There is a wide variety of digital cameras on the international market and almost every month there are new releases. Olympus is a well known producer and a well imposed brand on the market. In January 2007 Olympus released a new model, the SP-55OUZ, which seems to be the prodigy of this line, being a lot more performing than the previous model, the SP-51OUZ. The main characteristics of this camera are the image stabilization, 7MP resolution, and the 18x optical zoom range. The oom market became quite competitive and the model in discussion competes with other high quality models, such as Sony H5 or Panasonic FZ8.
This new Olympus camera is supported with Olympus Master software and AA batteries, has internal memory and xD picture card slot, over 20 scene modes, 25 language options, RAW and exposure modes, super macro mode, and 7.1 Megapixels. The SP-55OUZ model is not a small camera so some may not prefer it because of this, but taking into consideration its qualities, the size is not at all an inconvenient.
Another great digital camera is the new FinePix S5700 from Fujifilm. This model is the optimized version of the FinePix S5600 model, which was voted last year as the European Zoom camera f the 2006 by the most important European association of electronics consumers. The new model is compact and lightweight, has 10x optical zoom lens, Fujifilm Intelligent Flash system, having several scene selections. Its menu system is highly improved and it is ideal to carry with you anywhere, since it can be easily operated with one hand.
The most significant changes FinePix S5700 has over its predecessor are the ergonomic design, reduced proportions, improved ISO sensitivity up to 1600, new flash modes and a 7.1 Megapixel CCD sensor.
Sony Cyber-shot DSC-g1 is another great digital camera recently released on the electronics market. The G1 model, in particular, is Sony’s first wireless digital camera, which has 2.0GB of internal memory, 6 megapixel and a 3.5 inch LCD with a 921,000 pixels resolution screen. This model has the ability of sending photos wireless to other digital enabled devices such as laptops, palms, PCs or cameras. Reviewers say that Sony G1 model is the perfect take away digital camera, since its internal memory is pretty generous. This way, during vacations for example, you don’t have to change extra media cards in order to store more photos; 2GB of internal memory can host photos taken during a medium vacation.
Still, if you think Sony G1 internal memory is not enough and some additional storage is needed, there are Memory sticks available in capacities up to almost 9GB. This new Sony model has also an attractive design, its 3x optical zoom lenses being wrapped in a shinny metal body. The price for such a model may vary between $600 and $800, and additional accessories can also be purchased. These digital cameras represent the beginning of the new electronics era.
Craig Rad
http://www.articlesbase.com/electronics-articles/digital-cameras-from-the-new-electronic-era-126791.html
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Why are large telescopes used together with digital cameras or other electronic instruments?
And why do astronomers seldom look through such telescopes directly?
The human eyeball is a very imperfect observing instrument. Modern CCD cameras can record far fainter objects in more detail, and spectroscopes and photometers can obtain numeric data which is far easier to standardize and analyze.
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Very large telescopes are not very useful to use visually. The main reason is that in order to take advantage of all that light gathering power in such a large telescope, you need a lot of magnification, and Earth’s atmosphere makes using large magnifications pretty much useless. Using a more normal magnification on such large scopes wastes a lot of light and it will do little good.
A camera sensor or film plate doesn’t have this problem, because light doesn’t need to be returned to a collimated form for the camera to use it (like our eyes require). Additionally, cameras can take long exposures, gathering far more light than a human eye can, therefore allowing us to capture very faint light out there. Generally speaking, the human eye is not a very useful instrument for detecting things deep in space… at least not until a camera images it and presents the image to us.
Because of this, there is little benefit to direct observation when it comes to professional astronomical work. Therefore professional astronomers don’t really spend time looking through telescopes as part of their job. Visual astronomy is really only good for the asthetic value of seeing some of the great wonders of the sky with one’s own eyes.
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A camera can take long exposures which shows more detail, this is the main reason. A camera can also be made to see in wavelengths that the eye can’t see.
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Because they can collect and process more data using the pictures and electronics than they can by looking through the telescope. It is fun to look through a telescope and see things directly, but much more useful to take pictures, gather data, etc.
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The game is entirely about collecting photons. Distant objects in space are very very dim, because light from those objects has scattered as it travels the vast distance. The larger the apeture the more photons you can collect, but the density of photons is still very thin, too thin for you to see color, too thin for you to see the finer details; by using a camera you can collect photons over a large period of time, perhaps minutes, often hours, and sometimes over many months; all of which can be assembled into a single photo of remarkable detail.
It is fun to peak through a telescope and just take in the view. However, large telescopes are too expensive to use in idle pursuits, so their hours are used to maximum advantage - and, that means with electronic eyepieces and instrumentation.
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