Thanks to JoeSweet for hosting our previous Technique-110-sky challenge and thanks to everyone who participated in the challenge. I was not the winner of the sky challenge, but it has been several weeks and a new technique challenge hasn’t been posted. I really like the technique challenge and I don’t want it to end, so I decided to jump in and start a new one just to keep it going.
The topic I’ve chosen is ‘Photoelasticity’. You will need a polarized light source, a simi-transparent subject, and a linear or circular polarizing filter. A great polarized light source is just a computer or laptop screen. If you don’t have a circular polarizing (CPL) filter, you should get one - they’re great for darkening skies, removing reflections, and they’re not too expensive. But holding a pair of polarizing sunglasses in front of a camera works just as well.
This iPhone photo should give you an idea of how it works.
Technique 111 challenge will start on December 22nd, 2020 and will run through January 15th, 2021. Photos need to be taken and posted to the site within those dates. A list of finalists will be selected and posted shortly thereafter.
The winner will get to choose the next technique and host the next round.
Please tag your shots with:
Technique-111-Photoelasticity
interesting technique! i just tried it with an iPad which i realize may not be ideal, but it worked... kind of... for one type of plastic, but not two other types i tried... i may experiment a bit later in the week with different screens and plastic types... thanks for keeping this challenge alive!
Thank you for keeping this challenge alive and thanks for bringing this technique up. I'm not sure yet if I did understand the physics, but will give it a try.
This is fun! Also, instead of having to download a google white background, I learned from a video that the easiest way to get the white only screen is to open notepad and make it full-screen size. Worked perfectly!
@granagringa - I noticed that if the laptops screen wasn't pure white, you could see part of the screen in the colors on the object. I tried to incorporate different images and patterns on the laptop screen, but couldn't get anything I liked. Maybe someone else can pull it off.
@mona65 - I don't really understand the physics of it either. I looked for a Photoelasticity entry on simple.wikipedia.org, but they didn't have one.
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This is so cool! Definitely going to have to give it a go!
@mona65 - I don't really understand the physics of it either. I looked for a Photoelasticity entry on simple.wikipedia.org, but they didn't have one.