Playing Around With Aperature
Equipment Used:
Nikkor AF 50mm f/1.8D
I guess what I'm trying to do here is to manually adjust the aperature from 1.8 all the way to 22, and see the different affects it has on depth of field, shutter speed, while keeping everything else constant, Camera (D40) Lens(50mm), lighting (House Lights), ISO (400), objects (mandarin oranges from Nathan) etc. Using this AF lens on a D40 allows the camera to adjust the shutter speed accordingly. Hopefully the lighting will all turn out identical.
Another purpose here is that I have to use full Manual mode to use the Kiron 28mm lens. That means that I have to figure out a shutter speed, an aperature, and still make sure the photograph is not overexposed or under exposed. Having an LCD to preview the picture helps, but it's still nice to be able to expose correctly without.
Here I am playin with Depth of Field
I chose F1.8 Camera chose 1/80
I chose F2.5 Camera chose 1/50
I chose F3.5 Camera chose 1/25
I chose F5.0 Camera chose 1/13
I chose F11 Camera chose 1/2.5
I chose F22 Camera chose 1.6"
Conclusion:
As we can tell, the photographs have pretty much the same lighting. It is roughly observed that if the aperature increases by 2 times, the shutter speed should increases by 4 times, and if aperature increases by 3 times, the shutter speed increases by 9 times and so on. I guess this has mathematical explanation to it. When you increase radius (decrease aperature), the area that the amount of light can go through is increased by a power of 2. So you would need to decrease the shutter speed by that power of 2 to keep the exposure the same.
Looking at the pictures, I do like the fact that the smaller aperature numbers produced a short depth of field, blurring the background. This was the type of effect I was looking for on a lens, in the future I will know the settings to use.
BACK
I guess what I'm trying to do here is to manually adjust the aperature from 1.8 all the way to 22, and see the different affects it has on depth of field, shutter speed, while keeping everything else constant, Camera (D40) Lens(50mm), lighting (House Lights), ISO (400), objects (mandarin oranges from Nathan) etc. Using this AF lens on a D40 allows the camera to adjust the shutter speed accordingly. Hopefully the lighting will all turn out identical.
Another purpose here is that I have to use full Manual mode to use the Kiron 28mm lens. That means that I have to figure out a shutter speed, an aperature, and still make sure the photograph is not overexposed or under exposed. Having an LCD to preview the picture helps, but it's still nice to be able to expose correctly without.
Conclusion:
As we can tell, the photographs have pretty much the same lighting. It is roughly observed that if the aperature increases by 2 times, the shutter speed should increases by 4 times, and if aperature increases by 3 times, the shutter speed increases by 9 times and so on. I guess this has mathematical explanation to it. When you increase radius (decrease aperature), the area that the amount of light can go through is increased by a power of 2. So you would need to decrease the shutter speed by that power of 2 to keep the exposure the same.
Looking at the pictures, I do like the fact that the smaller aperature numbers produced a short depth of field, blurring the background. This was the type of effect I was looking for on a lens, in the future I will know the settings to use.