The truth about the inverse square law of light
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- Опубликовано: 14 окт 2024
- Let's talk science!
the truth about the inverse square law of light
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👧🏻 KAYDENCE: / kaydencefrank
👓 DANIEL: / danielnortonphotographer
/ danielnorton
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#dnphoto #lightingbasics #danielnortonphotographer
Great explanation for the Stills side of the art.
Addition for the Cinema and TV side, is that the same distance for the third image, is where two actors lit by the single light have nearly identical exposure, making it so they can move around within a zone where their exposure does not change during a scene or take. This why filmmakers use giant shades, diffusers and bounces, to regain the softness of a large source while having the source a long distance from the performer.
The camera will also be further back and lens longer, to avoid getting the falloff to the sides in the frame.
I did this once by accident and have been trying into figure out how to recreate this on purpose. Thanks.
That was very helpful. Thank you!
That was GREAT !!
Thank you so much !
I'm sorry Dan, no questions... the problem is that you are actually a really great teacher so you leave no room left for doubts 👏 👏 👏
Common Sense, Thanks Daniel and Kaydence and Happy Friday 😎👍🇨🇦
Really interesting.Cheers!
But that presents a paradox: Getting the light closer will create fast falloff but also increases the light size relative to the subject and thus creates softer shadows and smoother transition from light to dark.
Daniel ('cos that's your name) have taught me a great deal, so now it is pay back time. The inverse sqr law relates two light intensities: I measured at the source and the intensity I' measured at a distance r from the source. In short I' = I/r² In order to be consistent with your example, you may not vary the power of the source.
Thank you so much Sensei! You are a blessing!
Thanks, appreciate your Stright forward, right to the point style
Thanks, Daniel! Cool dress, Kaydence.
Another excellent video. With Kaydence close to the backdrop, you could also move the light farther away, which would make the backdrop even lighter. It will increase the harshness of light on Kaydence, but a larger modifier will solve that without affecting the background.
Thank you, Daniel! Another great K.I.S.S. (Keep It Simple Silly) video.
Thanks that was actually quite useful! As a newbie photographer who's ben lately trying to grasp the concepts of light in real-time contexts on photo events, I sometimes lack the opportunities to "see" things happening in terms of experimentation as you yourself are doing here, so it does help a lot to see actual comparable results :D
Great as always. Daniel, where is the puppet version of you?
Thanks you two!!! this is always good information to know!!
Very helpful. Thanks for the info and all that you share. 👍🏻
you are very good at explaining this.
Was my first lesson at RIT.
Thank you Daniel and Kaydence. Just out of interest what make/model of monobloc are you using. It looks like an Elinchrom?
It doesn’t change your main points, but light falls off linearly (1/x) from an infinitely long line source. That’s why fluorescent tubes light so well. Light intensity is constant with distance from an infinite surface, which is one reason why we use light boxes which are not quite an infinite surface, but somewhere in between. It is point sources that follow the inverse square law. Always good to be scientifically accurate. Great video nonetheless!!
What is the sticker on your laptop? I always think it is a devil logo. Reminds me of my youth, when I rode world industry boards.
Thanks... 🤗
I like how the inverse square law provides control over different zones of light
I’m primarily a still life photographer and very often shoot with an open, fresh daylight style of lighting. So I combat the inverse square law by lighting with a bare head positioned as far away as I can. My studio has a high ceiling which helps a lot. Fall off, while a useful benefit for portraits, is a dead giveaway if you try to mimic sun light. Thanks for your videos. Hi from Sydney, Australia.
So, TTL has a hard time with inverse square law? (Taking notes!)
what are the lines on the floor youre referencing? are they specific distance markers from the wall? how many have you got? im looking to build a studio and if its something that is handy, id like to incorporate them
I was being a bit tongue in cheek, but the lines are there from the construction of the building. I believe they squares are about 4’ but not built for photo use - just happen to be there
Man thats a cool dress!
middle grey dress? with jet black hair and pale skin, very cool combo!
❤️❤️❤️
Thanks again for tall your fabolous videos. This particular one - i guess - will puzzle lots of newbies.
They might get the impression that you cannot get the dramtic light in front of a white wall. You chose to keep the light in the same spot and just move the model which resulted not only in the brightness of the wall changing but also in the the light on the model becoming increasingly harder. However, you could also have chosen to move the light along with the model - so that the light on her keeps its quality but still changes the brightness of the background.
I was wondering why the light direction (or orientation with respect to the model) didn't change as the model changed her position. Or maybe the flash was so omnidirectional after all, that it didn't make much of a difference.