This is a step-by-step process in producing common optical lenses. It is a great honor to see this video featured on How-To Geek: www.howtogeek.com/94612/how-it...
Hard copy archives will have loads and loads of measurements; it might be tedious to convert each one intermittently. Then again, if the reports are to be digitized -- and not in a static document format such as PDF -- programmers can simply develop an application to automatically detect and convert imperial units to S.I./metric units. I wouldn't be surprised if an XML-based standard for engineering work documents ever comes to fruition.
Rokinon/Samyang makes great lens (not all) on the cheap. They may be full manual but the optics are good. The automated components add quite a bit to the price.
did anyone else notice this annoying high pitched frequency noise? its in the video, and iv noticed this happens with other videos too. Imagine the brain wave scrambling!
That's because they technically aren't the same. The aperture is the actual measurement of the pupil of a lens. f/stop is a ratio between focal length and the diameter of the aperture. Though it is common for aperture and f/stop to be used as synonymous terms. At least you now know how it really works ;)
@GeezerRay This episode was most likely narrated with a script that accomodates the ordinary TV viewers in the United States. Metric standards are not used here much outside of academia; I suppose Americans can't immediately infer how a kilogram feels while looking at a particular object on the screen.
i have seen the videos about canon making its gigantic tele-lens i agree it looks chaotic, and nobody seams to clean a lens before inserting into the barrel but their lenses generally deliver good image quality, every canon lens above 100mm is really sharp, and the only ones that really suck are the ultra-wide angle ones and some consumer zooms
"...bending light rays so they converge into a common point, called the focal point..." Only light rays approaching the lens parallel to its axis will converge at the focal point. Unless the object you are viewing is very far away, light rays from that object will converge (and produce an image) at a location other than the focal point.
I did not take it, actually. It was on an officially licensed DVD from Glendale Community College (California). My professor had me use it for a research project. I ripped the video and posted it on TH-cam for educational purposes. I do not believe that this is stealing; this is a way to spread knowledge across the World Wide Web.
@Lifeintakes I think your not seeing the whole picture, the line of production its form by hundreds of personnel around the globe, its not just one person doing one lens. One does a small part of the lenses the whole day, so imagine he/she can work on a few dozens in one day. So he works "everyday" on one part,and then move to another person WHO its already working on another dozens by day. but the whole production of one lens its done in 6 weeks but a few hundreds came every day. :D
But you use it for measuring wooden planks. If you know that wood floats, and it has such and such dimensions, then you can calculate upper bond for its weight. Having 5 different units depending on what you're measuring is not comfortable...
Because if you use kilogram, meter and second, then you can derive units like newton, joule and watt, without usage of irrational constants that make physic's equations more complicated. Theoretically, you can start with pound, yard and second, and derive everything from it, but nobody did it. Maybe because mile has 1760 yards, and yard has 3 feet. Ask even American physicists what units they use when they do science.
No it's not. The f number is the ratio between the size of the aperture opening and the focal length of the lens. If the focal length is longer you need a bigger size aperture for the same f number. The f number is also called focal ratio or f-ratio.
@Aragiss Metric follows a very logical hierarchy indeed, but it may pose as a challenge if, one day, students are to reference past governmental reports/document for their research. Many years of scientific documentation in our public sector have rendered the U.S. system ubiquitous. Well, I suppose this just means that we should leave it to the motivated independent organizations to advance our scientific dreams (pardon my fallacious judgment).
It really doesn't matter anyway. No one system is more accurate than the other, but the Metric system is mathematically easier which can make it ideal. Albeit, don't discourage the fact that we Americans have an understanding of BOTH the Metric and Imperial systems, we choose to use the Imperial System for comfortability. Point is Americans can tell the relative differences between a kg and a lb. Most under the metric system can't comprehend what a pound is, yet alone the Imperial system.
i think because about 50% of the process is made by people not machines and even the other machine-dependent steps are also fully watched / controlled by people .
Yes they do. I like Asian stuff, hell Im eating Asian food right now. If you read my post I was talking about breaking child labour laws and what the quality of the item.
@megaflunky Um, that's the point. The US is (essentially) the only country that doesn't. US industry does, though, in order to be competitive. Well, it would if there WAS a US industry.
@Aragiss 'We idiots' use both just fine, in different applications. I find it troubling that no other country is smart enough to use both, so they stick to the simplistic metric system.
@TheMarkNessMonster I don't know when they were made. By "archaic" I meant, obsolete. Whatever, this discussion has got way too long and i'm rather bored with it. BB
@Aragiss One last thing, calling Imperial measurements archaic by comparison to metric measurements is like calling cubits archaic in comparison to bushels, which is a measurement still used today. Metric was invented in April 1795, so by any standard, neither is any less archaic. Enjoy not understanding my archaic measuring system, while I enjoy using both archaic measuring systems. Also, science has MANY systems of msmts. I mean, you wouldn't measure electricity in cm, now would you?
yet aperture size is in mm.. and f/number is a fraction... on industrial lenses are not the same... well.. getting the focal length and the pupil you can get the f/number... but to check the quality you must misure everything, if the f/number you calculate is different from the one you misured.. something has gone terribly wrong.
I have studied engineering and currently a photography student, so I fully appreciate both the good lens and complexities of making process. However, I can't understand why the company want humans involve so much during production. I'm sure all the technicians are very skilful, but that leave rooms for human errors and inconstancies. There are already machines and technologies out there that can do these jobs faster and more accurate. I think people should be quality checkers, but not makers.
@TheMarkNessMonster Well if more units you have the better it is... Then lets use many other units. Metric is too simple! Let's complicate things shall we?! There, I now name my nick "Aragiss" as a unit equal to 7,675 kilograms!
we have never said we want the world to switch to the old system again, frankly, we don't care if you do or not. If you do, we'll congratulate you, if you don't we don't care, because we know both systems. we just choose to use the imperial system more casually. and as i said before, we are almost as fluent with the metric as with the imperial system.
you don't have to be so harsh, what have we ever done to you? and so you can educate yourself on American cultures for the first time in your life obviously, we learn both, we are fluent with both, and we use them just the same amount as anyone else (well, maybe a little less), but we just use the imperial system more casually.
cameras don't cost that much its the lenses that are fucking expensive. my sister is a photographer and she bought a telescopic lens for 900 pound (the camera only cost her around 500)
Thing is, there is no logical explanation to why USA still hasn't even started adopting metric as the official means of measurement. The only explanation I can think of is that you don't change it because of the whole "our way of life" thing. You do not want to change according to the world, you want the whole world to live according to USA.
Interesting but I don't buy some of the information in this presentation or think it is really old. I am especially skeptical about it taking 6 weeks to create a lens, I bet it is much, much, quicker and mostly automated.
@GeezerRay Yeah I hate the damn Imperial units. I mean the whole world uses metric, they're much more convenient and scientific. Why do those idiots still use those archaic measurement units?!
@GeezerRay Why should Americans "figure out" what a kilogram is? A unit is just an arbitrarily agreed upon constant. Saying the kilogram is superior to the pound is just brainless snobbery.
I can't help to think breaking some child labor laws and assembly in air-less chambers by robots would do the trick... but then again I'm kind of playing an asshole.
I usually love Nvidia products but F this... seems to me they are trying everything they can to get consumer's used to the idea of tech in the cars to facilitate more personal intrusions. (SPYING)but the NSA and such. Or how about give those who would seek such power to control ( sabotage) your vehicle trough "smart tech" ! I know this tech is appealing in so many ways, however this is just a trojan horse devised to track, control, and or subdue any person against such actions
cant you work out how many kilograms in a pound yet? and no i am not American and i know how to convert metric to imperial, don't be so 1 sided and arrogant
![มองหน้ากันไม่ติด (Awkward) - โอ๊ต ปราโมทย์ FEAT. MAIYARAP [Official MV]](http://i.ytimg.com/vi/4b02SY_r6Gw/mqdefault.jpg)
god, that high-pitched noise in the background is about to make my head explode.
Thank you for the views and comments, everybody! I'm glad to see TH-cam users having so much interest in this video.
I work for a company that produces lenses like this, and the amount of R&D that goes on there is staggering.
@Aragiss I understand perfectly, and I am able to understand and apply both fluently, which is more than I can say for yourself.
Hard copy archives will have loads and loads of measurements; it might be tedious to convert each one intermittently. Then again, if the reports are to be digitized -- and not in a static document format such as PDF -- programmers can simply develop an application to automatically detect and convert imperial units to S.I./metric units. I wouldn't be surprised if an XML-based standard for engineering work documents ever comes to fruition.
@XionXi Yeah, engineers are brilliant people with amazing minds.
Rokinon/Samyang makes great lens (not all) on the cheap. They may be full manual but the optics are good. The automated components add quite a bit to the price.
did anyone else notice this annoying high pitched frequency noise? its in the video, and iv noticed this happens with other videos too. Imagine the brain wave scrambling!
That's because they technically aren't the same.
The aperture is the actual measurement of the pupil of a lens. f/stop is a ratio between focal length and the diameter of the aperture.
Though it is common for aperture and f/stop to be used as synonymous terms. At least you now know how it really works ;)
How can I get my hands on the background music to this video? I really like it
therefore the cost is very high.
the work of making a optical lens and assembly is highly skillful.
@GeezerRay This episode was most likely narrated with a script that accomodates the ordinary TV viewers in the United States. Metric standards are not used here much outside of academia; I suppose Americans can't immediately infer how a kilogram feels while looking at a particular object on the screen.
i have seen the videos about canon making its gigantic tele-lens
i agree it looks chaotic, and nobody seams to clean a lens before inserting into the barrel
but their lenses generally deliver good image quality, every canon lens above 100mm is really sharp, and the only ones that really suck are the ultra-wide angle ones and some consumer zooms
"...bending light rays so they converge into a common point, called the focal point..." Only light rays approaching the lens parallel to its axis will converge at the focal point. Unless the object you are viewing is very far away, light rays from that object will converge (and produce an image) at a location other than the focal point.
I did not take it, actually. It was on an officially licensed DVD from Glendale Community College (California). My professor had me use it for a research project. I ripped the video and posted it on TH-cam for educational purposes. I do not believe that this is stealing; this is a way to spread knowledge across the World Wide Web.
@Lifeintakes
I think your not seeing the whole picture, the line of production its form by hundreds of personnel around the globe, its not just one person doing one lens.
One does a small part of the lenses the whole day, so imagine he/she can work on a few dozens in one day.
So he works "everyday" on one part,and then move to another person WHO its already working on another dozens by day. but the whole production of one lens its done in 6 weeks but a few hundreds came every day.
:D
Excelente video.
@nonosh what he's saying is "very interesting", and it's very interesting indeed. Thanks for the video
Well, at least the people can now make their lens-purchasing decisions with better information/transparency. 'Cause knowledge is power!
wow...... so perfect
But you use it for measuring wooden planks. If you know that wood floats, and it has such and such dimensions, then you can calculate upper bond for its weight.
Having 5 different units depending on what you're measuring is not comfortable...
Because if you use kilogram, meter and second, then you can derive units like newton, joule and watt, without usage of irrational constants that make physic's equations more complicated. Theoretically, you can start with pound, yard and second, and derive everything from it, but nobody did it. Maybe because mile has 1760 yards, and yard has 3 feet.
Ask even American physicists what units they use when they do science.
@GodWillem Now try your second guess: menthol, or full-flavored?
No it's not. The f number is the ratio between the size of the aperture opening and the focal length of the lens. If the focal length is longer you need a bigger size aperture for the same f number. The f number is also called focal ratio or f-ratio.
@dx80cruiser Indeed.
Anyone know the name of the song in the first half of this video
Very surprised at the sections showing percision handlers without hair nets.
@Aragiss Metric follows a very logical hierarchy indeed, but it may pose as a challenge if, one day, students are to reference past governmental reports/document for their research. Many years of scientific documentation in our public sector have rendered the U.S. system ubiquitous. Well, I suppose this just means that we should leave it to the motivated independent organizations to advance our scientific dreams (pardon my fallacious judgment).
indeed it is
It really doesn't matter anyway. No one system is more accurate than the other, but the Metric system is mathematically easier which can make it ideal. Albeit, don't discourage the fact that we Americans have an understanding of BOTH the Metric and Imperial systems, we choose to use the Imperial System for comfortability. Point is Americans can tell the relative differences between a kg and a lb. Most under the metric system can't comprehend what a pound is, yet alone the Imperial system.
Interesting !
i think because about 50% of the process is made by people not machines and even the other machine-dependent steps are also fully watched / controlled by people .
7:54
'..Things like focal length, the f/ number, and the size of the aperture opening."
lol f/ number and aperture size are the same..
Yes they do. I like Asian stuff, hell Im eating Asian food right now. If you read my post I was talking about breaking child labour laws and what the quality of the item.
Yet human beings can just grow such a lens without any difficulties.
@megaflunky Um, that's the point. The US is (essentially) the only country that doesn't. US industry does, though, in order to be competitive. Well, it would if there WAS a US industry.
@GeezerRay We don't need to we don't use the metric system here
i wanna see them make those huge lenses that are like as long as your arm
@Aragiss 'We idiots' use both just fine, in different applications. I find it troubling that no other country is smart enough to use both, so they stick to the simplistic metric system.
I believe the artist is Kevin Tighe.
@TheMarkNessMonster I don't know when they were made. By "archaic" I meant, obsolete. Whatever, this discussion has got way too long and i'm rather bored with it. BB
@Aragiss One last thing, calling Imperial measurements archaic by comparison to metric measurements is like calling cubits archaic in comparison to bushels, which is a measurement still used today. Metric was invented in April 1795, so by any standard, neither is any less archaic. Enjoy not understanding my archaic measuring system, while I enjoy using both archaic measuring systems. Also, science has MANY systems of msmts. I mean, you wouldn't measure electricity in cm, now would you?
@GeezerRay Or at least they should have mentioned the per pound price.
Saw this episode a couple of days ago. Does anyone know who the music artist is?
yet aperture size is in mm.. and f/number is a fraction... on industrial lenses are not the same... well.. getting the focal length and the pupil you can get the f/number... but to check the quality you must misure everything, if the f/number you calculate is different from the one you misured.. something has gone terribly wrong.
I have studied engineering and currently a photography student, so I fully appreciate both the good lens and complexities of making process. However, I can't understand why the company want humans involve so much during production. I'm sure all the technicians are very skilful, but that leave rooms for human errors and inconstancies. There are already machines and technologies out there that can do these jobs faster and more accurate. I think people should be quality checkers, but not makers.
wow, now I know why lenses are so expensive.
@GeezerRay I can.
please help us a lot about the problem
@TheMarkNessMonster Well if more units you have the better it is... Then lets use many other units. Metric is too simple! Let's complicate things shall we?! There, I now name my nick "Aragiss" as a unit equal to 7,675 kilograms!
@TheMarkNessMonster Whatever man, you don't seem to understand my point here. Just keep using your archaic methods of measurement and I'll use mine.
A diamond is easier to cut then that damn glass.
the samyang 35 is amazing
Muy Interesante
we have never said we want the world to switch to the old system again, frankly, we don't care if you do or not. If you do, we'll congratulate you, if you don't we don't care, because we know both systems. we just choose to use the imperial system more casually. and as i said before, we are almost as fluent with the metric as with the imperial system.
What is the song in the background?
@drahmedelbatran Cheers!
now i know why my lens is expensive ..
Mmmm...actualy it is not....the f/number is a measurement from the focal length divided by the diameter of the entrance pupil(aperture)
you don't have to be so harsh, what have we ever done to you? and so you can educate yourself on American cultures for the first time in your life obviously, we learn both, we are fluent with both, and we use them just the same amount as anyone else (well, maybe a little less), but we just use the imperial system more casually.
cameras don't cost that much its the lenses that are fucking expensive. my sister is a photographer and she bought a telescopic lens for 900 pound (the camera only cost her around 500)
Thing is, there is no logical explanation to why USA still hasn't even started adopting metric as the official means of measurement. The only explanation I can think of is that you don't change it because of the whole "our way of life" thing. You do not want to change according to the world, you want the whole world to live according to USA.
Um, this IS a Canadian show.
No cheap and easy way to make a high quality lens.
@Aragiss It's not my fault you can't grasp a second system of measurements, you must not have had a very good math teacher.
Ok
Interesting but I don't buy some of the information in this presentation or think it is really old. I am especially skeptical about it taking 6 weeks to create a lens, I bet it is much, much, quicker and mostly automated.
I'm sure crappy 18-55's are made in half an hour, by two or three machines =P
"Most under the metric system can't comprehend what a pound is"
Do you even know what the word comprehend means?
and that's why cameras cost so much
@GeezerRay Yeah I hate the damn Imperial units. I mean the whole world uses metric, they're much more convenient and scientific. Why do those idiots still use those archaic measurement units?!
fucking background noise grinds my ears
$1000 for 2.2 pounds? Now wonder SLR lenses are so expensive.
Then tell me how much a cubic inch of water weighs in pounds.
And then tell with a straight face that imperial system is comfortable
yep he is just a narrator dude xD
@GeezerRay Why should Americans "figure out" what a kilogram is? A unit is just an arbitrarily agreed upon constant. Saying the kilogram is superior to the pound is just brainless snobbery.
Then, a shlummie comes and he rubs it. And spits on it.
...Haha... Aperture size and f number...
$1000 for 2.2lbs wow/lens ain't got no friends you gotta spend your money for sure on that
r
*worlds most boring job*
I can't help to think breaking some child labor laws and assembly in air-less chambers by robots would do the trick... but then again I'm kind of playing an asshole.
damn i thought it was condoms :@@
was he/she having a condoms on fingers? (@ 5:41)
I'm so happy! It's the regular guy! Not the painfully overtly punny woman or the host with the punchable face!
are they wearing condoms on there fingers?
I usually love Nvidia products but F this...
seems to me they are trying everything they can to get consumer's used to the idea of tech in the cars to facilitate more personal intrusions. (SPYING)but the NSA and such. Or how about give those who would seek such power to control ( sabotage) your vehicle trough "smart tech" ! I know this tech is appealing in so many ways, however this is just a trojan horse devised to track, control, and or subdue any person against such actions
cant you work out how many kilograms in a pound yet? and no i am not American and i know how to convert metric to imperial, don't be so 1 sided and arrogant
Breaking child labor laws only gets you cheap crappy Asian lens’s. There currently available anywhere cheap crap is sold, try ebay. LOL