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.

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Camera Troubles

I am frequently asked about how to adjust camera settings to reduce motion blur for photos. In each case I try to learn one thing; “How much light enters the camera lens?”

Let me see if I can bring technical specifics down to a lower altitude for us to work on without the fear of nose bleeds.

Taking photos is not all so different from looking at those beautiful scenes we are so blessed to wander through, savoring the grace and delicacy of the garden. However, I would not deceive you, there are some very specific differences between our Eye, Optic Nerves and Brains as compared to camera lenses, censors and processors.

Let me start this post set with a discussion on the make-up and structure of our vision.

Our Eye takes in a lot of information, filtering it through a complex network of cones, rods, blood vessel and finally to an Optic Nerve situated at the back of the Eyeball. This only begins the wondrous process we call “sight”.

As the Optic Nerve receives the information from the Eye, it begins informing the Brain through neurological pulses. The brain then both processes and stores the information.

So, to simplify that chain process down to a basic form is this: Eye to Optical nerve to Brain.

Now, please stay with me, we will be looking at some details within the eye that will later be applicable to cameras.

The Eye is very complex and since I am not an Optometrist I will not pretend to know every detail. The basics we will benefit in knowing are these:

• The Eye Lid, protects from injury, cleans the Eye of debris and is a front line defense to direct sunlight.
• The lens of the Eye is called the “Cornea”. It slightly changes shape, with the aid of muscles behind the Eye Lid, to form the properly curved angle for the purpose of focusing on objects near or far.
• Underneath the Cornea are the Pupil and Iris. It is very easy to start talking about both the human Eye and cameras right now, but I choose to remain on optic…I mean, topic. The Iris is the colored “ring” and the part of the Eye from which we discern the “Eye color”. It contains at-least one muscle which constricts the inner opening of the Eye (the Pupil) when you step out-of-doors and into the sun. The muscle or muscles will also relax and the Iris opens allowing the Eye to receive more light.
• I just made a statement about the Eye receiving more light, which in a manner of speaking is true. However, there is a part of the Eye called the “Retina” which is the specific receptacle of light. The Retina is very sensitive to light and will easily burn if not protected by the Eye Lid and Iris.
• The Optic Nerve is next in process from the Retina, sending the neurological pulses received from the Retina to the Brain.
• The Brain receives the neurological pulses from the Optic Nerve and catalogs those pulses in its own magnificent way.

This article is already pretty long, so I will bring it to a close and bring you “Part 2” on Friday. Before we close though I would like to bring out one last thought.

When you step into a dark area from a well-lit place, it takes your eyes a measure of time to adjust. For some people their eyes adjust faster than others while others employ methods which seem to speed the process along. One way I have heard effective is closing the Eye Lid during the transition.

Have you noticed in a low light situation, quick or faster motions do not seem as smooth or  connected? At the very least in low light situations quick or faster motions are more easily concealed.

I hope this Friday to make the mystery of the “pesky camera” plain.

Stay focused.