What is anti-reflection coating on watch crystals? Watch and Learn #76
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- เผยแพร่เมื่อ 12 ก.ย. 2020
- Today, a quick lesson on what anti-reflective (AR) coatings are and how they work. Hope you enjoy!
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Thank you for watching. - แนวปฏิบัติและการใช้ชีวิต
Great interview with Marc on the 4&20 podcast this week. Dude is a legend.
Thanks for listening!
No he is not. Words like Legend and Genius are just empty, hollowed out letters on TH-cam. Means very little. Marc is not a legend. That’s just a word you use to create an effect. He’s just a guy selling watches. Enthusiastic and knowledgeable sure, but not a legend. Complete inflation.
Which podcast? I'd like to hear it. 4&20 got me nothing.
@@WeibenWang Sorry- typo. 40&20. watchclicker.com/4020-the-watch-clicker-podcast/
@@Mr.Monta77 Who hurt you?
Wow. I haven't had a physics lesson in over 50 yrs. Thanks for being so transparent.
Any time!
Yes, the explanation was crystal clear.
oh my
Marc, I love theses, thanks so much for taking the time to make them! Your endearing approach makes us feel like we’ve got a friend “in the biz.” Thanks for the education!
My pleasure!
Excellent discussion of how anti reflective coatings affect lighting which pass through lenses on watches. Nice explanation in layman’s terms. Thanks for taking the time to share your knowledge on this topic....Ed
Glad it was helpful!
After a long period of time, finally a watch and learn episode. Thanks mark
Yeah, I'll get to 'em
Love these Watch & Learn sessions Marc. I've been "binge watching" them.
Great info. thanks!
Wonderful job in explaining destructive interference in such simple terms, Marc. Telling this as a physicist.
5 seconds in when you said it's time for W&L it just made my day.
Love these segments.
Great!!!
Yes I've been waiting for a new watch and learn for ages. Thank you!
More to come!
Wow , amazing, thank you for your knowledge and sharing it with us ,pretty cool .
Very informative Mark. Thank you.
I really like the educational videos. I never thought I wanted to know but I think it's cool now that I do
An excellent explanation !!! Thanks so much. Absolutely love your Watch And Learn videos ! 😃👍
Glad you like them!
Awesome stuff! Great to see another Watch and Learn!
More to come!
I've just come across your video clips and will start from The beginning. I know nothing about watches but love the look of them . I have been left some money in a will so will be looking to get a watch . So i will do my research through your videos. Thank you for posting them.
From a new UK fan
Great explanation sir! Thank you.
Fascinating lesson, I’ve missed the W&L.
Me too
Never noticed before that you are left handed. Another reason I like your channel.
Right on
He is rather sinister
Really enjoyed it. Loved getting into the physics of how it works.
Glad you enjoyed it!
Missed these. Thanks for all of them.
No problem!
mind blown, thanks Marc
Very educational -- thanks, Marc.
I love these Watch and Learn videos. I think you are the best youtuber about watches when you talk about technical topics. Congrats.
Thank you
I love this series, and I cannot wait to get my mother-of-pearl islander! I have not ordered since before COVID.
Another informative post, Marc. Thanks
Glad you enjoyed it
ive missed this series!
I'm a physics student and this vid is more usefull then my optics lesson
See, your engineering education did not go to waste!
Thank you Marc!
Thanks, Mark. Very helpful.
Very welcome
Another cool video. Thanks for the info!
Thanks for watching!
Another excellent W&L 👍
Many thanks!
I did my thesis on optics because of my color blindness and your explanation on A.R. coatings is epic can’t thank you enough! It brought back lots of memories of my research which included electromagnetic wavelengths visible light spectrum and glass refraction angles!
Wow! Sounds like a good one!
Long Island Watch btw, every time I watch your videos because of the name of your channel I think of my aunt who lives in Hempstead! Sorry Mark, just a random thought, anyway keep up the awesome work... I enjoy your channel
Very interesting! Thanks Marc! 😃
My pleasure!
So educational, thanks !!
Glad it was helpful!
Yay, another Watch and Learn episode! Miss those, but on the other hand it feels like you have covered most of the most important stuff about how watches work already lol.
That is a valid point!
Thank you, I've not been able to find a simple ( layman's) explanation for how it works, like this,,
Much appreciated,,, !!..
Glad it worked out for you.
Great video Marc!!! Had no idea it was about destructive interference, always thought it was absorbance vs reflectivity. Fascinating, but not enough for me to miss my college calculus classes, LOL! Still, I'm nerding-out.. Loved it!
You got it!
Thanks mate, appreciated that 👍🏻👍🏻
No problem 👍
Thanks, Marc! Never new you were left handed. Sinister!
Now you know!
Hey Marc!
Have you ever made a WaL overview of different strap materials? For both style and function. Maybe also clasp and buckle types.
Great explanation
Glad you liked it
I just received my Phoibos leviathan Bronze with a very beautiful sapphire crystal. I have never seen one like this. I have no idea if it has any coating but its amazing. Thanks for the quick shipping. I am now looking at a Aviation watch from you, and it has to be a Long Island watch
Wonderful!
Very nice presentation and explanation Mark. You could have been an engineer.
Interesting...thanks!
You bet!
Thanks Marc. That's a fantastic and easy to understand explanation of AR. Personally, my biggest gripe about a watch is reflections off the crystal. This is why I'll never understand why people like domed crystals. Perhaps you can do a watch and learn on what's good about a domed crystal, because I certainly don't get it. The favourite watch in my collection is a Certina that has AR on top and bottom of the crystal. It's wonderful.
In many situations, dome is fine. I suspect and my own personal belief is that dome just looks better, so we put up with the increased reflections.
Excellent, I can look clever to my wife now and she's a Dispensing Optician :-) You're left handed like all the best people in the world ;-) I'd love to see a watch similar to the Islander-09, but with coloured hands similar to the Squale.
😀
Great video Marc. I find AR a bit overhyped. I’ve used both and have decided I prefer the sapphires without AR simply because everything on the dial looks crisper to me.
That is a very valid point.
Thank you.
You're welcome!
A wonderful explanation.. one question, how can I tell if I have an AR on the top pf the sapphire crystal?
Se nota que eres ingeniero, gracias por la explicación 👍
De nada!
hey marc, nice pun haha. you've got to use it as your tag line one of these days. love your new fliegers though. thinking of getting one on my bday in november. more power!
Thanks 👍
Very nice double Squale 👌 🕒🕒
Thank you! Cheers!
Great video. I love the AR treatment Omega and Breitling does. Why doesn't Rolex use AR coating? (on the cyclops they do use however).
clarity.
I have a Sinn 104, coating on both sides, and when I first looked at it it blew my mind. Clearest thing I’ve ever seen, and clearer from more angles. It completely reset my expectations. I suspect Demasko is similar?
Yes, absolutely.
Yay a leftie 👍🏻. I was one of the few left handers at school, until I studied engineering at university. Where the number left handed people was were near 50/50 split. This was the same following engineering related career.
This is very true!
I missed these..
Glad to be back!
Hi mark, your videos are very informative. Thank you. I have 350$ MVMT Divers watch with sapphire crystal without AR Coating. Is there any DIY coating like ceramic/graphene coating to make it AR glass?
I always appreciate the time and effort you put into these informative videos Marc. When you used the noise-cancelling headphones analogy, that really made me understand. My Sinn 856 must have awesome AR. At most angles you can't tell there's a crystal there.
Yes it does.
Thanks. My O level physics has come back to me.
:)
It depends on the dial colour and the crystal they are using. As i remember, the index of refraction of sapphire is nd=2,54 and it is very high compared to eye glasses or other optic devices like telescopes, binoculars etc. It is used because its very high toughness. Also the AR coating could be single layer or multi layer, depending of what transmission you want to achieve. Usually the simple requirement is - for spectral band 500-600nm, the reflection to be less than 1%, this is easy achieved by a single layer AR. But for more precise and maybe luxurious and expensive brands, they may use a specification as for spectral band 380-800nm - covering the full visible spectre, reflection must be less than 0,25% - and that is very hard to achieve thats why is very expensive.
That was a good explanation and the illustrations helped immensely. How much is transmittance reduced by conventional ar coatings?
not much; a few %
Dear Marc
Yet another great video.
Oil filled watches have little or no glare I will need to watch your video again to figure out why.
On another note and an idea for next episode. When a watch is being wound, be it automatically or by hand how can the spring be tightened while releasing energy at the same time to create the ticking motion.
Thank you! Oil filled has to do with the oil taking up all the air and reducing scatter (that's my guess).
@@islandwatch Thanks I think you maybe right I believe the refractive index of oil is closer to glass than to air.
While on the subject of optics.
Q. How hard do Opticians work?
A. The work at a Snell's pace ;)
(Snell's law)
If you had a whiteboard I might have mistaken you for Engineering Explained 😂😂 nice vid though, I’d deff watch more like this
Thank you.
Brilliant vid. How does it work when AR coating is only applied to the inside of the crystal 🤔?
works half as well, just like you would think. It only eliminates errant rays off the inside surface.
Hello Mark, great video! I have a question that is off topic from this video. I recently acquired a 1962 Omega Seamaster manual wind chronograph with the 321 movement. The hairspring to the main wheel needs to be replaced, top button pusher to the chronograph is missing, the back case casket is missing, also in need of a thorough cleaning. I got it next to nothing at a garage sale. Should I take it to my local watch repair shop that I take all my watches to or, mail it off to Omega to have the work done? I hear that the Omega choice is a bad idea, for the fact that they will buff the case and take the patina off the dial.
Get a good local watchmaker to help you out!
Great explanation! I’ve heard of AR coatings on the outside getting damaged and having to be removed for aesthetics. Do you see much of that. 👍🏻👍🏻🇺🇸
Not really. Brands that put it on the outside have really perfected the process, and it's pretty tough to scratch. But honestly, its nothing that polish won't take off.
Long Island Watch 👍🏻
I’m buying a snxs57 black dial, do you recommend a clear sapphire or a blue one,help?
What about the Yacht Islander?
Hi Marc from Poland :)
I have recently bought flat SKX saphire from you withour AR, but frankly I’d love to get one with. Are you planning on making flats with AR?
Probably in the future.
Marc? If you autographed and framed those drawings they would fetch a pretty penny. They are very Da Vinci like. They would look awesome hanging on a wall. Give that some thought.
Great idea
So I'm looking down at my wrists. I'm double-wristing like Marc. On my left wrist I have an Oris Aquis and on my right I have an Islander ISL-21. There is a bright light from the ceiling fan above me and the Islander has AR that is like 5 times better than the Oris. I personally do not like AR but I get it and I'm blown away how much better a $300 Islander's AR is than a $2000 Oris.
Wow! Great to hear that!!!!!
Marc is a southpaw!
Yup
If this were another channel we would see loads of marketing fluff, not with Mark though, it's a lesson in optics we shall get!
Hope you liked it!
Hey Marc, any chance you’ll be carrying the new 38mm alpinists?
nope
So in other words, it is magic :)
Black magic!
The reduction in lucidity is much more pronounced in telescope lenses. The more lenses with anti-glare, the more useless the telescope becomes for less bright objects.
I'm looking to buy one of your watches. I'm a big Seiko SKX fan, what would be the best daily beater that looks great on a NATO strap from your selection? I'm going to buy one tonight.
Islander :)
@@islandwatch It's ordered! 👍👍
@@islandwatch Islander 38mm Pepsi jubilee bracelet. 👍 Can't wait to see it Wednesday.
How much demand is there for AR coating on crystals, or do most clients really not care?
And so concludes this lecture with Marc Einstein. Love your “how to and why”videos.
Watch and Learn :)
An alternative to AR is a crystal that blurs reflections, making them less irritating. Rolex does this, I hear.
sounds interesting
As a retired optometrist I found your statement that AR coated lenses reduce the amount of transmitted light to be opposite of what oppthamic lens manufacturers have always claimed. They always say that uncoated (no AR) lenses transmit about 92% of the visible spectrum on average to the eyeglass wearer, whereas AR coated lenses transmit 97-99%. In multi-element optics like a camera the need for AR coatings to increase transmission is even more essential. Backside AE does reduce reflections that can annoy an eyeglass wearer but that is not the primary reason for having AR coated eyeglass lenses. You should see a brighter image of a watch dial through an AR coated sapphire crystal when compared to an uncoated sapphire crystal. The Seiko crystal is plastic which might be why you judged the uncoated dial to be easier to see.
The Seiko crystal is mineral glass. I think what you're referring to, with increased transmission, as with telescopes, is direct 90 degree incident radiation? The problem with AR is it affects ALL incoming light, not just perpendicular.
I yield to smarter optical people than me.
Hi Marc, Solving Fresnel equations for reflectivity in the 90 degree case yields 4.2% reflectivity for tempered glass( N=1.52) and 7.7% reflectivity for uncoated sapphire (N=1.77). This may explain the duller appearance subjectively for uncoated sapphire. When both side AR coated a sapphire crystal should be less reflective as your Damasko example demonstrates.
Question... Can you actually see the difference if I show you 2 watches? One with and one without, will you see the difference?
Why does that SKX have a Seiko 5 tag on it?
That's the way J models are.
For the longest time I've wanted to understand if the Orient Sun and Moon gen1 has an AR coating on its sapphire. The crystal seems a bit hazy compared to other watches, but I haven't been able to find any information confirming that. Thanks a lot for the explanation!
It doesn't, though it might be foggy due to not being fully cleaned on the inside.
@@islandwatch Thank you for replying. Have a great week.
Yeah, I guess this is why my Vantablack coated, anti-reflective watch crystals haven't sold very well. :-/
LOL!
God i love Damasko watches
timepieces of distinction!
What? That's a lot more complicated than I thought. How precise of the application of AR coating do you need? Does it also mean that, a company may claim that they have AR coating, but does not apply them properly?
The thickness application must be controlled very well, but this is easier than it sounds.
For a minute there, I thought I was back at school sitting in my science class.
Hopefully you paid attention, then and now :)
Long Island Watch haha well put it this way, I feel more educated listening to you talk about something I’m interested in. Keep up the good work.
So when’s the Kamasu sapphire insert coming? 😂
Maybe a month or so.
What type of engineer were you?
You mean "are you". It never stops. BE and ME in Mechanical Engineering, worked in Aerospace for 13 years.
No pun intended? Who are you kidding? ;)
Of course!!!
Today I learned Marc is left handed
LOL
Left handed!
So. Now it's about time to shave dude.
every few days. . .
Still don't get it 🥴
Sorry!
AR coating is too easy to be scratched
first view and comment :) well done mark - I messages you on Instagram but never got a response ( @rksti.me)
First like on the first comment
check out my instagram 'about', it says do not DM. We don't check it. If you need help, simply email.
@@islandwatch ok thank you
Very “clear” explanation. (Sorry)
LOL. I see what you did!
You talk like my mother the particle physicist, eg. she doesn't understand millions and billions. She has to translate to 10^6 and 10^9.
;)