Hello LLC members,
In three previous posts I covered Aperture (f-stop) , Shutter Speed (Time Value) and ISO (film/digital sensor sensitivity) these are the key settings to obtaining a proper Exposure Value.
But wait, these are also the key settings to creative photography as well. Once you get a handle on the trade-offs when using these settings in combination the creative possibilities are endless.
The simplest way to show this relationship of Aperture, Shutter Speed & ISO is the Exposure Tri-angle
Your ISO is set to 100, Shutter Speed is 1/30 & Aperture is at f/1.8 Your Exposure meter indicates a value of +1
Which is Over Exposed!
So what do you adjust to obtain a proper exposure value of 0 ?
Ah, here is where your creative side steps in, if you want shallow depth like this
you would keep the f/1.8 setting and adjust your shutter speed to?
Yes, that’s it you would raise the shutter speed to about 1/60 ( faster shutter speed = less light is hitting the Digital Sensor ) which should provide a proper exposure.
Ok, is this starting to make sense yet?
Same scene same light ISO 100 , shutter speed 1/30 but instead you want more Depth of Field (Larger f/# = less light entering the lens ) so you set the Aperture to f/4 effectivly cutting the light by 1-Stop and bringing the exposure to 0
The best way to learn is to put your camera in Manual Mode and play with the settings.
Here is a suggestion:
Put your camera on a tripod in Manual Mode, take some object(s) from around the house put them in different lighting conditions (bright,dim,& dark) and shoot some photos, adjusting only shutter speed, then adjusting only Aperture, then only adjusting ISO so your light meter shows a perfect exposure value ( 0 )
There is one catch:
If the scene is Extremely Under or Over Exposed you may have to adjust two of the three settings to achieve a proper Exposure Value.
I also can suggest a great book by Bryan Peterson ” Understanding Exposure “ which I know for a fact is at the Palm Beach County Library because I have checked it out multiple times myself 🙂
Check out my photography site dapontephotography
P.S. Please feel free to leave comments or questions