A few months ago if someone had told me about Sigma without reference to superior optics that are a viable alternative to the original, I would have asked: “are you talking about those very slow boxes ?”.
And basically I was right but I did not know what I was saying, I went to intuition as would anyone else who works / plays / relaxing with a camera in 2016.
Then I found a conversation recommended by a “tempter” friend in well-known italian forum (juzaphoto) about these mystical quality of the sensor, to capture the light, in representing what is before us and in a different, unique and clear way.
The weeks passed and I began to search over the whole web what to buy and where to find a seller willing to sell the chosen model: the dp2m .. m as Merrill.
Found the right one at the right price, (lucky shot seeing prices rising around the world, in Petzval style or like as Contax g lens after the impact of the mirrorless) I started to evaluate it step by step.
We are all equipped with cameras, all, and through mobile phones, mp3 players, laptops, tv etc etc, we all have a way of making a picture, good or bad it is, but unlike what happened years ago, we take digital pictures only.
Once upon a time there was the film and in fact, the same film captured the image exposed without any complications in the moment of the shot, opening the shutter enough to impress it with the light.
Today, all (or almost all) the digital photographic devices that we use are equipped with sensors that to read colors require matrices (Bayer-Xtrans) that are interposed between the light and the sensor alone.
The sensor is a receptor of light and nothing else, and can’t read the color of the light that arrives but only the intensity.
Subsequently, to compose the final digital image, we will need to rebuild the final image with the demosaicing process.
For Foevon sensors, does not exist matrix between the light and the sensor, it solves the problem by overlapping three different color “sensors” at same resolution (in the case of Merrill) and by filtering light between the first and third layer depending on the frequency of the same .
As can be seen from the above image that it is was taken the physical film regretted by many, and has been adapted at the time of miniaturized electronics; But, what happens to the image?
What happens to the raw photo department?
The previous image summarizes better than a thousand words the difference between the two approaches.
The first has a same plane is divided into 3 colors 50% green, 25% blue and 25% red that create the mesh, but in fact lowers the actual resolution captured; the other approach has the complete resolution exposed to the colors.
What will be the conclusion, apart from the fact of having always a greater clarity with Foveon?
Which will serve more light to pass 3 layers, which serve more energy and computing power to bring together “three in one sensors” into a single image, there is a reason why this actually winning technology, has never won in the market .
I will try to answer these questions in the coming days with examples and tests.