Megapixels or inches ?
GOOD CHOICE !
Personally, I’m so comfortable with the Panasonic DMC-T27 that I see now reason to try the camera Nikon D300S . Really not confident that there will be much difference in the final image. But you will have handle on that soon. Thanks for taking on the trial.
And to be honest, I can’t imagine buying a digital camera without an articulating screen. Frankly, I can’t see any valid reason for a digital not to have one.Most necessarily reading here my digital problems
The market of a digital cameras grows every week, the range of any large store can have hundreds of titles. And almost about each model in advertising seductive epithets are written. Thus the number of characteristics and functions of the device makes some tens.
How to not get confused in in a diversity of models and to buy what will approach you? Which of the characteristics listed in the specifications are important and that they influence? Briefly, without going into theory, we try to answer these questions.
In very general terms, a digital camera consists of a photosensitive matrix lens, electronics and other equipment, which includes, LCD screen, the view-finder, flash, etc. The lens creates image. Matrix converts it into an electrical signal.
Electronic processes the signal moving into the available computer or printer type and write to the memory card (and showing on the screen), as well as manage the whole process, connecting all parts of the digital camera as a whole.
The first part we look at the least known and discussed the characteristics of digital cameras, namely related to the matrix.
Matrix of the digital camera. Megapixels or inches?
The first, and often the only thing that can tell the seller about any matrix digital camera is how it megapixels. But there is another, much more important parameter is the geometric size of the matrix. That simply its length and width in millimetres. The most common in digital cameras following dimensions matrix:
Actual mm.
The name Kf (in the number of times the diagonal less diagonally frame conventional film)
3,4*4,5 1/3,2″ 7,6
4,0*5,4 1/2,7″ 6,4
4,3*5,8 1/2,5″ 6,0
5,3*7,2 1/1,8″ 4,9
6,6*8,8 2/3″ 4,0
15*23 APS-C 1,6
The specifications do not show a millimetres only confusing reverse in the number of inches. Why it is so? Because it is the tradition. But even this number could not be found, it hold back.
The aid comes word. Find in the specification (or lens frames) focal length (more about it in the next part), and an equivalent focal length (or 35mm-equivalent), and simply divide the second to the first.
For example, if a written F = 7-21mm, Feq (35mm.eq) = 35-105mm, you need to take either 105/21 or 35/7, both get the same number of 5. Find early in the third column of the table (Kf), and sought the matrix in the digital camera 1 / 1.8″.
On what this size is influences, why it is so important?
First, it affects the size and weight of a digital camera. Aside from the dimensions of the screen and batteries, the dimensions (linear dimensions), the actual optical part of the digital camera (matrix + unit), all other things being equal, linearly dependent on the size of the matrix, therefore, the volume and weight – cubed.
That optics digital camera with Kf = 6 can be done in 3.4 times lighter and shorter in length, the digital camera with Kf = 4, and 52 (!) times easier APS-C than (in this format APS-C delautzifrove mirror sets entry-level). These figures are true to the same characteristics of the lens and light, they will be discussed in the second part of the article).
Secondly, it affects the noises (color unpleasant divorce in the picture especially when shooting at dusk and indoors), than smaller the matrix, than better. For details, it is slightly below. Besides suffering taste flowers, they are “hot” on large matrix.
Thirdly, the size of the matrix affect the depth of field (depth sharp image space). When you pick a certain object, the lens “focus” (usually automatically) it, but the sharp produced not only an object but some areas before and after him. Dimensions (depth) of this area depends on many parameters on complex formulas, but for us it is important that, other things being equal, there has been a significant increase with a decrease in the matrix.
That digital camera with a small matrix depth of field will be of long indefinitely, or virtually all objects in the frame to be sharp, and the main one of them remains.
In addition, at the expense of field personnel (especially portrait) seem to be flat. Note that the reverse problem (to get more depth of field at high matrix) is fairly easy, although the loss of advantages noises described in the preceding paragraph.
And fourthly, the greater matrix, the higher the price.
We clearly say that it is better, no matter how large or small matrix. The small matrix low price and small size, and handhelds, as well as a lower quality (noise and color), and the impossibility of a small depth of field. Last for the majority of users is a disadvantage:
if the main purpose of the photos in the style of “I am against the backdrop of Eiffel Tower”, great depth of field only to the benefit. The most important is for the buyer.
And what about the megapixels? How many you want? At this stage answer is simple – it does not matter. How would producers do not advertised new high resolution, for general photography and conventional formats such as 15 * 20sm quite enough 4Mp (for 20 * 30sm-6).
The eye is almost impossible to distinguish between the printed image with 4-and 7-megapixels cameras provided that they have the same geometrical of the matrix and not many (not more than two years) is the date of issuance. 8Mp camera shoot better 4Mp not because megapixels, but because of the fact that the first constructed in a grid size of 2 / 3, while the second-~ 1 / 3 “.
Thus, if two modern chamber with the same amount of geometric matrix (for example, 1 / 1 .8 “) is only megapixels (say, 5mp and 7mp), and lenses and other parameters approximately equal to the purchase that cheaper because withdraw they will be roughly the same way. By the same token, and the more fles-carthu images fit.
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