Dude. This is by far the best explainer on focal length that I've seen on UA-cam. I'm a 25-year veteran in the art of photography, but I always like rehashing the basics every now and again. Thanks for this video!! 👍🏾
Best video on focal length on youtube hands down. Concise and to the point and ACTUALLY EXPLAINED what focal length entails and not a dumbed down version that tells you nothing. Thank you. Subbed.
I love it when content such as this gives you "Ohhhhhhhh" moment, connecting multiple concepts together forging an even stronger understanding. Thumbs up for that.
Agree with many here … never seen a better explanation of this subject, along with the overlays to articulate it soooo well!!! My 8 year old learning photography absolutely adored it! Many thanks!
Brief and simple to understand and very informative. It has answered many questions that many other longer videos on UA-cam could not explain. Excellent!!!!!
Bravo! You just answered several longstanding, nagging questions I’ve had about this topic that all the textbooks don’t treat well or ignore entirely. Showing the path of the light and the point of convergence layered on an image of the camera and lens was a brilliant way to communicate this information. Thank you!
came across your channel few days ago. you deserve way more subscribers Dave!.. the way you explain is easy to understand, the graphical overlays are simple but effective. Great content.
very good explanation, I always watch youtube photographers that say they don't want to jump into the math and annoy us till I figured out that they actually don't know anything about it. however, I think any person who call himself a photographer needs a basic understanding of camera electronics and optics, so great job and I am looking forward for more content like this.
Best video on this topic. I have been looking, and no one is as clear and precise with the best examples. Thanks so much for doing this - I was pulling what little hair I have out!! Great job.
I went to photography school and that’s basically how it was explained and yet back then we have no idea what a digital camera could do, like none. We did most of our assignments on film and it was explained the same way but using “film” instead of a digital sensor. In fact I got the basic idea in my head that it isn’t what most people think because they’re not technically trained to think that way. Now when I pick up a lens that is either a fixed or a zoom or macro I see this measurement from that converging line of focus and the distance to my sensor being the measurement I’m intending on using.
I spend a lot of time finding a clear explanation about the focal length until I saw this vid! Loud voice plus clear explanation = great and really helpful video. Approved 😉👍
this is amazing. I spent soo much time watching many videos, but none of them got straight to the point like this guy. this video is informative and straight to the point. Nice one man....
You should mention why Nikon, on there mirrorless cameras, moved the lens closer to the sensor with the larger rear element size. If you use a 50mm Z mount lense it is closer to the sensor than if you use the 50mm F mount lense with the adaptor.
👍Good time use, not wasted at all. Love the simple but very clear overlay diagrams, along with vid focus changes, and the inversion. A keeper. Don’t recall seeing other vids use your effective overlay technique - instead they cut away to charts, sometimes hand drawn.
Best explanation ever ... point of convergence was deal killer. No body explained like you did. I saw 10 videos and I was all confused but not any more! Thanks!
Great diagrams to explain. I what the focal length was the distance, but didn't think about how that affects the field of view and therefore the size of the lens.
As an optician it was very difficult for me to understand the meaning of focal length in photography and i was really confused But you explained it very well and made me clear Thank you bro Uncle k1❤
Very highly informative video on this topic, you clearly explained everything so that an alien would also easily understand !!! Nobodycan perfectly and correctly explain it more than you !! Hat off !!!
Thank you so much for this super clear explanation of focal length. I finally understood it, thanks to you! Brilliant job, thank you for using those lines! 👍😁🙏
hi Dave, thank you so much. so the point of convergence is somewhere within the lens, not on the sensor. That is a very important piece of information. I will check your other videos. thanks again. we need more science about photography.
Thanks for solving the mystery of the day for me but from what you have just described for me and what I have read about the how to calculate focal lenth yourself but I guess I have plenty of time to work it all out for myself chhers mate
...give us info relevant to APS-C sensor and not recalc for FF. Checking the angle of wiew for a specific lens is, but is there a standard for such indications? Otherwise, if we see "50" on the lens for APS-C camera, should we take it as it is or recalc asuf it was a "FF 50" that will give us 75mm for APS-C?
I'm pretty sure the overlay illustration from about 1:48-1:56 is incorrect. It shows light rays entering the lens, then getting refracted to a convergence point, thus getting "flipped over", and then straightening out. It's that last part that is incorrect. This implies that there is some king of lens, presumably back in the camera body, that straightens out the light rays. This is not correct. The splaying light rays simply hit the sensor and are thereby recorded.
Best explanation on this subject ever.
agreed
Agreed!
agreed
disagreed. The explanation is very clear but wrong.
@@Mateo1982able how? Not very helpful to just say he's wrong, tell me how to find out the real answer, by explaining what exactly he got wrong
Nobody on youtube is as clear as you are in explaining stuff ! Great work !
ya, bro u are so clear. Thank you.
Dude. This is by far the best explainer on focal length that I've seen on UA-cam. I'm a 25-year veteran in the art of photography, but I always like rehashing the basics every now and again. Thanks for this video!! 👍🏾
3:49 to 3:53... most clear visual aid ever sir! Thank you, I never understood WHY until this very simple animation.
EXACTLYYYY
Best video on focal length on youtube hands down. Concise and to the point and ACTUALLY EXPLAINED what focal length entails and not a dumbed down version that tells you nothing. Thank you. Subbed.
This is a really good video.
I love it when content such as this gives you "Ohhhhhhhh" moment, connecting multiple concepts together forging an even stronger understanding. Thumbs up for that.
Agree with many here … never seen a better explanation of this subject, along with the overlays to articulate it soooo well!!! My 8 year old learning photography absolutely adored it!
Many thanks!
Simple and straight forward explanation... That is Dave's style.
Explanation and simple graphics made this a total winner. Thank you!!
Brief and simple to understand and very informative. It has answered many questions that many other longer videos on UA-cam could not explain. Excellent!!!!!
Very insightful. I learned something about focal length that I didn’t know before.
I have watched literally dozens of videos on focal length trying to get my head around it and this is hands down the best explaination.
Bravo! You just answered several longstanding, nagging questions I’ve had about this topic that all the textbooks don’t treat well or ignore entirely. Showing the path of the light and the point of convergence layered on an image of the camera and lens was a brilliant way to communicate this information. Thank you!
Thank you for taking the time to put the graphics on your hand movements during your excellent explanation. Tip top
Thanks!
Nobody explains this topic so great as you did. Great job!
Best explanation on UA-cam. Thank you mate.
came across your channel few days ago. you deserve way more subscribers Dave!.. the way you explain is easy to understand, the graphical overlays are simple but effective.
Great content.
This video will never get old. Thank you. Clear and concise.
This reminded me of the same topic back in my third grade in my high school. now i can connect the dots. thanks man.
Finally, someone who doesn't just say "the higher the number, the more zoomed in it is"
Awesome video!
I am photographer for nearly 10 years...I never thought about this...This makes totally sense suddenly!Thank you very much for the lesson !
very good explanation, I always watch youtube photographers that say they don't want to jump into the math and annoy us till I figured out that they actually don't know anything about it. however, I think any person who call himself a photographer needs a basic understanding of camera electronics and optics, so great job and I am looking forward for more content like this.
Thanks Nader, I already have a few other videos similar to this on my channel but no doubt there will be even more in the future 😊
Best video on this topic. I have been looking, and no one is as clear and precise with the best examples. Thanks so much for doing this - I was pulling what little hair I have out!! Great job.
Thanks so much for the explanation! I was meaning to look this up sometime, and your video just came up. Great explanation!
Absolutely fantastic. Before I clicked the video, I really was not expecting to learn so much, geez.
Thanks, glad you enjoyed it ☺️
this is the best explanation on youtube
I went to photography school and that’s basically how it was explained and yet back then we have no idea what a digital camera could do, like none. We did most of our assignments on film and it was explained the same way but using “film” instead of a digital sensor. In fact I got the basic idea in my head that it isn’t what most people think because they’re not technically trained to think that way. Now when I pick up a lens that is either a fixed or a zoom or macro I see this measurement from that converging line of focus and the distance to my sensor being the measurement I’m intending on using.
Nice explanation!! Cleared my Focal length and lens size doubts!!
Brilliant best and easiest to understand video on focal length I've ever seen.
Glad it was helpful!
Excellent video Dave, im in for version two of this :)..keep em coming. Huge Thanks!
Haha, that maybe something for the future 😊
Dude this explanation was PHENOMENAL
AWESOME.....great work and masterfully explained ! 👍
Bro you deserve the Nobel Peace prize for this explanation and break down of this SM!
I spend a lot of time finding a clear explanation about the focal length until I saw this vid! Loud voice plus clear explanation = great and really helpful video. Approved 😉👍
Great video
this is amazing.
I spent soo much time watching many videos, but none of them got straight to the point like this guy.
this video is informative and straight to the point.
Nice one man....
Самое лучшее объяснение темы, из тех которые я встречал на просторах сети. Спасибо!
best illustration about this topic so far! thanks!
You're welcome 😊
Jesús never heard a clearer explanation for this topic cheers mate!
Simple, easy and best explanation. Great job dude
You should mention why Nikon, on there mirrorless cameras, moved the lens closer to the sensor with the larger rear element size. If you use a 50mm Z mount lense it is closer to the sensor than if you use the 50mm F mount lense with the adaptor.
👍Good time use, not wasted at all. Love the simple but very clear overlay diagrams, along with vid focus changes, and the inversion. A keeper. Don’t recall seeing other vids use your effective overlay technique - instead they cut away to charts, sometimes hand drawn.
A very fine refresher...Thank You Dave...
Super great video with fantastic explanation, even a beginner will fully understand this
Am I the only one AMAZED by his motion tracking !!?
Excellent, I searched and now I found your simple explanation of what mm measurements on a lens means. Big thank you.
Best explanation ever ... point of convergence was deal killer. No body explained like you did. I saw 10 videos and I was all confused but not any more! Thanks!
Thank you for not dumbing it down. Trying to make the explanation "simple" to often only makes it confusing.
Excelllent, clear and concise tutorial. Brilliant!
Glad it was helpful Peter
An excellent explanation. Clear and to the point.
Others have commented this already, but this explanation is the best I've seen, I finally understand focal length.
That was the best video on focal length I have ever seen. Thanks so much, I learned a lot.
Great diagrams to explain. I what the focal length was the distance, but didn't think about how that affects the field of view and therefore the size of the lens.
Thank you for the explanation! I watched a few other videos and couldn't completely make sense of it until yours. Great job!
Man, super content: clear and compact !
I agree with other comments , the best video explanation on this subject.
Well done Dave
Excellent my man! Been racking my brain. Thank you
Finally someone who has explained this perfectly - thankyou!
Excellent explanation in regards to focal length distance, angle of view, aps-c vs full frame sensor, and physical size/length of lens.
THANK YOU!! Best explanation on the internet
As an optician it was very difficult for me to understand the meaning of focal length in photography and i was really confused
But you explained it very well and made me clear
Thank you bro
Uncle k1❤
THANK YOU SIR
Absolutely cracking explanation! Thank you
Great video. You cleared up some misconceptions that I had. Subbed. Thx!
Fantastic video. Well put together
Thank you! Finally a good explanation on this topic!
This is the best one on this subject I have ever seen
Thanks 😊
Very highly informative video on this topic, you clearly explained everything so that an alien would also easily understand !!! Nobodycan perfectly and correctly explain it more than you !! Hat off !!!
Small point: the image is not upside down, but rotated 180 degrees. Up is down AND left is right.
or flipped in both the horizontal and vertical plane. The same effect as rotation, accept rotation implies a motion that doesn't occur.
It is upside down then. ;)
David Marquez yes and left side right, which was the point of the comment...
Edward Noble to be precise an inversion occurs, not a double flip, that implies flips that do not occur...
"Up is down" that is the meaning of upside down
The only channel (I’ve seen) to actually say what focal length is.
Simple topic, explained simply. Perfect!
Amazed by the explanation!!
OMG, your diagram is off the charts! Thank you!
Brilliant! Good work man!
Great video with a simple explanation!
Best explanation I've heard. Great video!
Thank you so much for this super clear explanation of focal length. I finally understood it, thanks to you! Brilliant job, thank you for using those lines! 👍😁🙏
Best explanation by far! 👌🏻🔥
Perfectly explained
finally i learned the science behind focal length, thank you very much sir
Truly a great explanation.
Amazing bro looking for the right awnser and theory and you video was the awenser thanks so much well done explaned
hi Dave, thank you so much. so the point of convergence is somewhere within the lens, not on the sensor. That is a very important piece of information. I will check your other videos. thanks again. we need more science about photography.
As simple as it could get. Keep it goin'
Best by far explanation on this subject....thank you ..
Thank you Jim :)
the brain does not compensate anything. we live hanging from the ground.
THIS VIDEO IS AMAZING!
THANK YOU SIR!
great explanation, both verbally and visually
Thank you 😊
Thanks. This makes so much sense.
Learned from you the easy way. Thanks, chief.
I am so learning from a true master - thank you! 😎👍
I suspect we all are - ouch ;)
Excellent video! Very well explained!
An excellent explanation of focal length, exactly what I came here for, thanks 👌
Thanks man! Clearest explanation!
Thanks for solving the mystery of the day for me but from what you have just described for me and what I have read about the how to calculate focal lenth yourself but I guess I have plenty of time to work it all out for myself chhers mate
Great work I have just got the ultimate explanation thanks
Thanks for this video! The only topic left uncovered is how we can know if figures of FL we see on the lens for, say, APS-C camera
...give us info relevant to APS-C sensor and not recalc for FF. Checking the angle of wiew for a specific lens is, but is there a standard for such indications? Otherwise, if we see "50" on the lens for APS-C camera, should we take it as it is or recalc asuf it was a "FF 50" that will give us 75mm for APS-C?
I believe this video will answer your question
ua-cam.com/video/500FxQr92UQ/v-deo.html
I'm pretty sure the overlay illustration from about 1:48-1:56 is incorrect. It shows light rays entering the lens, then getting refracted to a convergence point, thus getting "flipped over", and then straightening out. It's that last part that is incorrect. This implies that there is some king of lens, presumably back in the camera body, that straightens out the light rays. This is not correct. The splaying light rays simply hit the sensor and are thereby recorded.