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Long Exposure Calculator

Photography is my hobby and passion. Recently, I've begun experimenting with long exposure photography. The cover photo of this project is from my friend Josh Haftel who is incredibly skilled at this photographic technique.

I've been wanting to build an iOS app for some time now and I'd like to combine my love of photography with my desire to build an app by creating a long exposure calculator to help other photoghers know what settings to use to accomplish the look they want to achieve.

I won't be the first person to develop this type of app, but that's not the point is it? :-)

Josh was kind enough to give his photo to me and it serves as inspiration for me as a photographer, as I am inspired by his work and strive to be as good as he is. It also serves as a reminder that if you stick to something and put in the practice, you can achieve anything.

Here are some examples of the types of images that photographers create using long exposures. Most cameras do not have an automatic setting to leave the shutter open longer than a few seconds and these types of images require exposures that last 10 to 30 seconds or longer.

// After a long absence, I'm back at it!

Here's the formula on how to calculate the correct exposure setting to get the look in the photo above.

tn = t * 2^n

Variables defined:

tn = New shutter speed

t = base shutter speed if you were not going for a long exposure (values would be 1/250, 1/200, 1/160, etc for example)

n = the value of the neutral density filter in front of your camera (values would be 1 to 10 for example)

It's really quite simple. :-)

The trick for me is grasping how to set the variables, storing values into them and then creating a timer that is the duration of the "tn" variable.

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