Exposure Triangle and Mode dials

The exposure triangle is the collaboration or "reciprocity" of the three exposure controls. Aperture, Shutter Speed and ISO. Each of these three controls have their own effect such as Aperture changes depth of field, Shutter Speed changes how movement is recorded and ISO increases the cameras sesitivity to light. All of these have one thing in common, they can change the Exposure (amount of light let into the camera.)

The "correct" exposure is an image that has the right balance of light and dark but photographers can purposefully under or over expose to add effect to an image. for example in a night photograph which is trying to show darkness, you would want to under expose by about 1 stop on the exposure meter to portray darkness because you wouldn't want the "correct" exposure as this would be too light. this happens because the camera takes a reading of the scene at an average and compares it to an average light reading.

The exposure meter is located in your cameras viewfinder for easy and quick reference.

 Mode dials are a very useful tool that comes with most cameras, especially every dslr. It is located on the top of the camera body, the mode dial accommodates a variety of different selections which are different with every camera, for example beginner dslrs have a variety of automatic selections such as sports mode and portrait or macro. These selections are not always on more professional dslrs because the photographer can create a "sports mode" by simply changing his shutter speed and macro mode by using a macro lens, it is not the camera which does the macro-ing...

 This is the mode dial on a Canon 600d (semi-pro) as you can see it has alot more automatic modes.









This is an image of the 5D mark 3 mode dial which as only one automatic mode as it is a professional body.