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The Inverse Square Law Cheat Sheet – Myth Busted

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UPDATE: This Experiment is all Wrong. I should hit my head on the same wall I used to measure reflected light off. Some great comments about what went wrong, and great discussion going on – I posted the main points here.

Have you heard about the Inverse Square Law? It’s the law that says that light intensity falls the farther you move your light from your subject. It also tells you that if you move your light to be twice as far it will fall by 4 (the square of 2). if you move the light three times as far, it will fall by 9.

We all swear by that law. The only thing is this law does not apply to the way most of us use flashes.

I’m gonna explain this in a beat, but first here is my newest cheat sheet. (I love cheat sheets. If you are as senile as me, you can print them and then pop them up later and look really smart).

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Black & White Cheatsheet For Photoshop

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When it comes to black and white conversion, there is no definitive method that will get the best results every time. Some use the channel mixer conversion, while others will swear by black and white filter. Other just like the simplicity of the desaturate function. Which one is the best? It depends. This is why I was so happy when Ladislav Soukup from ladasoukup.cz (flickr) sent me this cheat sheet. Read on to find your best suited conversion in an instant.

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Light Falloff Cheat Sheet Card

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As part of my ongoing exploration of portrait photography in general and flash studio photography in particular, I wanted to examine the effect that a large light source will have on light fall off. This was a great chance for me to produce a new cheat sheet to companion the portrait lighting cheat sheet and reflector cheat sheet that are already out there. (And this time we have a special guest, read on…)

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Reflector Card Cheat Sheet

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My previous cheat sheet dealt with the impact of light position on portraiture. The idea was that you can print this cheat sheet and carry it around for fast consultation and getting fast results.

My next investigation involved a single flash again (this time shot through a shoot though umbrella) and different uses and positions for a 5 in one reflector.

Again I suggest printing the card so you have a quick look when ever you are not sure of what a certain reflector effect may be.

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Portrait Lighting Cheat Sheet Card

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Setting up lighting for a portrait can be quite a complex task. If you, like me, are using small strobes which have mo modeling light it is hard to predict what will be the outcome of each lighting array.

There are however some basic lighting schemes, kind of a starting ground for new portraits. Of course, once you lay out the initial lighting you can change it, move it around and use modifiers to soften or restrict the light.

Wouldn’t it be nice, though if you have a magic card that will show you what will be the final lighting of almost every lighting scheme? I think it can be pretty darn cool.

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