In this blog post, I would like to share some insights with you regarding the connection of aperture and inverse-square law of light as well as their effects on light fall-off. I’m going to be using Set.a.Light 3D to demo some of the things, but light behaves exactly the same in the real world. Let me ease you into this topic by explaining the aperture first.
When I started to use artificial lighting, The Inverse Square Law was my nemesis. Not only it is not intuitive, but it is also not linear, and visualizing how a strobe distance from a subject will impact the photo is not trivial to say the least.
Photographer Derrick Bias shared a few priceless photos that show the exact impact that moving a strobe away fro ma subject has.
One trivial effect, of course it the fact that less light hits the model, but light fall off, background to model illumination ratio and overall contrast also play a part in this game. While I encourage everyone to take the time to learn The Inverse Square Law, and its impact on your photos these photos will provide an instant reference point if you are just starting out.
Social media platforms seem to change their image sizes pretty much every time you login. And every time that happens, photographers everywhere have to scour the internet searching for the new sizes. You just know that facebook is going to CRASH your photo if you don’t feed it the exact right size.
Well, here’s some good news: Mainstreethost blog already did the leg work for you.
Filters are magic, and I am not talking about those buttons that punch on Instaram, I am talking real glass circles that you mount on top of a lens. The folks at zippi, came up with a fun cheat sheet that explains what each one does and when is the best time to use it. See the full stack after the jump.
Aside from the regular artistic consideration, shooting time lapses requires quite a bit of technical know how. This check list from Stefan Kohler take lots of the stress of you, as you can just cross the items as you go on…
If you are learning the ropes, or simply want something to ease your workflow, you should download this (here) print it and put it in your pocket. We break it down for you after the jump. [Read more…]
So we had a Portrait Lighting Cheat Sheet that was designed to help placing the light in space around the model. While I called it portrait lighting cheat sheet card, I was only telling half of the truth.
The half that I did not include in that card was how different modifiers will change the light falling on your subject.
It is time to correct this wrong, so this lighting modifiers cheat sheet completes this gap.
There are some new things on this sheet, like a perfectly still model, dark walls to control reflections and a few beers that you can not spot in the actual card. But they were there. Trust me.
You can download a “super size” here.
Again, we tried to keep it simple. We usually ask a wife or a boss to model for those kinda things, but since the differences between the modifiers can be subtle we wanted to keep everything constant but the light. So… We asked Lady Plastic to come to our aid on this one. She kindly agreed or at least did not mind. [Read more…]
After reviewing the Rosco Strobist gel collection, I just had to take it for an intense spin.
Since one of the main uses I see for this kit is the ability to color objects and backgrounds for creative effects, I did a little matrix of colors. (I am a computer geek, I know).
As with all the other cheat sheets on the site, I will go through the idea, the setup and end with a creative commons statement. Unlike the other cheat sheets, we are also going to have a Rosco Strobist gel collection giveaway. That stuff is near the end of the post.
Yesterday I posted a cheat sheet that tried to question the applicability of the Inverse Square Law (ISL) on the way we use portable flashes I called this post The Inverse Square Law Cheat Sheet – Myth Busted.
The post stirred up a great conversation from which I learned about Light, some physics and some in camera processing facts. But mostly I learned that it is great fun to experiment and to share your findings. It definitely helped me get my knowledge to a higher level (at the small price of throwing a way my totally wrong fringy and conventions breaking experiment.
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).
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.