation I would inspect the triangles to be sure they can rotate with minimal friction about their pivot point, and without any looseness. There are many other possible causes of loss of collimation, but to your specific question, I see nothing wrong with attaching the mirror to the 9 point mount at three, and only three, points, one on each triangle. ...Rich
Good morning Sir, As much as I try to find an answer to the following, I have not been able to find the satisfactory answer ... Apparently almost nobody takes into account that the primary mirror can not only suffer from de-collimation with respect to the secondary mirror; The primary mirror may suffer from astigmatism due to the movements caused by the weight of the glass, the size of the mirror, the triangular supports of the cell, the fixations of the mirror and the different temperatures in the observation environment. I have a 12-inch Newtonian f / 4 (TPO SKU: OS-12IN) and I discovered that the mirror was attached to 3 of the 9 points of the supporting triangles (that is, a point stuck by each supporting triangle). The telescope factory (GSO Telescopes) attached the mirror to the cell with double-sided tape. I have read in some forums and articles that it is better not to stick the primary mirror to the cell to avoid astigmatism but as I write, that mirror was attached to the support. I do not know if that is correct and in any case, in a telescope like mine that is not Dobsonian, but that is placed in a robotic-equatorial mount, that mirror moves whenever it is directed to an object in the sky and I find de-collimation even when it is attached with that tape to the cell. Do you know if it is better not to attach the primary mirror to the cell anywhere?
Great job! Right to the point. This is a big help
Thanks for the upload... I don't have a laser collimator yet so this was very useful. Also well explained and when you understand the concept you can collimator better.
This series of collimation videos are the best I've seen on UA-cam. They clearly lay out the principles; how to diagnose and finally how to collimate.
lol - agreed - alot of others leave alot out. Know how should be getting better not worse.
No fuss just good sound advice and instruction......Well Done.
This was produced in the mid 1990’s. Lots of new tech available now, but the principles remain, as well as the need for understanding the basics. Rich
Thanks for doing this. I'm an engineer, and pursuing curiosity managed to mangle the positioning of my secondary mirror to the point where following other youtube videos wasn't helping. This really helped me to understand mechanically what was going on inside my scope, and I'm hopeful that I will now be able fix it!
The best video on Newtonian telescope mirror alignment.
AWESOME.