Diffraction Spikes in Astronomy

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It's time to address the elephant in the observatory once and for all.
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29 июн 2024

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Комментарии : 276

@CuivTheLazyGeek 10 месяцев назад

Dylan, this may be your best video ever, and maybe my favorite astro-related video of all time :) It has it all, an awesome intro, a Wilhelm scream with gorgeous blood patterns (but no blood spikes!), a super interesting topic that actually made me take my phone out for your experiments, and a delightful kick at those repetitive and (to me) somewhat annoying shorts and tiktoks.... In other words, perfection!

@DylanODonnell 10 месяцев назад

Ahh Cuiv thanks for seeing all the hidden elements you legend!

@raeiqmusachi 10 месяцев назад

very entertaining indeed, i was thinking here we going again dylan’s gonna be a d***, but mate it was a 9.5 minute ride of emotions 1st 1/4 hmm dylan being a d…. 2nd 1/4 f*** maybe his right 3rd 1/4 yeah stuff spikes they suck screw eyelashes they suck too lastly the picture of the star : me thinking oh but it looks kinda cool your reactions were 👌 was chuckling throughout (PS. its ok to be a d…) or at least pretend , i’m sure you’re a big softy

@DylanODonnell 10 месяцев назад

@@raeiqmusachi haha thanks for sharing your side of the journey ! 👏🏼

@Microtonal_Cats 10 месяцев назад

I spit soda on my screen laughing at the Wilhelm scream scene.

@ArthurIAHamm 8 месяцев назад

@@DylanODonnellhe's right you should do more of this, amazing!

10 месяцев назад

There is no better way to understand something with laughter. Thank you Dylan.

@DylanODonnell 10 месяцев назад

Thx legend :)

@VikingTeddy 10 месяцев назад

Dylan calmly explaining in the beginning why we should have intercourse is all I need to enjoy a video.

@videotrexx 10 месяцев назад

What's lame is people that ADD diffraction spikes to images that don't have them to begin with. But the refractor breaking and killing someone? That was hilarious!

@DylanODonnell 10 месяцев назад

hehe yeh software diffraction spikes is next level cringe

@cemoguz2786 10 месяцев назад

@cathalbyrne844 10 месяцев назад

Yep! They look awful every time.

@siberx4 10 месяцев назад

I have no problem with diffraction spikes, but I'm also not bothered by their absence; it's a neat quirky detail that gives you a bit of insight into the telescope that shot an image, but in my opinion does not otherwise enhance or worsen the image. Now, the fact that my spike-generating reflector cost a third as much as an equivalent apochromatic refractor well, _that_ is something I do care about. Cool demonstration with the wire and laser though!

@cryhavoc38 4 месяца назад

for us that grew up before the interwebs, much love to the diffraction spikes! That is what we saw in every image of stars back in the day. Here's to adding two thin strings to refractors to simulate those lovely spikes.

@astroimagers 10 месяцев назад

"I pointed my telescope at the sky for 20 seconds and this is what I saw" 💀😂 Brilliant burn! +Music😅

@DylanODonnell 10 месяцев назад

Hehe

@TheNarrowbandChannel 10 месяцев назад

The swiping your finger across the cell phone camera lens to make a spike is cool. Now I know how to scold my crews that set up booths and take epicures with a dirty cell phone lens.

@jasonpatterson8091 10 месяцев назад

What's extra funny is that if the spikes aren't perfect, then it really, really looks bad. A reflector with a focuser tube that extends into the light path or mirror clips that cover a bit of the edge of the mirror make ugly, asymmetric fuzzy spikes, and if the opposite legs of a 4 legged spider aren't lined up right, you get 6 or 8 spikes that are janky and only slightly misaligned and just hurt the eye.

@DylanODonnell 10 месяцев назад

true!

@timmyfingaz100 10 месяцев назад

bet your fun at partys

@RalphBidner 10 месяцев назад

If you use a CNC forged spider all ugly Spikes are gone and you get pinpoint sharp spikes. You can also use these sharp spikes for focusing.

@MGralike 10 месяцев назад

LOL - that's why I didn't buy a RASA yet or hyperstar. Incredible difficult to get rid of those nasty spikes. Then again. Who cares. Its f/2. :)

@cribbsprojects 10 месяцев назад

Instant subscription - without even checking out your back catalog - caused by your ruthless nerdiness... Nice video!

@DylanODonnell 10 месяцев назад

Welcome to the party :)

@MarcusHouse 9 месяцев назад

Super loved this video Dylan. Thanks mate!

@southeasttexassky3297 10 месяцев назад

Now I gotta go spike my Esprit 120ED refractor! Love how you can turn a topic like this into entertainment. Keep it up! Love your channel and get excited when it shows a new post. What’s next? Dust motes are art? 😂

@DylanODonnell 10 месяцев назад

Haha appreciate the view, thanks mate!

@theinterstellarfeller 9 месяцев назад

Another great video Dylan! Love your take on this and your image of Fomalhaut is awesome!

@ziggyfrnds 10 месяцев назад

Always a good day when you upload a video Dylan! Thanks for the info and the laughs mate! And as a newtonian telescope owner nya nya nya :D But seriously the first time I looked at JWST images I went "WTF are those!!" But that thing does do amazing science so we'll pretend it's cool. Do you think the designers knew the spikes were going to be huge and 6 in number and went nahh everyone will think it's cool :P

@DylanODonnell 10 месяцев назад

Thx Zigs! Oh they definitely knew .. it’s a fair trade though for that light gathering power!

@Calzune 10 месяцев назад

Interesting video! And I love that you made fun of the "I pointed my telescope at the sky" , its so cringe that almost everyone uses that sentence.. big thumbs up!

@scottgriz 10 месяцев назад

Dylan, I thought I was the only one who was a big enough geek to ask my eye doctor for the image of the inside of my retina.

@DylanODonnell 10 месяцев назад

Heh I should let him know. I always ask for digital copies of all medical imaging !

@8gonzalo411 10 месяцев назад

Very good meaningless content as always. Greetings from Argentina

@DylanODonnell 10 месяцев назад

Glad I've made things a little more meaningless for you :)

@8gonzalo411 10 месяцев назад

😂🤗@@DylanODonnell

@Kata_Mae 10 месяцев назад

A precision comment for the ones who fell for it like me : The diffraction spikes are not the big spikes on the sides, these are reflections of the laser on the surface of a cylinder. The diffraction spikes are the far smaller ones inside the shadow of the cylinder, they make the shadow narrower.

@earth9258 9 месяцев назад

Quality content per typical. I appreciate you keeping us astronerds supplied with stuff to watch. I have a 8” RC. I don’t have strong feelings about the spikes. They’re a defect, but they look cool. In a perfect world they wouldn’t exist. What I appreciate about them is they give character to bright stars. Rather than brighter stars simply being more bloated they acquire longer spikes. I feel they portray the magnitude well as a sense of brightness can get lost in post processing. Plus it sets my RC images apart from my redcat 51. (Which stupidly also abbreviates to RC)

@whoe_whate8487 10 месяцев назад

Diffraction spikes have always looked pretty cool to me, but if you really want a realistic image than wanting to avoid them is totally reasonable. Love your vids man.

@DylanODonnell 10 месяцев назад

Thanks !

@marinaamgad5781 10 месяцев назад

This video made me not sure whether to love or hate diffraction spikes...

@TheWonkyAstronomer 10 месяцев назад

Some people make their struts curved to 'remove' the diffraction spikes. But all they're doing it spreading out the diffracted light across the whole image - reducing the contrast.

@andrewweller5119 9 месяцев назад

Aw, we love your content and voice Dylan.

@bngwira 10 месяцев назад

Great video Dylan 👏👏👏

@christlesterlin8787 9 месяцев назад

Dylan, please keep doing what you are doing the way you are doing it!

@xs4allan 10 месяцев назад

I pointed my retina at your yotube video for 560 seconds and your youtube video is what I saw

@DylanODonnell 10 месяцев назад

Holy shit let’s go !

@Roymac01 10 месяцев назад

You had me with the Wilhelm Scream!

@lukomatico 10 месяцев назад

Loved this one mate, cracking! :-D

@Wilfredos_Astrophotography 10 месяцев назад

I would agree, this is an awesome video and one of your best. Thank you for sharing.

@DylanODonnell 10 месяцев назад

Cheers Wilfred !

@loransd6014 10 месяцев назад

Excellent video!

@ChrisHoward 10 месяцев назад

Brilliant, as always.

@trev354 10 месяцев назад

Hey D, Good job, Laughs and info as you do. Well done.

@DylanODonnell 10 месяцев назад

Thanks Trev!

@RFtinkerer 10 месяцев назад

I'm not showing this video to my Newtonian as I typically do with your videos, but this was your most entertaining video so far. Spikes are great on the Pleiades IMO, but holy cow do they suck around Alnitak.

@Astrobloke 10 месяцев назад

Your best image yet, unlucky dude LMAO! and you forgot to mention my fav scope, a Newtonian! Its definitely a debate I have seen raged on and I loved the fact our own eyes do this to bright lights. Great work mate and clear skies to you.

@DylanODonnell 10 месяцев назад

Thanks Bloke !

@AA-vs9kh 10 месяцев назад

Usually your intro soundtrack does my neurodivergent head in….but just like you were forced to admit the spike truth…I have to say this is a damn great video, man. Well done 👍🏼

@DylanODonnell 10 месяцев назад

Haha thanks !

@BARACUDA4000 9 месяцев назад

You deserve at least a million subscribers.

@my-pixels 10 месяцев назад

I like your approach to creating videos with a pinch of humor. This one however is one of my favs. Such an unexpected ending haha 🤣🤣😂😂

@DylanODonnell 10 месяцев назад

Haha thanks so much !

@vicamaral 10 месяцев назад

Your sir are amazing and funny, i found this video highly compelling, clear spikes.

@DylanODonnell 10 месяцев назад

Thankyou sir !

@synner00 10 месяцев назад

Great video. Love the Wilhelm scream :D

@DylanODonnell 10 месяцев назад

Hehe thx man

@tobuslieven 10 месяцев назад

Check out the Pfund telescope. They use a large 45 degree flat mirror to direct light into the primary. You observe through a hole in the flat, at the focus of the primary. No secondary supports means no diffraction spikes.

@noddyonice 10 месяцев назад

“….for 20 seconds, this is what I saw.” Perfect piss take! 🤣 Keep up the good work. 👍🏻 Noddy

@DylanODonnell 10 месяцев назад

Hehe cheers Nod!

@RaysAstrophotography 10 месяцев назад

Dylan, very well done!

@DylanODonnell 10 месяцев назад

Thanks Ray!

@TheAntibozo 10 месяцев назад

Really fun vid. Enjoyed it immensely! 🐿🐿🐿

@DylanODonnell 10 месяцев назад

Thx 🐿️

@joshmccollumastrophotography 10 месяцев назад

My schools observatory uses a Meade LXD75, which has the 3 struts! I was really confused when we couldn't see the JWST spikes when I tested it a little while back. Now I know! Thanks!

@DeanLouviere 10 месяцев назад

@gabrieldavidson4442 10 месяцев назад

My newtonian: Why is the man in the white coat saying my spikes are stupid? Me: Don't listen to him, he's only jealous that you're special.

@DylanODonnell 10 месяцев назад

Heheh

@richiebricker 10 месяцев назад

Diffraction spikes are real to all old people. From stars to oncoming car lights to bright spots on my computer screen. There are spikes everywhere. The older ya get the spikier everything is and eventually fades to a fuzziness of fuzz. everybody looks furry. I cant tell if I shaved by looking in a mirror. Someday it will all be black just like the universe

@AstroSoundscape 10 месяцев назад

I just really liked the refractor killing the guy😂. Great science stuff too Dylan.

@klaussfreire 10 месяцев назад

If you want to explain it, which I know you don't but I will anyway just because, I think they're pretty because they add extra information about just how bright a star in the image is that you wouldn't get quite so clearly without them.

@Suprastar87 10 месяцев назад

The last image is beautiful and shows diffraction have their place in some images

@brendanmanning1959 10 месяцев назад

Thank you

@keithhanssen7413 10 месяцев назад

That was oddly informative and strangely humorous while simultaneously being very well done.

@DylanODonnell 10 месяцев назад

Thanks Keith!

@mauriciomorenorivera 10 месяцев назад

can't stop watching this stuff...

@bradleypout1820 10 месяцев назад

loved the video~~~!!

@DylanODonnell 10 месяцев назад

Cheers Bradley !

@gromi008 10 месяцев назад

When you don't have tracking mount: "I POINTED MY TELESCOPE AT THE SKY FOR 1 SECOND AND THIS IS WHAT I SAW"

@DylanODonnell 10 месяцев назад

Hahaha I like it

@deep_space_dave 10 месяцев назад

Dylan this was the best explanation of diffraction spikes I have ever seen! For a moment I thought I was watching one of those PBS channels LOL Well done mate! I don't like those diffraction spikes either and I don't understand why people modify a perfectly good telescope to create them 🤷‍♂? Thanks for the video and clear skies!

@DylanODonnell 10 месяцев назад

High praise ! Thanks !

@deep_space_dave 10 месяцев назад

@@DylanODonnell I forgot to mention that I am really looking forward to the images of the Giant Magellan Telescope which will be the biggest telescope on earth and NO DIFFRACTION SPIKES! 😁

@xero2715 10 месяцев назад

I think starlink is still an issue. While diffraction spikes are annoying, they are ultimately unavoidable with the optics present. Satellite trails, on the other hand are avoidable. They also (at leas to my eyes) appear to at some points take up a larger area of the image than the diffraction spikes present.

@nikaxstrophotography 10 месяцев назад

Yep definitely not a spikes fan, great video mate

@MrGp3po 9 месяцев назад

Wonderful video explaining how something works that everybody knew already. Or did they? ;)

@theheavensdeclareastro 10 месяцев назад

SCT Gang 😤😤 As always, loved the delivery and video!

@DylanODonnell 10 месяцев назад

thanks man!

@Mandragara 10 месяцев назад

Maksutov Newtonian gang. Sct f ratios are cringe

@DylanODonnell 10 месяцев назад

@@Mandragara 🔪

@theheavensdeclareastro 10 месяцев назад

@@Mandragara but that focal length tho 👀

@Mandragara 10 месяцев назад

@@theheavensdeclareastro Dat atmospheric blur limiting exposure time, forced use of lucky imaging and subsequent SNR impact :)

@seanliberty1626 10 месяцев назад

Informative and funny.

@jamesmcvicar8414 10 месяцев назад

Loved this! And it made me laugh! :-)

@DylanODonnell 10 месяцев назад

Thanks James !

@VisibledarkAstro 10 месяцев назад

😂 " your opinion is dumb and wrong"... no sugar coating it eh. Straight up stab. I think I'll use that line for starting out future conversations! 😮😂

@DylanODonnell 10 месяцев назад

Hah. Fair and balanced.

@skygazerII 10 месяцев назад

Another great video! Sadly, I couldn't see anything after 5:20 because my eyes were dazzled by my cellphone light.

@DylanODonnell 10 месяцев назад

Lol

@corydavis4121 10 месяцев назад

I love that you made fun of the "I pointed my telescope at..." statement. It just screams cringe every time I see a post titled in this manner.

@mgmcd1 10 месяцев назад

Visual Astronomers (to paraphrase The Treasure of the Sierra Madres): “Diffraction spikes! We don’t need no stinking diffraction spikes!” To paraphrase Ozzy Man: Wonderful viddy you great big beautiful bastard.

@DylanODonnell 10 месяцев назад

Cheers mate !

@davewilton6021 10 месяцев назад

Great video! One minor correction, though from a native New Jerseyan: High Point Scientific is based in New Jersey, not New York (and based in a particularly beautiful part of the state, nestled in the Appalachian Mountains. It may seem like a minor point, but there's a long history of New York taking credit for the good things that come from New Jersey. "Trenton Makes; the World Takes."

@Microtonal_Cats 10 месяцев назад

I noticed that too, but give him a break. Dylan's all the way down there in Wellington Bay, New Zealand. New Jersey is upside down from there, just like the Moon.

@robinbennett3531 10 месяцев назад

@@Microtonal_Cats HaHa!

@DylanODonnell 10 месяцев назад

I mean it’s in the ballpark isn’t it? 😂

@darkrangersinc 10 месяцев назад

I had somebody that I am mentoring through the hobby ask me how he could artificially add diffraction spikes to his Apo. My response was about the same as your first 30 seconds. Very educational I saw a video early on that the six point diffraction spike was from the James Webb too. Nice to know that’s not true!

@DylanODonnell 10 месяцев назад

Haha oh man software spikes. Instagram filter post processing.

@koomber777 10 месяцев назад

I use vintage telephoto lenses for imaging and the diffraction spikes from the iris ifbyou stop them down is oretty wild. Tend to use step down rings instead. Still, nothing like imaging nebula with a £20 takumar lens from the 70's* I just dont mention the £800 camera that took the actual picture.

@lelloimmensobet 10 месяцев назад

I was thinking about buying a Newton but you changed my mind! 😂😂😂

@DylanODonnell 10 месяцев назад

Then it was all worth it.

@savtheastroguy 9 месяцев назад

Diffraction Spikes roll!!!

@brandonrunyon 10 месяцев назад

I admit that this is where, as a visual astronomer i think you're right. Stars through my 16" dob arent nearly as pleasing as through my esprit 100 (thats right, i do visual with an apo triplet...). Perfect orbs of happiness are more scientifically accurate.

@Microtonal_Cats 10 месяцев назад

Diffraction Spikes make space look like a Christmas card.

@markmeridian3360 10 месяцев назад

There is an advantage to the Hubble and the JWST's diffraction spikes. They only appear on point objects which are almost always stars. So you can easily tell foreground stars from galaxies in the background with the same magnitude.

@frankenstein77777 10 месяцев назад

Excellent video Dylan, although I just blinded myself looking at the sun to observe its diffraction spikes.

@Martinko_Pcik 10 месяцев назад

Google reads my mind. I was just looking at the spider of my newtonian wondering 🤔 if I could remove spikes somehow. Looked at the RU-vid without searching and noticed this video. Spooky 😂

@DylanODonnell 10 месяцев назад

Google knows !

@tfer68 10 месяцев назад

I’ve actually thought about adding a thin braided cable (taped at 90° and 180° - crosshairs) on my CPC1100 to add the spikes!

@DylanODonnell 10 месяцев назад

It's fun!

@caroliensche13 10 месяцев назад

The problem is, whatever you do, you will always have diffraction. In a Cassegrain or a classic lens, you will have diffraction at the outer edge od the aperture. This does not produce spikes but distributes the artifacts into all directions, forming Airy discs. And there is nothing you can do about it. Even when using a graded aperture, diffraction would still occur and reduce contrast. In my opinion, the best you can do is to minimize the total length of diffracting edges (and that's not what they're doing at the Giant Magellan Telescope).

@viewintospace 10 месяцев назад

When will you start your Standup Comedy tour? OK, I would not come to the other side of the world for that, but if you ever tour Europe, I might buy a ticket 😉

@DylanODonnell 10 месяцев назад

I dunno man.. sounds like a lotta work. ☺️

@gliderrider 5 месяцев назад

Now I get it. I went through the same thing. Except on a smaller scale. My scope is a zwo Seestar s50. My old 10” dob had spikes. lol So the tiny scope is not cheating me. It’s actually telling me the truth!

@batchosaurus 10 месяцев назад

I didn't know that................thanks mate

@NG-VQ37VHR 10 месяцев назад

I liked them when i started also. My first scope was a 10" dob. I quickly learned visual wasnt my thing and got an 80mm apo and an heq5 pro. Once i figure out why i only got the spikes in my dob, i modeled and printed a cap with fake struts that i could use when i wanted them. Once the quality of my images improved, i liked the spikes much less and stopped using it. That goofy cap i made got a bunch of downloads on thingiverse though. So, there must've been lot of people that went through the same phase.

@DylanODonnell 10 месяцев назад

Similar arc!

@davidwillis5396 10 месяцев назад

Exelent keep it up

@seanchristie9146 9 месяцев назад

awesome

@Microtonal_Cats 10 месяцев назад

It's astonishing to me how many people give much more love to space pix with diffraction spikes, including people who should know better (various APODs and IOTDs judged by other astrophotographers for instance.) NASA probably loves them because they probably lead to more funding. You can get screw-on filters for DSLRs (and SLRs) that add a star pattern to any point of light, like candles. They've existed for at least 50 years and are cheezy as fug. Used to be used in graduation photos, wedding photos, boudoir photography...Diffraction spikes remind me of that.

@DylanODonnell 10 месяцев назад

Agree! Total cringe

@Microtonal_Cats 10 месяцев назад

@@DylanODonnell Anthony Quintile won AB IOTD for M45 on Christmas last year. SO many spikes!

@DylanODonnell 10 месяцев назад

@@Microtonal_Cats proves your point really :)

@Microtonal_Cats 10 месяцев назад

@@DylanODonnell He made the connection a few minutes ago. I didn't notice, though maybe subconsciously inspired my meme. I do remember seeing it but saw it after Xmas and didn't consciously realize it was IOTD on Xmas.

@russellmm 10 месяцев назад

You timing on this topic is very interesting. I was just looking at the newest JWST images over the weekend and the Herbig-Haro image is rather humerous. the text says "Look for them at the center of the red diffraction spikes"... and to my eyes it was "If those large a** spikes were not in the way you could see stars forming"

@russellmm 10 месяцев назад

Oh and also... my bahtinov mask used to create all kinds of spikes if I forgot to take it off :)

@DylanODonnell 10 месяцев назад

Lol exactly man

@frankbraker Месяц назад

How to physically remove diffraction spikes by 3D-printing wierdly shaped spider support beams (or whatever those are called): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ILd34isTl14.htmlsi=PwA7klGGAn7rNz2A

@iandobbin8068 10 месяцев назад

Looks like I'm going to have to get a gold ball for the Xmas tree this year and get the kids to squint.

@avt_astro206 10 месяцев назад

I use to be a fan of Diffraction spikes myself! But A lot of Times those Spikes aren't even perfect in the image plane! Nice video man! 4:53 looks like Ginger Breadman Spikes to me 😂

@Mockingbird57 10 месяцев назад

step 1...spike punch... step 2...spike telescope... step 3...enjoy the rest of your evening 🙂

@user-lt9py2pu6u 10 месяцев назад

Non astronomers seem to love diffraction spikes on images, I think thats why the worlds large observatories leave them on the image's released for viewing by the general puplic. Personally I find the odd image looks great with them but on every image? Nah, boring. Great video.

@johnmcbryde715 10 месяцев назад

that was spiketacular

@Stefan-Astro-Art 10 месяцев назад

I got a very thin transparent nylon wired of 2mm on the front of my refractor. And that makes my spikes very thin and small, no to big like JWST. I know its not real but it give some extras to my image, so long they are not too big. Nice video by te way

@DylanODonnell 10 месяцев назад

Thanks Stefan

@DeepSpaceAstro 10 месяцев назад

I always wondered why stars were drawn like that!

@mhamen2 10 месяцев назад

I do love the clean stars that a nice APO can produce but if you want fast optics with some reach then spikes are a fact of life. I sold all my refractors and now I'm a fast newt simp.

@GlennMartinPhotography 10 месяцев назад

And lo, the people across the internet that did stare into the bright light of their phone, and exclaim hark! there be the spikes. And then there was much blindness.

@richardshagam8608 9 месяцев назад

I like spikes on the images from the telescope that makes spikes (my 8" RC) and I don't like spikes from the telescope that doesn't make spikes (my refractor and my Schmidt-Newton). However, I abhore the spikes that come off of a photographic lens I use when it is stopped down--adjustable camera lens irises make terrible spikes.

@Butzemann123 8 месяцев назад

Ah yes, the generic "i PoInTeD mY tELesCOpE aT tHe sKY aNd tHiS iS wHaT i sAw" Gotta love the moment when lil billy takes a first glance through his walmart and actually only sees black and a few dots.

@cemoguz2786 10 месяцев назад

I like spikes when they come with telescope and sharp.

@sinsolosin 10 месяцев назад

Hate spikes, but they can be there because. End of the story, whatever. Dylan, you're awesome, gotta drop you a visit next time we're on the Pacific HWY south :P

@NomenNominandum 4 месяца назад

Diffraction spikes suck when you are doing astrophotography with an alt/az mounted telescope (e.g. a Dobsonian) because they get rotated due to field rotation.

@DylanODonnell 4 месяца назад

see latest video for dob retort :)

@kevinashley478 9 месяцев назад

Hey Dylan. Love your videos, and i believe a while back, we said we would play a chess match, lol. I have a relatively quick question. So, there is a star that I want to capture. Its not overly impressive, but it is the second to last star in the tail of Draco. How can i image that star, make it really stand out and not have the rest of the stars overpower it?