Learning Your Equipment – Part 3

Learning your equipment sounds really easy until getting out into the field and realize, “I never thought about how to evaluate the amount of light put out by my light source!” Now this opens up a new area for questions and learning. “How sensitive is my camera to light?” “How does my camera’s sensitivity measure against its shutter speed?” “How does my camera’s sensitivity to light change with each aperture stop?”

Some answers can be “too simple” or rather purely informational without direction as to the application of the information. So in this post I hope to bring you two options explaining their application to the best of my ability.

Option 1: Light meter. Handheld light meters get more expensive the fancier features they contain. There is an excellent article by B&H Photo on learning about handheld light meters and information to help you choose the appropriate light meter for you. Most digital cameras are equipped with light meters (if you will remember the light meter I referred to in my first post on “Learning Your Equipment”). However, there is one key difference between a handheld light meter and a light meter in your camera.

The difference in light meters held in your hand or in your camera is this, the meter’s location. Now what will help you most? A light meter showing you the amount of light surrounding your subject or the amount of light around your camera? Answer: You want to know the amount of light around your subject. That makes it a little difficult to measure the light around your subject with your camera when it is more efficient to have it set-up on your tripod.

Option 2: Requires a lot of experience and a trained eye and mind. Using your own vision to estimate the light around your subject is cheapest and builds your skill. I am still tweaking my own skill, so I am not much practical help at this time. Some practical pointers to come in Fridays post.

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Camera Troubles – Part 5

There is one more part of the human Eye and camera that we have not covered. This is the process of the Data Transfer from the Sensor to the Storage media via the Processor.

The Data Transfer:

The human capability for vision is amazing because we think we understand it enough to duplicate the process, only to realize our duplication is much less efficient than our inspiration.

As soon as our Retina receives the light of our surroundings, beginning to send the neurological impulses to the Optic Nerve there is a process of Data Transfer initiated. The amazing thing about this Data Transfer is the amount of detail that can be recalled, or amounts of certain information which one can be trained to receive and recall.

Illustration of information recall: Military branches train their personnel to acquire a target and discern in an instant if it is friendly or hostile. After an operation, begin the reports from each member and with it the lists of information that is most important; number of personnel on the operation, enemy patrols encountered, branches to which the patrols are affiliated, shots fired, number of injuries…etc. There is a lot of information to take in with precious little time to do so. This information is primarily accumulated by sight and secondarily with the other 4 human senses.

The same for public servants. Police officers require the use of sight in making reports besides assessing the threat to the public and their own safety. Paramedics make reports with vital statistics of a patient from many different senses at the same time. Firemen and women are trained to take verbal queues before getting to the scene of an emergency to take their own assessment of the situation.

This is all gathering data. These mentioned public servants and military are trained not just to gather information but to recall it for the purpose of reporting the events as they happened. This Data is what I draw upon in likening it to the Data a camera receives.

When the sequence in a camera is initiated, the light received by the Sensor is converted into Data which is transferred  across thin metal conductors. However, here is where Data loss becomes a problem. The Sensor is made up of millions of little pixels which receive light. There is not adequate space to give each pixel its own dedicated metal conductor for Data Transfer, so there ends up being about 100,000 or more pixels attached to 1 metal conductor lead.

Even still it is incredible that with so much Data being Transferred there is not more Data loss in digital cameras.

In the next and last post for the “Camera Troubles” series, we will discuss the specifics of the digital camera limitations so that we can learn to capture the detail we want.