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I’ve mentioned in my earlier post that exposure is the most important aspect of photography. Now let’s see the various parameters that affect this variable (Exposure).

1. Aperture.
2. Shutter speed.
3. ISO(Sensitivity of the sensor)

Depending on message that you want to convey with the photograph, you can vary of the above parameters to the desired level to achieve correct exposure.

When do I control the Shutter Speed?

To achieve this effect I need more control over the shutter speed. In this case I set my camera to Speed priority (Marked as S in the most of the cameras) and let my camera choose the desired aperture to achieve the right exposure.

When do I control the aperture?

Here the objective is to capture the beauty of the Blue tiger butterfly, so I do not need anything in the background to distract the main subject, in other words I need a shallow depth of field. I can achive this by setting my camera to aperture priority and let the camera decide the shutter speed.

But there is a catch here, I do not have a macro lens to shoot a closeup shot, so I depend on my Nikon 70-300 non VR (Vibration reduction)lens that gives me a minimum aperture setting of 5.6 at 300 mm. Since this is a non VR lens I need to solely depend on a important thumb rule to avoid camera shake spoil the sharpness of the image. The thumb rule is to make sure that the shutter speed is always be grater than the focal length of the lens.

Example: If I have to shoot at a focal length of 300mm I need to make sure that the shutter speed is grater than 300 ie,. 1/500

Since I have ample ambiance light to illuminate my subject I did not worry about the shutter speed so I let my camera chose the shutter speed.

In this sutuation if I do not have enough light then I need to depend on the ISO level. To gain more fstops of shutter speed I can increase the ISO level to achive the same with the expense of noise.