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budgetary obektivov-zoom with bright 1.7 does not exist. Most likely, it will be a lens with fixed focal length (fix), which is not very convenient to use. Most of the budget staff of lenses from Nikon, Canon and Olympus are the best value of intensity 3.5 (on a short focal length). But, as an option, you can work with a relatively inexpensive this fix with a high aperture, the more so that his image quality should be high compared to the price-zoom lens.
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I forgot to write about a SLR camera Olympus - many of them like the price /quality ratio. These are the cheapest SLRs - a set with 14-45 lens will cost about 16 thousand rubles. But there are significant shortcomings in these models. If you decide to develop their passion for photography, you will find that a very small set of Olympus lenses and they are quite expensive. Photographers tend to choose not just the camera, and the system, ie "Body" + opportunity to buy interchangeable lenses. Personally, I liked the version of the system from Nikon, but many prefer Canon. There is no absolute leader - for some items are much Leads Canon - it concerns flagship cameras. Ie professional equipment with the matrix, whose size is equal to the size of the frame of the classical film 35 mm.
You've got to zone for beginners, what is Crop-factor. Crop - a figure which shows the ratio of the physical size of the matrix digital camera to the frame size of 35 mm film classic. Crop irrelevant to the resolution matrix. Previously, most SLR were called "Kropnutye. In Nikon Crop factor is equal to 1,5 and 1,6 have Sanon. The lower the figure, the greater the actual physical size of the matrix. U SLR "Olympus Crop factor=2, ie have very little matrix among SLR. Crop factor is the size of the diagonal rather than square. U compact digital cameras, the size of the matrix quite tiny, Crop factor varies from 4.4 (this is the best) to 7 (this is terrible).
Now the fashion to flagship matrix Crop factor = 1. But that is the lot of professionals and professional enthusiasts. My friend, the photographer now buys most popular full-length camera Canon 5d mark II with a resolution martitsy 21 MPs. Its price for the "body" in Moscow about 80/85 thousand rubles. My friend for the sake of this camera is even ready to change the system and buy Canon lenses in place of its existing Nikon. Why? The fact that a similar camera from Nikon is now worth many times more expensive!
What gives the full-size matrix?
1) Ability to use the camera lenses from the old film "SLR" without regard Crop factor. The fact is that kropnutyh matrices must preschityvat focal length. For example, a lens with a physical focal length of 50 mm. gives the camera Nikon (Crop Factor 1.5) the same effect as the 75 mm lens on the classic film cameras. A lens Olympus physical focal length of 14 mm. gives the camera Olympus (Crop factor 2) the same effect as a 28 mm lens on the classic film camera.
2) The larger the matrix, the more pixels it can be arranged, and the greater will be their physical size. This will give higher sensitivity and lower noise level. This is really important!