HELP !! My Oriental lens supplier keeps talking about EMI coating, what is it?? Looks to me just like a good AR. Is there a difference??
HELP !! My Oriental lens supplier keeps talking about EMI coating, what is it?? Looks to me just like a good AR. Is there a difference??
That is the EMI HMC right?Originally Posted by Jacqui
Here I get OSA Lites HMC, so I think they are the same (Korean). From my understanding the company is owned by Essilor, and so far I have had not troubles with it. I am still testing it out though.
EMI stands for Electro Magnetic Interference which is designed to reduce radation from Computer screens and other source of EMI. Also acts like an Anti-Static Coating as well. Many imported lenses with A/R have this feature.
Why don't the American coatings have it?? or if they do why not say so??
We started getting this EMI coating here in Israel about 2 years ago.
It was fanfared in with much honour by the importer.
The lens rep came with some sample lenses and some sort of electronic meter scaled from 0 to 100 He placed the head of the meter one inch from an electrical plug outlet and the meter shot up to 100. He then took an EMI coated lens and placed it between the plug and the meter and sure enough, this special EMI lens reduced the reading to a low number.
Very impressive I thought, so I gave him my (then) 2 year old Panamic Trans 1.56 with Crizal and guess what????? The meter reading went down to the same low number WOW! I've been having this EMI protection for years and didn't know it.
I then tried other AR coated stock lenses and guess again?????
Yesssssss
Go Figure!
BTW, just a thought, how often do you place your spectacles one inch from an electrical outlet?
The point isn't really to protect your eyes from the electromagnetic field around an electrical outlet but the field coming off a CRT display, particularly a computer screen which we all tend to sit rather close to. In theory these coatings will reduce eye fatigue while using a computer, however summing the data I've seen there appears to be little quantitative statistically significant proof of this but a fair amount of anecdotal evidence indicates value.
It is worth noting that most of the lenses marketed as 'anti-static' have significant EMI shielding ability and even some AR coated lenses not specifically marketed as 'anti-static' will also provide EM shielding.
Can you tell what electronic meter device he used to measure ??
This EMI coating has been around for at least 8 years and is very popular in Japan and S. Korea. Lenses from those 2 countries are pretty much made with that coating now standard.
Um...did you mean Asian lens supplier? :bbg: I am an American but my company is Chinese and I live in China...am I also an Asian lens supplier? Confusing.
Doc
emi means electro magnetic infrence it works reduce reflaction of computer tv headlights of cars.its hv u v 400.
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