Teachers like you would improve the students a whole lot, the simplicity you bring to the complex maths, yet not degrading the core concepts is something rare & will surely bring the curiousity of any student up, just like it did for me! I'm so glad I found this video series! Please keep it up & bring more videos!
These three videos are really great and informative. As an engineer, I appreciate the science behind these parameters. Most people explain these parameters in terms of what they give as results in the context of photography, rather than explaining the physics behind it. I'd really love to see more content like this! Maybe discuss these topics: focal length, crop factor, adapters and teleconverters, macro lenses and minimum focus distance, chromatic aberration... etc.
This is one of the best content I have come across on TH-cam. It's absolutely high-yield and straight to the point. It's hard to find these kinds of explanations nowadays. Please continue making these types of videos so that we can have better visualization of how the camera works. Thank you for this video series.
I've watched this four times and recommended it to a friend because it's just THAT good. One of the best ways I've seen f-stops explained, thank you so much!
This video is pure gold. Thanks a lot for making it! As a software engineer, the math was very appreciated and made me really understand where that f number comes from.
First of all, fantastic explanation. I just want to clarify the algebra @ 9:45 for some folks. When he says to divide by sqrt2, he's referring to actually getting the next smaller F-stop number for the corresponding aperture. The fact that he's doing it on the equation itself, is just to avoid having to write a separate equation for the F-stop calculation. Yes, you would not multiply on one side of the equation and divide on the other...of course not, that makes no sense. Just realize, he's showing the dividing of sqrt2 as a side calculation for finding the next lower F-stop number in size. I could see this being a tiny bit confusing for some people that know algebra.
THANK YOU!!! THIS comment saved me from head banging my head against a steel grate. I've done calculus before and I was feeling terrible from not understanding why he was dividing one side while multiplying the other to balance the equation. It actually made no sense. You cleared it up for me. I feel much better now and can use the knowledge I aquired. IThank you so much man. You ARE the chosen one.
By FAR the best video on aperture and F stops. I came to this video from your video on aperture and DOF and was amazed by both. I don't even really care about learning about ISO but I saw you have a video on that so off to it now
1000 thank youz , awesome stuff , just picked up a Canon 5D EOS Mark II , currently I’m shopping for some lenses , I been wanting A full frame sensor since the camera came out in 2008 2009 , got a great deal on it , but thanks for the refresher needed that brother , headed out west in. Few months hitting California costal region , landscape , coastal , big salute 🫡
Brilliantly explained what f-stop actually is, I was kinda questioning myself what 1.8 aperture really means, what is 1.8? Is it mm is it cm is it inches is it litre is it km is it miles is it Gallons WHAAAAT is 1.8 WHEEREE is the measuring unit, cuz f-stop is not a measuring unit, it's just an understanding term that we all agree on, then I found your video which clearly answered my question. I bet 8/10 photographers and photography teachers doesn't know this much about aperture.
Instead of using the square root of 2, you can just use the formula for the area of a circle to do your calculations. It may take longer to do, but it makes more sense
Your teaching skillz is sick bro. Why you (f)stop making content? Please make more photog content!!! I hope and pray you’re doing well and haven’t gotten sick or depressed. Cheers bro!!
Nice video, although I think more attention should be paid to the somewhat hasty distinction made at the end between the entrance pupil and the aperture itself. Throughout the entire video, the diameter in the f-number equation was referred to as the diameter of the aperture. This is technically correct, because you later revisited at the end to clarify that it was the "diameter of the aperture _as viewed from the front of the lens_", although it was misleading for a number of reasons. For one, it doesn't explain why the diameter of the aperture changes automatically with focal length to keep the f-number constant. This is key to understanding why you can admit the same amount of light (same f-number) at different fields of view. While I understand this probably goes beyond the scope of the video, I think it's a potential source of confusion that should be cleared up during the course of teaching the topic, and not after.
Hi Dylan, what is the logic behind using the square root of two to determine what mm size f-stop to use? Is there a relationship between the diameter of the aperature and the area of the aperature?
Hey man great video, but i noticed that when you explain the multiplication of the aperture's diameter with the square root of two, you refer to the erea of aperture with the quantity of mm and I think it will be more correct if you said square milimetres (mm² ). Right?
Amazing, I love the explanation from a scientific perspective. I always followed the rules of photography, and didn't really understand how it worked until now.
WOW! Best video about f-stops EVER! What do you use to draw like that? Im looking for something similar for work (if you you that with a pencil, not your mouse)
hi, I hoped I would see more videos about the physics of photography. It is sad not to see. You are an outstanding teacher. I wonder If you know the physics of the sensor. best.
I have some questions, and I'd really appreciate if you answered 1. please tell a little more about focal length, you said focal length is the distance between object and lens and in another video I learned that focal length is the distance between the point where lens focuses the light and the sensor, in the end of your video you said those focal lengths (~20mm) is the size that your aperture would look like if you looked in the lens from up front, now here is my main question related to this, how does 10mm or 100mm decides size of field of view, everyone says it does, no one tells why Why is 10mm a wide lens and 100mm a telephoto? what exactly decides the size of view field and what is focal length, I've heard 3 different definitions for it that I said about, above, two descriptions in this very video 2. are these f stops just numbers derived to control diameter size or are they size of some actual physical surface too? I mean in f/2.4, Is 2.4 length of something too? I understood some things in the video though, and how does this affect depth of field?
Focal length is the distance between the point where light focuses and the lens itself. This video provides some more insight on the aperture vs entrance pupil: th-cam.com/video/OaSq0ES1ArE/w-d-xo.html
The f-stop equation tells us that f# = focal length / diameter. Thus to let the same amount of light in (same f#) at a longer focal length, the diameter must also increase. The trick is that the diameter being referred to here is not the physical aperture size, but rather the diameter of the "entrance pupil", which is the diameter of the aperture as it is magnified through the lens - it is how wide we would perceive the aperture if we looked at it from the front of the camera. This video sheds some light on this: th-cam.com/video/OaSq0ES1ArE/w-d-xo.html
Correct. Not the only thing that isn’t quite accurate, but the best video I’ve seen so far on that topic regarding useful information for a photographer without getting too deep into physics.
I have a lens that have f stop numbers (3.5-6.3) that are not on the scale you show. Does this indicate anything in particular? Might is have something to do with the fact that it’s a Nikon DX lens? Wonderful video, thanks!
If you treat the subject as a point light source a finite distance away (not infinite) from the lens, the light rays will emanate out from that source in all directions. Disregard the aperture for a second. The subjects (point light sources) that you can see in the image are set by the field of view, which is determined by the focal length. A longer focal length means a smaller field of view (more zoomed in). Now bring the effect of the aperture again. Since rays from the point source spread out in all directions, light from an object, as long as it's in the field of view, will strike the lens in all locations, both at points where the ray's entry to the sensor is blocked by the iris and points where it isn't. Thus, light from the object will still be able to reach the sensor, although the total amount of light is diminished. Thus, the smaller the aperture, the dimmer the object, yet aperture has no effect on the field of view.
![The Wall Song ร้องข้ามกำแพง | EP.213 | กรีน อัษฎาพร | 3 ต.ค. 67 [1/5]](http://i.ytimg.com/vi/3KrlLbCsadI/mqdefault.jpg)
Teachers like you would improve the students a whole lot, the simplicity you bring to the complex maths, yet not degrading the core concepts is something rare & will surely bring the curiousity of any student up, just like it did for me! I'm so glad I found this video series! Please keep it up & bring more videos!
This is an outstanding piece of teaching Dylan. Thank you.
These three videos are really great and informative. As an engineer, I appreciate the science behind these parameters. Most people explain these parameters in terms of what they give as results in the context of photography, rather than explaining the physics behind it. I'd really love to see more content like this! Maybe discuss these topics: focal length, crop factor, adapters and teleconverters, macro lenses and minimum focus distance, chromatic aberration... etc.
Agree, would love to see the series of videos to continue.
@@andrey730 Me too, Vey much love to see the next video
This is one of the best content I have come across on TH-cam. It's absolutely high-yield and straight to the point. It's hard to find these kinds of explanations nowadays. Please continue making these types of videos so that we can have better visualization of how the camera works. Thank you for this video series.
If you are looking for a nerdy mathematical explanation, you are at the right place.
Thanks a lot, Dylan .
I've watched this four times and recommended it to a friend because it's just THAT good. One of the best ways I've seen f-stops explained, thank you so much!
@Angus West i keep rewatching that part too
This is the best explanation of F Stop I've ever seen ... mathematically, it all now makes perfect sense, and it will be hard to forget!
This video is pure gold. Thanks a lot for making it! As a software engineer, the math was very appreciated and made me really understand where that f number comes from.
Excellent Work. The newer videos don't compare with the knowledge that you pass on in this video. Thank you.
First of all, fantastic explanation. I just want to clarify the algebra @ 9:45 for some folks.
When he says to divide by sqrt2, he's referring to actually getting the next smaller F-stop number for the corresponding aperture. The fact that he's doing it on the equation itself, is just to avoid having to write a separate equation for the F-stop calculation. Yes, you would not multiply on one side of the equation and divide on the other...of course not, that makes no sense. Just realize, he's showing the dividing of sqrt2 as a side calculation for finding the next lower F-stop number in size. I could see this being a tiny bit confusing for some people that know algebra.
THANK YOU!!! THIS comment saved me from head banging my head against a steel grate. I've done calculus before and I was feeling terrible from not understanding why he was dividing one side while multiplying the other to balance the equation. It actually made no sense. You cleared it up for me. I feel much better now and can use the knowledge I aquired. IThank you so much man. You ARE the chosen one.
the very few video that actually explain the fundamentals using first principles
Great explanation. Thank you. I'm a retired science teacher, and this would go into my curriculum unedited.
These are so amazing, I really wish you continued and made the other videos you promised! You have no idea how helpful they've been to so many people!
This is amazing! So clear and easy to understand! You did a great job, thank you!
I finally get it completely. Thanks.
By far the best explanation I've seen
Excellent explanation of F-Stop. I love Dylan's videos, he always explains things crystally clear.
Awesome video 🙌 The very first video where I see the actual physics of F stops explained with equations 🙌
Dylan, thank you for these videos. Please make more! You teach photography concepts like no one I've seen on TH-cam.
This is really good. I was thinking "A simple explenation of F-Stop" that is 15 min long, was kinda crazy, but the way you do it is spot on.
Wow. I’m embarrassed that I’ve been in the camera department for 10 years and only just now got a good explanation of stops. I appreciate it.
Wonderful fundamental explanation. Not many pro photographers would be knowing this.
your explanation is so simple and easy to understand. thank you for sharing
Thank you for this video. Just the information I was searching for a long time
Very well explained, got a dslr couple of day's ago and this video just blew my mind
I came to learn about Photography. Ended up learning Maths, Physics and Photography. Excellent explanation
This is such a brilliant video. So well presented and explained, it's the best video i have seen on f stops. Thank you.
Absolutely brilliant explanation. Thank you.
Excellent again, as are all your training videos. Logical and clear!
Thank you
By FAR the best video on aperture and F stops. I came to this video from your video on aperture and DOF and was amazed by both. I don't even really care about learning about ISO but I saw you have a video on that so off to it now
1000 thank youz , awesome stuff , just picked up a Canon 5D EOS Mark II , currently I’m shopping for some lenses , I been wanting A full frame sensor since the camera came out in 2008 2009 , got a great deal on it , but thanks for the refresher needed that brother , headed out west in. Few months hitting California costal region , landscape , coastal , big salute 🫡
Just the type of instruction I've been looking for. Good job Dylan.
All I can say: wow! you're really a super awesome teacher.
Yes, this is really great. The whole set of Dylan's videos are the best. Thank you!
Brilliantly explained what f-stop actually is, I was kinda questioning myself what 1.8 aperture really means, what is 1.8? Is it mm is it cm is it inches is it litre is it km is it miles is it Gallons WHAAAAT is 1.8 WHEEREE is the measuring unit, cuz f-stop is not a measuring unit, it's just an understanding term that we all agree on,
then I found your video which clearly answered my question.
I bet 8/10 photographers and photography teachers doesn't know this much about aperture.
Thank you so much, I now properly understand the aperture scale!
That's by far the best video i've seen about aperture sizes... all the big channels should hide if something like this pops up in the recommendations!
Very useful and in simple language. Thanks for sharing this nice video.
Reminded me of my school Physics Optics lesson. Thanks. Well explained
Instead of using the square root of 2, you can just use the formula for the area of a circle to do your calculations. It may take longer to do, but it makes more sense
THANK YOU!! That was an awesome explanation.
Excellent explanation, awesome work!
Such a clearly explained video that helps to understand what all the popular filmmaking TH-camrs are saying!
this might be the most beautiful thing on yt
Brilliant video, explains f stops so well
This is a perfect video. Thank you.
DOUBLE!!!
You are the teacher I have been looking for!!! Thank you very much! Sub.👌👌
Excellent video and explanation.
Sooooooo helpful Dude. Thank you for this. Keep it up.
Great teaching skills... Thanks.
Your teaching skillz is sick bro. Why you (f)stop making content? Please make more photog content!!! I hope and pray you’re doing well and haven’t gotten sick or depressed. Cheers bro!!
a great and simple explanation, Thank you!
Nice video, although I think more attention should be paid to the somewhat hasty distinction made at the end between the entrance pupil and the aperture itself. Throughout the entire video, the diameter in the f-number equation was referred to as the diameter of the aperture. This is technically correct, because you later revisited at the end to clarify that it was the "diameter of the aperture _as viewed from the front of the lens_", although it was misleading for a number of reasons. For one, it doesn't explain why the diameter of the aperture changes automatically with focal length to keep the f-number constant. This is key to understanding why you can admit the same amount of light (same f-number) at different fields of view. While I understand this probably goes beyond the scope of the video, I think it's a potential source of confusion that should be cleared up during the course of teaching the topic, and not after.
Hi Dylan, what is the logic behind using the square root of two to determine what mm size f-stop to use? Is there a relationship between the diameter of the aperature and the area of the aperature?
This is great! Thank you.
Hey man great video, but i noticed that when you explain the multiplication of the aperture's diameter with the square root of two, you refer to the erea of aperture with the quantity of mm and I think it will be more correct if you said square milimetres (mm² ). Right?
this entire video could be called aperture science!
Amazing, I love the explanation from a scientific perspective. I always followed the rules of photography, and didn't really understand how it worked until now.
Area is mm^2, not just mm. Just being pedantic. Also, it might be good to explain why it is rt(2) because of the area of a circle being pi*r^2.
Correct. This video originally had an annotation on it that noted it is actually sq mm, but then TH-cam got rid of annotations. 🙄
Dylan Bennett could you say your email, I would like to ask some questions
Great explanation!
Give this man an oscar!
thanks very much this really helped me.
Very helpful, thanks.
Excellent explanation
it's so good.. loving it
Super informative!!! Great content thanks!!!!
Excellent content!
Thank you. Thank you. Thank you.
WOW! Best video about f-stops EVER!
What do you use to draw like that? Im looking for something similar for work (if you you that with a pencil, not your mouse)
this is the video I was looking for ! Aswome work
Genius level!
wait so why is multiplying/dividing by squareroot of 2 give you the next stop? when r = 2*sqroot(Area/pi)?
incredible video!!
Wow, thank you so much.
This is excellent!
hi, I hoped I would see more videos about the physics of photography. It is sad not to see. You are an outstanding teacher. I wonder If you know the physics of the sensor. best.
Great post, thank you!
I have some questions, and I'd really appreciate if you answered
1. please tell a little more about focal length, you said focal length is the distance between object and lens and in another video I learned that focal length is the distance between the point where lens focuses the light and the sensor, in the end of your video you said those focal lengths (~20mm) is the size that your aperture would look like if you looked in the lens from up front,
now here is my main question related to this, how does 10mm or 100mm decides size of field of view, everyone says it does, no one tells why
Why is 10mm a wide lens and 100mm a telephoto? what exactly decides the size of view field and what is focal length, I've heard 3 different definitions for it that I said about, above, two descriptions in this very video
2. are these f stops just numbers derived to control diameter size or are they size of some actual physical surface too? I mean in f/2.4, Is 2.4 length of something too? I understood some things in the video though, and how does this affect depth of field?
Focal length is the distance between the point where light focuses and the lens itself. This video provides some more insight on the aperture vs entrance pupil: th-cam.com/video/OaSq0ES1ArE/w-d-xo.html
excellent video, do you have other videos as well like you say in the videos besides the DOF and ISO?
fantastic!
Please make more of these videos!
I would love an explanation of how changing focal length affects the aperture
The f-stop equation tells us that f# = focal length / diameter. Thus to let the same amount of light in (same f#) at a longer focal length, the diameter must also increase. The trick is that the diameter being referred to here is not the physical aperture size, but rather the diameter of the "entrance pupil", which is the diameter of the aperture as it is magnified through the lens - it is how wide we would perceive the aperture if we looked at it from the front of the camera. This video sheds some light on this: th-cam.com/video/OaSq0ES1ArE/w-d-xo.html
Wow, That was great, thanks.
Very helpful ❤
Wonderful !!
Great vidso thank you ! It REALLY helped understanding the concept :D
Area unit is mm^2 though :p
Correct. Not the only thing that isn’t quite accurate, but the best video I’ve seen so far on that topic regarding useful information for a photographer without getting too deep into physics.
This is the first time I see the big picture of aperture (haha that idiom was not meant to be a pun but it works!)
This guy deserves more subscribers
I have a lens that have f stop numbers (3.5-6.3) that are not on the scale you show. Does this indicate anything in particular? Might is have something to do with the fact that it’s a Nikon DX lens?
Wonderful video, thanks!
superb
Very well explained. Learnt a lot from it. Than you.
Thank you
Those disliking this video are those who never paid attention to their science teachers 😂😂😂
excellent!
what does the 'f' stand for and why is it cold 'stop'?
Below = a part spiral-- area of fx = dx -- both primed many, derivatives.
If closing down the aperture means blocking the lights on the edges, why doesn't that crop the image?
If you treat the subject as a point light source a finite distance away (not infinite) from the lens, the light rays will emanate out from that source in all directions. Disregard the aperture for a second. The subjects (point light sources) that you can see in the image are set by the field of view, which is determined by the focal length. A longer focal length means a smaller field of view (more zoomed in). Now bring the effect of the aperture again. Since rays from the point source spread out in all directions, light from an object, as long as it's in the field of view, will strike the lens in all locations, both at points where the ray's entry to the sensor is blocked by the iris and points where it isn't. Thus, light from the object will still be able to reach the sensor, although the total amount of light is diminished. Thus, the smaller the aperture, the dimmer the object, yet aperture has no effect on the field of view.
(why is everyone finding this 8 years later)
is there a time you would ever want/need to know the diameter?
Thanks lot😍