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Why put anti reflective (AR) coatings on watches?!
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- Опубліковано 14 кві 2020
- Wherein Dr. Know-it-all reflects on the value of anti-reflective, or AR, coatings on watch crystals. What are the origins of AR coatings? How do they work? Why are they useful? And why might you not want AR coatings on your watch crystal? All of this and more is covered in this video.
Please be sure to hit the “thumbs-up” button if you like this video, and subscribe to the channel for more. Also please ask questions in the comments, or at: DrKnowItAllKnows@gmail.com. Thank you!
Also generally flat crystals don't get hit as much. That's why a lot of plastic crystals are dome, because when you hit the watch you hit the Crystal instead and then when it gets damaged you just replace it for extremely cheaply. Whenever I do a change out from Sapphire to plastic, I always get an extra one, it really protects the watch and then if it gets too damaged to repair you can just put the new one on again and have a brand new watch again.
Great video and presentation. You answered the questions I was looking for answers to
Thank you for making this video! I've taught Optics for several years, and definitely feel that with the high index of refraction, sapphire needs these AR coatings. Otherwise if you use a softer crystal like the Acrylic on the Sinn 103 then with the lower index, reflections are not a problem. Typically an AR coating is optimized for the peak brightness of the sun in the green/yellow portion of the spectrum. That means that blue and red will partially reflect, hence the blue/purple reflectins you see. Ideally a flat sapphire crystal with AR on both sides will give you the best results. The Glycine Base 22 is a great example of doing this right.
Some Rolex have AR. Depends on the year and model. The cyclops sections have been getting AR coating for decades. More recently, some models started getting AR coating on the inside of the full crystal. And more recently, some models started getting AR coating on both sides.
Some models have AR on both sides? You mean one model
Very instructive presentation ; a bit lacking of comparisons, but exposing pros and cons quite thoroughly. =)
Another con I came to find out is that the color of the dial becomes dull. My seiko SRPD had Hardlex and I had upgraded to a sapphire with 1 layer of AR. Now when I look at the dial the color just looks dull from when I had the original glass.
Thanks, that was good information
My Dan Henry 1962 chrono has an AR coating on the inside of the double domed saphire and it plays with the light beautifully
AR coating under the glass doesn't make much difference. I would say only 2~5% of reflection reduced.
Tnx.that was really useful. Unluckily, without any reason I found scratches on my seamaster omega. Can I remove arc completely safely? Will it be ok? Plz help me on this issue.🙏🙏🙏
Looks great when new, but the outside coating WILL get micro scratches with normal use. It is visible under direct sun at the right angle. My Breitling was the same. My SMP is only 6 months old, and babied. Already see extremely fine scratches in the AR coating in bright sun at the right angle. Now I look for it just because..............
I love ar coating, so my watch dont shines on my eyes lol 😸, the question is, can you re coat the crystal at a glasses lab?
Nice video… my question is how do I realize if the watch has a double layer inside and outside or just inside?
Great video. I have this problem with a Jaeger-Lecoultre watch which has a domed boxed section sapphire crystal. It only has AR under the crystal but it is still highly reflective. It also has a black dial so the reflections are even more obvious and annoying. Too bad JLC don't can't get me a sapphire with AR on it.
I've been trying to find a solution to this but to no avail... Just have to suck it up cos I love the watch itself. :(
What model watch is it? Is it like a dive watch or a dress one? I'm very curious: it seems a bit crazy that such pricey watches as JLC and AP and such only have under-sided AR coating, but they might be planning for them to be "archive grade" watches: ones that will look as good in 40 years as they do today. That's fine, but I like to use my watches today. lol. I wonder if you could find a place the would do deposit AR coating on the top side? If so I'm sure it would be very expensive, but it might be worth it to make the wearing experience that much better.
@@DrKnowitallKnows I have the AMVOX 1 (2006), which is quite old now. I emailed JLC directly and they told me that they only out AR on the underside to keep the sapphire scratch free. They said all JLC watches on have an underside AR coating. Now, here's the funny part - I also have a JLC Polaris (2018) and that definitely has double sided AR coating; I can see the blue hue and light scratches on it.
Perhaps, they've changed their policy now as they realise it's a good way to charge their customers for a new crystal. Haha!
I'm based in Hong Kong and I've been to several places asking for AR re-coating and they all said that it's almost impossible without the proper machinery in a lab.
@@alectang1614 Wow, that's quite the adventure there, just finding out what kinds of coatings are on these guys! It seems really odd that watch companies say this is so difficult while almost every pair of prescription glasses has AR coating on it. Maybe putting it on plastic is just easier than on sapphire. I sort of feel that if you have a flat crystal, 1 sided (or even no sided) AR is ok, but if it's curved/domed at all, that's when double sided is really important.
I hate that omega puts an AR coating on the outside of the crystal. I get that it may be beneficial but it scratches way too easily. I guess you could polish it off or something :/
Yeah I treat that watch like a baby because of that outside coating .I'd be perfectly happy with coating on the inside only.
Rolex has AR on the magnifier lens, and paneraize have internal only ar.
I own planet ocean 8900 and yes it did scratched on the coating . Very annoying , can we buff the Ar coating .?
You can have it removed, but be careful not to damage anything else in the process.
Good episode. What is your opinion of the Casio Rangemaster gw9400 1cr please?
I'm a big Casio fan, but sort of feel their G-shocks are over-engineered (and thus rather expensive) compared to just getting a normal Casio. I've beat the hell out of regular (not G-Shock) Casios and never ever had one die on me. Maybe I'm just nice on my watches, but my Casios are my beaters, so I don't treat them too nicely! :) If you'd like a whole episode on these guys, just send me a quick thumbs-up and I'll do one!
you can buy like for phones a protection window :)
The AR coating can be polish to remove the scratches?
Yes u can but after polishing, the outer layer of AR coating will be removed
How about screen protectors they use on smart watches over the AR coating.?
Interesting. I'll be sure I put it on the docket to ask him! (Lane, his wife)
how much does it cost to change the crystal on an omega seamaster 300m?
$200 for the crystal and $500 for service. So $700 total
AR coating on prescription eyeglasses is common even on plastic lenses and isn't costly at all, so I imagine the rationale is as you say, its poor scratch resistance performance.
Yes, I should've mentioned eyewear. I do find it "interesting" that most sources say it's very expensive to do AR coatings on watch crystals, while eyewear with AR is not terribly expensive. I should look into it more: perhaps putting AR on sapphire is harder to do than on glass/plastic? Or maybe the quality is higher or something? Or maybe they just like to tell you how hard to do it is so they can charge more ;) Certainly AR coating on a watch that costs thousands of dollars is a tiny fraction of the total cost (and $300-400 watches have AR coatings on them), so cost definitely shouldn't be a reason!
@@DrKnowitallKnows Even a $130 Nikon 50mm/F1.8 lens is AR coated on every lens element:
www.bhphotovideo.com/c/product/247091-USA/Nikon_2137_Normal_AF_Nikkor_50mm.html/overview
Rolex uses it now on the inside
good video. and wish you talk more about watches (if you want).
Regardless of what you feel about reflections, putting an AR coating on Sapphire Crystals is plain STUPID.
The only reason you want Sapphire as opposed to mineral glass is because it doesn't scratch.
The AR coating WILL SCRATCH, hence putting it on Sapphire makes it very scratch-able.
If you want an AR coating, just put it on mineral glass or chemically toughened glass!
1:14 into a Dr. Know-it-all video and he says something wrong. Rolex uses AR coating on the inside.
Depends on the year and model. Cyclops have been getting AR coating for decades. More recently some started getting AR coating on the inside. And more recently some started getting AR coating on both sides
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Все это интересно, но не очень понятно