Digital Photography One on One: Episode 59: Inverse Square Law

[lalalaina4life]

Hey Mark, what octabox are you using in this video?

[TheYFlyer]

Excellent, excellent video. I was aware of the inverse square law however seeing your demonstrations really help clarify it. Thanks so much for doing this series and thanks to Adorama for sponsoring it.



[gfr327]

Concerning the panels shown at 6:00, why is the left side of the 1st panel darker than the right side of the last panel? The panel appears to be ~4 ft. wide, so given the image taken at 1 ft., the images taken at 8 and 16 ft. should be no brighter than the left side of the 1' image, which should be ~ 5 ft. from the light source.

[gromacs00]

This "experiment" is completely USELESS if you don't turn off the ambient lights. It doesn't look like you turned off the ambient lights. By 16ft, you are taking a photo with the lights on the ceiling instead of the softbox. This entire thing sounded like a corny infomercial TBH, you should learn how to conduct experiments properly.

[bloddynose13]

Right. area follows rules of square. If we were measuring volume we would be looking at cubed math and really make things complicated. I like it!

[stecartmel]

as clear as mudd lol...you got that right.

[catgasoline]

Excellent and useful tip to make the best of a simple light setup

[superrobotmunkyman]

man she is so pretty

[nstarbill]

Great job, Mark! Clear, concise and wonderful examples.

[Mr550d]

this is the simplest and important class i have witnessed.

[Ketandh]

hi Mark this is the best thing i came to know really great , earlier i was bit confused with this Inverse square law but u made us understand with real life examples WOW AND THANKS HATS OFF

[SirOpusculum]

Mark, I have never heard about the Inverse Square Law, this is the first video I found which dealing with it. But this video is not only just a nice side effect, to me, it seems essential to know about it since it makes all the ratio difference. Great tutorial, so perfectly explained.

[epos85]

Your going to have severe shadows on the background if you place the subject(s) to near the background, and the light far away from both. The lightsource has become smaller, therefore you get a hard light, when you need a soft light. The best tip is to have a main light (for the subject), rim light for the hair and partly separation, and a background light for the separation it self.

[global001]

@epos85 It depends on the size of the light source. If for example you use a huge Octobox as in this video & the subjects 20 feet away & close to the background the light will be soft & cause no shadows. See Marks other video Ep 64 where he demonstrates it.

[petrentz]

i agree. she is hotter with longer hair.

[jcwienerjr]

Sorry Sam but like you with longer hair...but you are still gorgeous. Good job Mark!

[zaphod1981]

Great work,Mark. I've come across your videos by chance on the Internet and I find them very... enlightening! I'm deep into maths but this is really clarifying the way you do! thanks!

[mcrawford29]

Thanks, Mark. I've been reading up on it, but seeing it in action just cleared up the entire theory!

[nokiasaya81]

Hi Mark..great tips! i learned a lot from your videos

[vertusmatjaz]

thank you God 4 Mark !!!

[vertusmatjaz]

i am already subscribed

best tv in world...

mark is the best!

[swapnilhitman]

thank you ... was very very clear..

[GianpaoloLaPaglia]

Thank you very much, very clear!!

[joytobylee]

Sam get a new haircut. Like it.

[1thusitha]

Mark could you tell me if the source of the light Sun, how does this going to be effect ?

[sebabhz]

More videos please!!!!!

[WideSeal]

sam look nicer in this hair cut than longer hair ,she is so cute

[neilalli]

I have a Nikon D3100. I can now shoot in manual mode after years of auto focus. This due mainly to your programs which is helpful and edifying. But i have a little problem that is on my Nikon D3100 that won't allow me to connect my Remote shutter release to the camera. can you shed some light?

[pepenacho65]

super usefull! thank you!

[jitu757]

Mark, this has got the be the best tutorial of all the series. Thanks so much for breaking it down with examples because it really made it easy to understand the concept. Thank you very much!!!

[extacci]

You're the best Mark! This video is really helpful. You make inverse square law very easy to understand.

[thespark24]

very very very useful vid ....thanks so much

[booshveg]

great job man

[kazeem2000]

mark i really enjoy your tutorial every time, I need your DVD that came out about lighting.How can I get it and keep up the good work.

[ejphoto]

I like Sam's short hair style!

[paulosacramento]

Awesome! Thanks, Mark! :D

[3guys1girlandfetus]

hey mark im a filmmaker does the inverse square law works the same way with continuous light when lighting a scene?

[popaddict]

Man, I always learn so much from the videos on this channel! Thanks for these videos. Really appreciate the clear explanations :)

[damirsmigi]

I like Sam she is so cute :), nice model

[WarrenAckary180]

Mark.. this is unreal.. Ive learnt more in 3 episodes than in 4 weeks of photography Class!

Brilliant

[KeijinShiho]

You really know your stuff! Good job! Theres a douche on youtube named Dom Bower and he really is a douche who can't take criticism and cant sufficiently back up his statements. He actually critiques other photographers work, which I think is the worst thing in the world because someone who doesnt know photography shouldnt be allowed to judge others. He is sham. Snapfactory on the other hand is the best! :D

[usantacruz]

Thank you... this is really good. and helpful... as well as applicable.

[kazeem2000]

Mark where can i get your new DVD on lighting i saw the clip on you tube i need to get it, I really enjoy your show on you tube good job.

[snapfactory]

@kazeem2000 studiolightingessentials (.) com

[comberdale]

isn't there a second light in the example at the ceiling?

i see there a shadow from the wrong direction

[comberdale]

isn't there a second light in the example at the ceiling?

i see there a shadow from the wrong direction

[Solarfactor]

Fantastic video. 

[marloon88]

Well done!!!! :)

[salsero206]

love ur work!!

thanks =D

[uldistube]

Ideal episode! Thanks, Mark!!!

[oscarcll]

Imagine a sphere of radius 1 foot around the light source, and compare that to a bigger sphere of radius 2 feet. The surface area of the bigger sphere is not twice, but four times the smaller sphere (because the area is proportional to the square of the radius). So each unit area in the bigger sphere is absorbing only 1/4 of light as that in the smaller sphere. Hence the inverse square law.

[leoali83]

Mark you're genius. thank you for all the videos!!!

Sam is so pretty <3

[EVAn182]

Sam you are great !!

[JACOBthePHOTOGRAPHER]

Great info thanks!

[DGK1150]

Very well explained. Thanks.



[teamblankCM]

Anyone else think Mark sounds abit like Owen Wilson?

[ashwin0pp]

Hey Mark!!,,Tell me how to subscribe??

[ashwin0pp]

Hey Mark!!..Tell me How to Subscribe??

[TheOats]

Best photo related videos on youtube!

[imaginemylove22]

I think Sam looks better with longer hair!

[PLANEINPARIS]

good job, really well done.

[in2food]

Epiphany time!!!!

[pedrojesusfreakaoid]

I hope you cenverted to Nikon, Mark! ;)

[GreasyPsycho]

@pedrojesusfreakaoid nope. He shoots both, heck, if I could do the same, I would! :P

[Morningsidenursery]

Great stuff! Thank you!

[saradantasmelo]

Muito bom. Obrigada

[garitd]

What a gorgeous model. Breathtakingly beautiful. 

[vanhellcng]

ur the man, mark, very informative, can`t wait for the vid.

thanks.

[Stryk3r1000]

Probably the best video you have made to date. Excellent explanation. Very useful information

[tomekmisiewicz]

great clip and explanation, sam mary me :)

[padlockd]

Thank you Mark! I don't even have a flash yet, but I do have a reflector (got it after seeing your vid on that) and I can't wait to try this out!

[tabber05]

Great demo.

Thanks

[Claggy]

Great video... I'd never heard of this. Now I know. :) Also, Sam got a haircut! It looks great! I'm surprised no one else has said anything about it yet, haha.

[Dimacheari]

awesome video, once again!

[hugdeez]

Best explanation I've seen so far.

[edvasquez354]

Samantha is very pretty!

[diamened]

Great explanation and demonstration. And I'm in love with Sam

[johnxmzzhang]

Amazing thank you

[Sinwori]

please continue the great work.

most photographers would charge money for videos like this.

[akai1sora]

Very helpful.

[babyharryable]

VERY INTERESTING THAN YOU MARK

[Wandy1D]

Only you could explain this in such clear way! Great job M.W. :)

[MrMikeCanon]

Mark you rock!

[weboo15]

and you can see that there is a difference 11:19 ---just messin around!!!! great job mark!

[fcoizq]

WOW! Mark you are the best!!! tou explain this so well... keep up the great work man!!!

[Speshalyst]

most of the models are called Sam :)

[jlive555]

@Speshalyst i think thats the other Sam...she just cut her hair short~

[hibbledor]

@Speshalyst Mark collects Sams.

[supervf1]

Very interesting Mark, it's good to know how it actually works

[ny1fanta]

been waiting for a week for you to upload this episode, you should do one on one twice a week =]

[yowu7446]

awesome!!!

[Michi23]

As brilliant as always! thx

[fetor41]

Learning has occurred. Great video!

[MrMatz45]

Great video.. I had never heard about this before.. Thanks!

[rosn73]

nothing to say ... only GREAT

[kamalmerai]

That's the simplest i've seen it put.. thanks Markorama!

[DVL1507]

wow you are really good at explaining mark

well done :D

keep up the good work

[youmantube2009]

Great stuff! I really learn a lot! Thanks Mark!!!

[thoimonoko]

good concept!

[pjos111]

When you took the first photo a flash fired, does this not make a difference?

Paul

[Mozo901]

@pjos111 Well he is talking about using a flash in general...the inverse square law is more practically used with a flash, he was just using a constant light source to better get his point across...

[pjos111]

@Mozo901 Thanks for answering. :)

[Madhack2004]

Awesome as usual. Thanks Mark!!

[saperboy]

This is the most simple and clearest explanation of Inverse Square Law. Thanks Mark.

[jan4iks]

This one was very interesting. Thanks for the great explanation, Mark!

[Mosgaard]

First, and great show :)