Terms – Exposure 2

So what is the difference in exposure between photography fields? The answer may be more fascinating than you realize.

Without an in-depth knowledge of a science it seems basic and small. Thus it would seem incapable of containing enough product for very many markets. However they more the science is studied and further discoveries are taken the science’s markets begin exploding with possibilities. Within each market is a specialized way of dealing with the product for that market. Allow me to explain:

A coin to the founder is equal to his time, resources and product used in minting it. To a collector (still in the market of the numismatist) this coin no longer holds only the value of the coin upon its date of minting, but now any more historical and geographical significance, making its value increase (besides the rising value of precious metals).

To photograph such an item as marketed to a collector, he will be interested in seeing the coin’s condition, its inscriptions, distinguishing marks and a clear representation of the metal color. This suggests to the photographer a specific method of lighting, absence of artistic embellishment and being close up for the best view of the coin’s condition. Can we safely say this requires skill and vocational specialization? Yes, without a doubt.

Take the same coin but in a different market. This coin is not being photographed to a market focus on collectors but sold to a precious metals store who pays out cash to the seller. Photography in this market (if used) would most probably focus on damage detail, over-all likeness and any metallic tarnishing. While these shots are close enough in description, the execution and lighting set-up of the shots are quite different.

While the subject is lit just as well in both shots, the lighting is different because of the market’s push for equal, over or under exposure of the background in reference to the subject. The details of how this is accomplished is still a new topic of discussion.

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.