Introduction
For the purposes of this assignment, I have used Manual, an iPhone app that allows for manual controls of your cellular camera. This app was recommended by the professor.
Part 1: Bracketing
Bracketing is the process by which a photographer takes multiple photos of the same subject, each photo being set to a different exposure setting. This is typically done where one photo is set to the desired or supposed "best" setting, while the remaining photos are shot with a higher or lower exposure bias. This process highlights different aspects of the subject and provides the photographer with multiple options to choose from.
To represent a bracketing sample pack, I have posted three photos of the same statue in my apartment below, along with their settings. You'll notice the visual differences in the photos based on what exposure bias they have, and how any of the settings were changed along with said exposure.
Exposure Bias: 0
F-Stop: f/2.2; Exposure Time: 1/30 sec; ISO: 64
Exposure Bias: -1
F-Stop: f/2.2; Exposure Time: 1/30 sec; ISO: 32
Exposure Bias: +1
F-Stop: f/2.2; Exposure Time: 1/30 sec; ISO: 125
As you can see, the exposure was changed from its initial bias of 0 by one stop to the left (-1) in the second photo, and one stop to the right (+1) in the third photo. As for the ISO, the photo with a negative exposure bias saw a decrease in ISO of 50%, while the photo with a positive exposure bias saw an increase in ISO by around 95%
Part 2: ISO
Part 2A
Admittedly I'm not sure I completely understood the instructions for this part of the assignment, but I tried my best to fulfill what was asked of me. You'll notice below I've posted another three photos of a different subject, as well as each photo's settings. The purpose of this photo session (I believe) is to show the difference in image quality by messing with the shutter speed and ISO of your shot in a setting with ample lighting. So I took a basic photo at the start with settings that seemed to fit the photo perfectly on a technical level. For the second photo, I increased the shutter speed and decreased the ISO as much as possible while still trying to get a decent looking shot, and vice versa for the third photo.
This led to the second photo losing a bit of detail, as well as being a bit darker, with the third photo being a lot brighter and kind of grainy. Throughout each photo, the F-Stop remained untouched, as well as the exposure bias. The only things that changed were the Shutter Speed and the ISO, each going in different directions to try and balance each other out.
Exposure Bias: 0
F-Stop: f/2.2; Exposure Time: 1/40000 sec; ISO: 500
Exposure Bias: 0
F-Stop: f/2.2; Exposure Time: 1/9901 sec; ISO: 32
Exposure Bias: 0
F-Stop: f/2.2; Exposure Time: 1/5650 sec; ISO: 1600
For the purposes of this section of the assignment, I took it upon myself to photograph three different subjects, each in different lighting situations. The first photo was taken outside around 3:00 PM, and thus is bathed in light. To compensate, I brought the ISO down to it's lowest possible setting, and the natural lighting made the picture come across very clean and of high quality (Ignore my finger in the top right corner.) After that, I photographed a hallway below my apartment, and due to the low lighting inside it, i bumped up the ISO until it looked as though i was being abducted by aliens. For the final photo, I photographed a window in my room closer to evening and tried to have an ISO in between the other two photographs while still making for a nice photograph.
Exposure Bias: 0
F-Stop: f/2.2; Exposure Time: 1/659 sec; ISO: 32
Exposure Bias: 0
F-Stop: f/2.2; Exposure Time: 1/30 sec; ISO: 500
Exposure Bias: 0
F-Stop: f/2.2; Exposure Time: 1/15 sec; ISO: 160
It is in my humble opinion that tying to go for as low of an ISO as possible is a good idea. Technical compensation of any kind, especially on a cell phone camera is not exactly going to lead to crisp photo. But if it must be used, higher ISO settings work best in low-lit environments, though it is important not to go too high as your risk over exposing the image. Lower ISO settings work best in well-lit situations as the natural lighting will do a solid job making your subject visible. You can use slight ISO increases as need be, though do not go to crazy. You can afford to go a lot lower in well lit scenarios than you can afford to go higher. As for moderately lit situations, use the ISO as need be. You'll probably be fine with moderate ISO settings with a decent amount of wiggle room to increase or decrease depending on extenuating circumstances.
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