You have probably heard of digital noise and maybe you have an idea of \u200b\u200bwhat it is but maybe not so and therefore we dedicate a few lines.
We start from the film, remember that on the packaging of rolls of film there was a number? For example, Kodak 100, Kodak 200, Kodak 400 and so on? That number represented the ASA, the unit said that the photographer was as sensitive to light that particular film. That issue was crucial because once the film got everything needed to use it or rewind it early if you had to replace it with a different one. What is important to know is that the greater number and that the greater the sensitivity of the film to light, however, while the picture quality decreased with increasing number of ASA. In what sense?
If you take a 100 ASA film and were doing a photo notavate not anything in print, if you take a hand at 800 ASA you could see in print a disturbance, a grain that made the photo "dusty", this was due to the fact that the salts of the film with ASA were very large and high returns that also feature in press.
Here is a photo example
Today the ASA have been replaced by ISO and films from the sensors but not the basic concept change, the higher the sensitivity you bring your sensor will see more and more grain in the picture and this grain is commonly called digital noise. This noise, this noise is due to the fact that as they haul the light that hits the sensor goes to the individual pixels that compose it have increasing difficulty in recognizing the details and then start to knead in an attempt to reconstruct the image been framed.
Each camera behaves differently with the noise and the larger the sensor and it will be less obvious is that the worst results in low light and high ISO will have with the compact and better with the SLR.
I personally think all this criticism of the noise a bit useless, they coexisted peacefully with the grain when the film was and I do not see why today we have to make so many problems, not to mention that if you print your photos and much of that noise that you see on the screen disappears because the press has much lower resolutions and then covers the defects of this type.
My advice is do not go over ISO 400 on the compact if the image quality is the key for you and try to stay under the 1600 ISO with the other.
How I've said many times the photo is a matter of light, either without or using the flash, or forget it because they feel then to be so many problems for the photos to your PC and be dissatisfied is just a waste of time.
Today there are machines that reach ISO 12,000 ... crazy nonsense dictated by marketing and the need to create homes of the myths that encourage customers to change camera looking for that perfect ... that does not exist!
Give me a straight, if you go into a photo shop and the clerk starts to turn around and exit numbers list, you only found the jurisdiction of which aims to turn your money and not to your satisfaction, we remember with Polaroid are people who were masterpieces, so try to work on yourself first because the limits of the body often you will never get there!
One suggestion, the digital noise can be an excellent weapon to your advantage if you like taking pictures in black and white, in this kind of picture it does not bother the grain and in fact becomes an element that gives importance to the next step . If you were there and then come across pictures particularly botched and full of grain and the result you'd like to try to convert it to black and white before you trash, you will see that often obtained the photos convey something.
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