My 3 Laws Of Telescopics to Get Sharp, Clear Telescope Views!
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- Опубликовано: 2 июл 2024
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Follow my three simple rules or Laws of Telescopics - to banish disappointing fuzzy, blurry eyepiece views with your astronomy telescope.
With apologies to Isaac Asimov and I, Robot's three Laws of Robotics - this video is about my personal three rules or laws, not of Robotics, but Telescopics. I, Robert's Three Laws of telescopics to avoid fuzzy, blurry eyepiece views with your telescope!
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00:00 Tiny planet man's ladder
01:07 Fuzzy, blurry eyepiece views
03:39 The "Energy Blob" planet
04:06 Let's talk about "nothing"
06:54 The First Law
07:30 In praise of mirrors
09:22 Schlieren imaging the mirror
10:19 Out of the frying pan...
12:24 "Smoking" mirror!
14:45 My First Law stated
16:05 The Second Law
25:39 My Second Law stated
26:34 The Third Law
27:10 My guides
27:49 My first telescopes
31:11 My Third Law stated
33:40 Data sources
36:19 Thinking caps on...
36:55 Videos of seeing episodes
38:48 Adding to your observing log
39:13 A star test
40:15 Our lovely sponsor, Brilliant
41.33 Our special offer
41:50 Thanks for watching
Followed by end credits.
Special thanks to Damian Peach for allowing us to use his library of videos showing various seeing conditions. Web: www.damianpeach.com/
This video was sponsored by Brilliant.
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Presented by Robert J Dalby
Produced by Astronomy and Nature TV 
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Hi Robert. All very good information. I would add a forth law. That of stability. For those starting out, something as simple as taking your telescope from a wooden deck that is connected to the house and setting it on the ground can make a big difference. Someone walking in the house can setup tiny vibrations in the scope. The same can happen even with a slight wind, so maybe think of some shelter from the wind. And make sure the tripod is set up correctly. If it has a spreader bar, make sure it is seated properly and tightened down.
Great video.
Take care,
Steve.
Robert is so engaging. I love the material that he presents but, to be honest, I’d happily spend hours listening to and watching him discuss absolutely any subject. I love the humorous interjections too. More please.
Absolutely great to see you back, you still have a brilliant way to educate. A most informative video. 👍
Totally agree, I miss so much my favourite astronomy channel!!!!
And so say i .
I’ve been a subscriber for many years and this is probably the best video you’ve put out. Really terrific work and your passion for the subject is infectious.
Great to have you back again ! Hope you are in good shape :)
Waiting for more rocket engine analysis ;)
It would be awesome if you could start analyzing other rocket powerplants and systems besides v2 as well !!!! Fingers crossed
Sooo glad you’re back with a new video !!!
My planet viewing always improves after 30 minutes of being outside. I love those rare excellent viewing conditions when Planet details pop out and double stars are easier to split. Great well thought out video.
Wow, the clarity of your messages is amazing. Will totally take all of your suggestions to heart. 👍
So good to have you back with new Astronomy content! I owe you my first steps on Astronomy 3 years ago. Cheers from Brazil
Thanks for showing how important the cool-down is.
WOW !!!!
This is an excellent demonstration of what is happening inside our Telescope 🔭.
A note on the ‘first law’ I found that by insulating my 6” Maksutov it made a big difference to its performance.
Seeing permitting, i’m able to use high powers straight away. No more waiting for the scope to acclimatise to the outside temperature. To anyone with a closed OTA (Mak, Mak-Newt, Cassigrain) it’s worth trying out. It’s not costly and it’s relatively easy to do. There are several articles online that explain.
Great to see a new video by you Robert! And I've only watched the hysterical intro so far, but am really looking forward to this.
Now that I've watched it, I am reminded how much I like the simple way you illustrate and present this material. Bravo! More please.
Yay!!!!! You’re back! Hope all good. This channel was so important to me as a newbie… wisdom in every video.
Really enjoyed this video. I watched your older videos when I first started astronomy five years ago. 3000 observations and five telescopes later, you still have plenty to teach me. I really liked the demonstration of the heat waves coming off the mirror. My 10 inch definitely can give off some heat for an hour or so and the views always get better after I have been observing for a while. Also agree nothing beats understanding observing conditions like observing. After looking at Jupiter multiple times a month, it just takes a single glance to see if it is average, above average or poor. Thanks again!
Great to see you back, doing astronomy videos again! Very informative Master Class even for a somewhat seasoned astronomer. Looking forward to your next offerings. CS.
Glad to see you again!. I bought my 10” SCT from you 16yrs ago and it took me quite a while to learn some of this.
Robert, you are wonderful teacher. Thank you so much.
Very interesting, think I’ll get that old reflector down from the attic and give it another go. BTW, should you be suffering from an upset stomach you may wish to make sure Anna is not putting a few drops of that carbolic acid onto your breakfast. 😊
Great to see you back, and especially on an Astronomy topic too.
Great video, thanks for the clear explanations and demos.
Absolutely fantastic video. The atmospheric elements were mind blowing. You’ve got such a gift for putting things in perspective.
Welcome back, long overdue! Awesome and informative video!
Excellent video on good observation habits!!!
Top subject and very well explained Robert. After some experience, a learning astronomer can judge the night sky by just looking up and seeing how the stars look. A good night will have bright stars with very little twinkling. There are some occasions when mist may be present but the image is not compromised apart from just being a little dimer. I look forward to your next video, you really do have a talent for astronomy and have helped many people develop an understanding of their equipment and the universe it was made to observe. Thanks Robert, all the best from Australia. Ian.
Thank you Robert! What a great video! Glad to see you back! I went out observing today ( from 20 degrees in the house to-13 with wind chill outside) let the eyepieces and telescope (81mm) cool down for an hour, on my third floor balcony, heat radiating off the buildings all around me, both moon and Jupiter almost impossible to focus on…. Air turbulence, poor seeing, but still a pleasure, looked like a transit of one of Jupiters moons, actually did a star test on Betelgeuse (at about 35 degrees) nothing doing, thank you for stressing the importance of rule #3! Hi from Montreal!
This is excellent. Well done!
While attempting to collimate an sct on a de-focused star I placed my hand in front of the corrector, to gauge adjustment direction, and saw storms of heat coming off of it. It was kind of mesmerizing, but on removing my hand I noticed a flat spot on top of the image that, with further de-focusing, became larger and more U shaped while also repeating to a smaller extent around the entire edge. With a little more knob fiddling and scope jiggling I quickly understood that I was looking at a pool of warm air floating in the top of my optical tube… and that my collimation efforts should be held off for a bit.
Glad to see you around again!!
YES. Can’t wait to curl up with some food on the couch and watch this. Thank you Robert!
This is such important information, Robert! Thank you for putting together a truly outstanding presentation. I've 'deviated' (pun intended) into astrophotography for the past year or so and mainly doing that, but all this makes me want to take my dob out and re-experience the thrill I've always gotten from plain, old, visual observing under the stars. Thanks again for the terrific should-be-required-viewing information -- and the inspiration! This honestly was one of the best RUclips videos I've watched in quite some time.
Top content. Thank you for putting the effort into this very informative video.
Excellent video full of really good advice. Thank you.👍
In reference to rule #1: What about refractors and dew heaters? Placement? Above the lens, on the dew shield, or below the lens on the OTA (as near the lens as possible)?
Absolutely outstanding video!
A very good video! Thank you.
Well thought out well explained video.
You’re Back! That is Brilliant!
A very educational video, every observer should watch this! Great stuff 👍
Well i, Robert... i LikedIt! What a great video and so good to see a new video!
Live and learn I love this content Robert🤙🏻
Good video for beginners. Newtonian telescopes: I used to make telescope mirrors for different companies and so I feel a 1/4 wave mirror isn't good enough. Maybe a 1/8 wave reflected wavefront is satisfactory if the mirror is smooth. Next, I've tested secondary mirrors and have actually taken some and thrown them in the garbage because they were so awful. These bad optics were imported from the orient. Japanese optics are probably better. Schmidt Cassegrainian telescopes have 5 optical surfaces if you count the star diagonal.
That's a lot of glass for the light to contend with ! Last: Nothing was said about observing near a wind turbine. What ? Yes. The seeing is extremely poor if you're downwind from one or more of these. They create a vortex of tumbling thermals. Fine detail, forget it.
Hi.
So, I have been following 2 of your laws and they all work fantastic. However, the problem is that when I leave my telescope out for cooling the mirrors, dew forms because of high humidity. So, my question is when is an ideal condition to take out the telescope for cooling off the mirrors? And should I always do it? And can someone answer this specific question so that I don’t run into more problems?
awesome demo of just how badly thermals affect telescopes. I rejected this reality when starting out, I remember thinking " oh come on, how bad can it be?? I get great views out my homes Skylight window, I don't need to go outside in the cold!" LOL how wrong I was!! After months of viewing the heavens from my Skylight, I decided to take the plunge and actually go outside with my 'scope! ( exactly where nature intended! lol ) and my goodness what a shock I got!! The views that i thought were great from inside my home, were MAGNITUDES less pleasing than what I saw while outside!! Needless to say, I've NEVER used my 'scope indoors ever since that night!! ( and I'm now 14 months into my astrophotography journey! )
Wes, Liverpool UK.
Hi Wes, good 'from experience' comment, thanks for posting. KR RJD A&NTV
@@RocketPlanet Hi again, I also meant to say, that beginning part where you're walking on a little mini world was awesome. For me personally, it just worked so well because of the nature of our hobby, i.e. us amateurs and pro's alike are highly aware of the fact we're on a huge spherical ball of rock, rocketing through space, using our telescopes to look out into the universe! Just so cool! Also loved the iROBERT thing! Cool! Thanks!
Good job!
@Astronomy and Nature TV
As for rule 3, i was thinking about starting every night with taking some standard exposures using the same lens (i`m using a normal camera + telephoto), same exposure params (not to overexpose the star), right after setting up best focus and temperature equlibrium.
Afterwards, at post-processing stage, I intended just to zoom in and count the pixels to determine the said star size.
Härligt att se något av dig igen, jag köpte jag mitt första teleskop av er i Kivik!
Excellent demos Robert . I have a 300mm aluminium ball in my front garden , I have used it to describe the crazy scale of the solar system few people really 'get it' until I've walked them down the road a bit with a tiny ball-bearing in their hand and told them 'we live here'.
At 32 degrees Latitude where I live to observe Omega Centauri globular cluster, C80 which only reaches 10 degrees from the horizon I went up to 9,200 feet elevation Bortle 2 after a rain to clear the dust from the atmosphere. I got a decent view with a calm Stratosphere, but that doesn't happen often. I live in the desert and May showers were the best time. June starts our monsoon season so it's hit or miss.
It's very funny that your first telescope was a British Army spotter scope. My first optical instrument for looking at the phenomena was a USMC issue ACOG (a 4x M7 RCO specifically)
What a great video. Liked, subscribed.
To be fair, since I moved to a new town, my greatest difficulty has not been shimmering or turbulence, but light pollution. Only a handful the very brightest stars are visible to the naked eye in the night sky which, considering this is a small, 34K inhabitants town, makes it that much more frustrating, as expectations were high for a dark sky here.
We have what we have. Maybe some road trips to darker locations would be a good idea, and even get e two-for-one: nice weekend getaways that the missis would appreciate, and som darker skies to boot.
Breakfast is frequently an experiment in our house.
I wanted a spy scope but was given a pair of Japanese binoculars by my grandfather. Next was a similar Japanese telescope (lowest to yours but the same ). I had to wait for the late 70's early 80s for that.
Understood armor, so I figured the angle right away.
My best was dead winter, and I figured out quickly to leave it outside while waiting for the highest angle.
Made a simple log...mainly for Jupiter's moons or what was observed (Saturn's rings placement).
Brilliant video for the newcomer that doesn't have the patience that we did 🍻👍
Love your vidio
What is the telescope behind you at 1:10?? For that matter what is the telescope in front of you as well??
Here's my log from the 7th Nov 2023: clouds, ooohh an hour of clear skies! Neighbours light comes on again! Other neighbours security light is on...Probably should start observing at midnight 😅 p.s light pollution seemed worse than ever...
😀 Much Thanks Robert ! Some Work huh ? Runnin' through a 2nd time on Udemy.
Completed modifications Cel. Astro~ 114, 450 FL, True Parabola, cut the Tube w/ a Pipe cutter & dremel added D. Crayford 1:10, on my FB.
20, 10, 4 Eyepieces, (4) 5x Barlows, colored glass filters, 1 good ambient light filter
@Astronomy and Nature TV
How wouild you find a balance between first law and dewing of the front element? Unfortunately, at my location even in dry summer I have to use heater after just an hour or two, as the dew ruins everything :(
Same for me too! But it’s mainly in the winter and late autumn.
Hello. Does anyone know a telescope repair service in East Anglia (West Norfolk-ish) that can install a new corrector plate into a Celestron 9.25 SCT? I have the replacement plate but my local scope shop can't help.
More on topic I like this Robert guys stuff.
Hi there, give Pulsar Observatories a ring - they are not far from you. They a an experience SCT engineer there that may be able to help you. KR RJD A&NTV
@@RocketPlanet Thank you. I'll try them.
@@RocketPlanet That Collingwood fella at Pulsar apparently doesn't touch SCT's anymore. I'm tempted to train myself in the scope repair business as it seems there would be no competition in East Anglia. Thanks anyway.
1 meter is appx 3 " more than a yard, not less than a yard
Law 4: Avoid Newtonian telescopes less than 100mm of aperture. To put into quick perspective, i have seen, a terrible view but it was there, the red spot on Jupiter in a 50mm refractor telescope. I own both a 76mm Orion Space Probe ll and a 76mm Celestron Cometron, not once have i seen any detail on any planet after owning the Space Probe for 6 years, though Saturn's rings do show up fine but no Cassini Division but i have seen the Cassini Division in a 60mm refractor telescope.
People argue about Refractor vs. Newtonian but ill tell you this one, those ell cheapo 70mm refractors full of chromatic aberration would show you much more than a Newtonian less than 114mm of aperture though with a purple tint or glow.
My honest advice would be, unless you're doing astrophotography, i wouldn't buy a refractor less than 80mm or a 130mm Newtonian unless you are like me who owns 12 telescopes and enjoys comparing, the lockdowns were useful for testing but i am a half glass full, any telescope is better than no telescope, you buy what you can afford because the important thing is that you get out there and enjoy the sky because astronomy has a lot to offer just try not to get too bogged down with all the options.
My favourite scopes are my SvBony 550 80mm apo refractor and the Skywatcher 150mm Virtuoso Newtonian telescope but we are all different, my Skywatcher Explorer 8inch doesn't get used because its huge, the the Zhumell 100mm is great for ultra portability, my Skywatcher Heritage 130p Newtonian is also a great telescope but doesn't get used after buying the 150mm and all the others are now there for comparison.
I about dropped one when saw real formulas in Python.
Oh! Alive.
Lets take a close look...
Very poor audio. Have to watch it later...