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SLR cameras are much appreciated by military photographers because of their exposure resolution, sensitivity and versatility in the field, the availability of a wide range of lenses and because they allow an accurate image preview section of the closure of the moment. Many photographers prefer for digital SLR sensors larger than most compact digital cameras, now with image sensors of the same size as conventional film formats. These sensors enable such largeField of-view film formats as well as their sensitivity values comparable.

Over 80% of digital SLR cameras sold today are Nikon and Canon models. As a result of their dominant position, have a plethora of lenses and accessories for these two camera bodies, what an excellent choice and great prices. These include: lenses, which are fast, light, optical image stabilization, autofocus and a night vision camera modules and otherAccessories that enhance the overall performance of the camera. Note that there are other camera manufacturers offer good products worthy of consideration for some applications, only Nikon and Canon cameras mentioned in this article.

Pixel: How many? How big?

The most obvious change in the evolution of digital SLR cameras have pixels, the steady increase in the number of make-up, the image sensor. Commercial cameras have seen the number of pixelsthe camera sensor to grow twenty times as many years, 1MP (1 million pixels) in 1990 to about 20MP in 2010.

There are cameras with larger sensor array better? Not necessarily. Depends on demand. There is more to understand the effects of array dimensions as large as only the number of pixels. There are two other important issues in this case: the physical size of the array of sensor and the physical size of the pixels.

Impact of the physical size of the array

L 'DSLR first time, the image sensors) were significantly smaller than the traditional 35 mm film formats (36mmx24mm. As shown in Figure 2, digital imaging sensors are now available in several different sizes. The image sensors smaller are about 2 / 3 the size of 35mm. They are both Canon and Nikon (known as the DX format) (referred to in APS-C) are available. Canon also offers cameras with a slightly larger sensor, APS-H , which is about 28×19mm it is. TheMost sensors (known as "full-frame") are now available from both Canon and Nikon and have the same size as the original film SLR sensor, 36mmx24mm.

For cameras with an image sensor that is smaller than full-frame, a digital crop factor was defined (also known as focal length or magnification) to (43.3 mm can be calculated) the relationship between the size of 35mm on the diagonal of thecamera image sensor size. How should the focal length of term, multiply the focal length of the crop factor is, of course, the effective focal length of a lens that would produce the same field of view when used with a full frame camera. For the military photographer, the concept is seen with a crop factor of> 1 is usually an advantage. For viewing at a distance, a closer look is welcome and the crop factor gives photographers a boost infocal length, so that they frame more easily when the subject is far from filled. For example, the focal length multiplier for a Nikon DX format 1.5. With a 200mm lens on a Nikon DX format the same field ofview provide a 300mm on a full frame camera. But while there are benefits to viewing distance, the narrowing of the field of view is sometimes a disadvantage for photographers, when a wide field of view is desired. For example, a 24mm lens on a Nikon DX formatThe camera is in the same field of view as a 36 mm lens may be too narrow for the application required the use of expensive ultra wide-angle objectives, to deliver the desired field of view (16mm in this example). Of course, the cameras' image sensors, full-frame, the same size as 35 mm in size, not crop factor (crop factor is 1).

Effects of physical pixel size

To better understand the effects of pixel size, compare the performance of two cameras, which havethe same physical size but different numbers of array of pixels (pixels and sizes accordingly). For this example we want to compare the Nikon D3X (image sensor with 24MP full-screen) and Nikon D3S (full-frame image sensor with 12 megapixels). The D3X is the physical size of the pixels of about 6 microns and the pixels D3S, which are about 8.5 microns, about 40% larger. In this example, if the photographer military monitors at a distance, are the identification of objectsrelated to the number of pixels of destination. Thus, if the goal is the same one used on the two cameras are compared, the distance for the model with high resolution over the lower resolution camera. otherwise explained, to provide for the lower resolution camera on the same resolution, higher resolution camera with a 300mm lens, would be the lower resolution camera or a lens is 420 mm or the photographer would have to approach the target byabout 25% of the route.

As far as the resolution goes, smaller pixels are better and the advantage goes to the high-resolution camera, the lenses that are lightweight, easy to hold and, in essence, "faster" to use. Sorry, there are even smaller pixels is not always the best thing for a surveillance camera! All things being equal, because the pixels are smaller in size, but are also much less effective in the detection of light, resulting in less sensitivity of the camera. Pixelssensitivity associated with the area of the pixel is to be so in our comparison of pixels that are the provision of 40% larger, probably twice the sensitivity (1.4×1.4 ~ 2). This means that the sensitivity of the light itself requires further liberalization or shutter speed will double. Alternatively, have the camera's processor, the signal gain. (More details in the next section). Nikon apparently no one knows that for some photographers, more resolution is not always better. The addition of pixels means that theysmaller and smaller the pixels the lower the sensitivity to light. Fortunately, the techniques of noise reduction has improved considerably in recent years, which increases the resolution, while the sensitivity approximately constant. So what if the current strategies used to reduce noise to an existing sensor without adding more pixels? This is certainly not what the design of the Nikon D3S determined, the 12.1MP resolution allowed them to increase the sensitivityCustomers who need them. For photographers who really need higher resolution, 24.5MP, Nikon D3X.

Low Light Photography

For the military photographer, some of the most difficult situations occur at night, when some 'ambient light, or scenes from a distance. Today's digital SLR cameras have unique features and accessories available to help photographers make the most of the night-imaging.

Aperture and shutter speed

L 'primary factors that affect the images in low light conditions is still essential for photography – aperture and shutter speed. For photography at night, because the depth is usually an important factor, it makes sense, an objective which has a maximum aperture range. The choice of a target for a particular application can be as important as the choice of DSLR camera. It is possible that the Nikon or Canon body due to specific objectivesThat are available. Similarly, the exposure time for night shots should be as long as possible, but still to avoid blurring the observation set of moving objects or camera shake.

Enhanced ISO – More gain with handicaps

Aperture and shutter speed directly influence the amount of light falling on each pixel of the image sensor and touching the sensor output electrical signal. In addition, digital SLR cameras allow the photographer to adjust the gain (ie gain)the sensor output electrical signal. (This is very different from the ISO definition for film cameras, which has been adapted for film speed to be adjusted). For DSLR cameras, the profit is increasingly better signal. Like all electrical circuits are image sensors are not perfect, and the image signal, but also produce some noise in the form of unwanted random errors in the signal chain. The noise in digital images appears as patches of grain or wrong color. To avoid tooyou put a lot of noise, the photographer-night, the camera's ISO to a value high enough to illuminate the image and maintaining acceptable levels of noise. Today, the maximum is usually 1600, but some cameras produce images perfectly usable at ISO 3200, 6400 or 12800.

In addition to the standard ISO settings, digital cameras are now leading noise suppression on digital images. As a result some additional revenue is up to the camera enabled, sometimes a step(H1), and in fact, twice the maximum ISO setting, but also a short walk (H2, 4 times) and three (H3, 8 times). The ISO setting is now extended on most digital SLR cameras. For example, to allow both the Canon EOS-1D Mark IV and Nikon D3S three levels of the extended ISO, the ISO setting to an equivalent of 102,400 results! It 'important to note that the images are set as this is generally a high level of noise and significant deterioration of the resolutionbecause of noise reduction techniques. Of course, as with all electronic circuits with high gain noise significantly degrade image quality.

Night Vision Modules

Today's digital SLR cameras allow the photographer control over aperture and shutter speed ISO settings allow the collection of excellent images for use in low light conditions, the otherwise possible. But in many situations, such as photographing scenes at night with little ambient light, ortelephoto lens at night at a distance, digital SLR cameras simply do not have enough sensitivity for shooting enough. In these situations, night vision equipment modules, the ideal complement.

Night vision accessory module fits between the lens and SLR camera body. Just remove the lens, attach the night vision module for the camera and put the 'target. AstroScope night vision modules are designed tocombinations are perfectly integrated with the camera and lens, maintaining all electronic functions of the camera lens (with image stabilization) on the camera sled. The night vision module is powered directly from the camera with power and off easily by opening the shutter.

The night vision module has an automatic control of gain, that its performance is ensured relatively constant. As the camera settings, are relatively easy toConfigure as follows:
• Exposure time 1 / 30 sec (no need to make it shorter, because the amplifier has its own GAL)
• Manual iris (lens, so that the F-stop setting stays put)
• F-stop at maximum aperture (warning light)
• ISO setting to a noise level of the camera is not shown, adapted
• Auto Focus Off (image intensifier scintillation autofocus sensors can be confused)
• Image stabilization on (to maintain stable images duringThe camera is in motion)

Summary

The development of digital SLR (DSLR) continues with features that impressive speed, with a uniform. For the photographer or the military police, the new models of digital SLR cameras and new features can be very useful for portable monitoring and field to collect information, both at night and during the day. Some advantages are:

• Image sensor array to continue to grow in physical size, now withFull-frame format is the traditional film SLR cameras.

• Pixel thick, even more, the resolution and the ability of digital SLR cameras to recognize a total of more than recognize and identify objects at a distance.

• Improved sensitivity of the cameras, cameras with ISO settings up to 12,800 natives.

• night vision modules are available for the light intensity of 8-10 f-stop, while they continue to improve with the electronic controls lenscontinue to work, even the image stabilization.

DSLR continue modules are highly valued by military photographers view other styles because of their large camera sensors, resolution, sensitivity and versatility in the field, the availability of a wide range of lenses and night.

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Are you worried that your photos are taking up too much space on your computer? Most of us love taking photographs. There is a high likelihood that you have a multitude of folders on your internal hard drive which contain hundreds, maybe thousands, of photographs of your friends and family.

If you have noticed that you computer has begun working a bit more slowly, it may be because you have taken up too much space on your internal hard drive. Today, many people are deciding to use external hard drives to store specific items from their personal computers.

External hard drives can also be particularly useful for those who like to save a bunch of photos. This is because they can be effortlessly transported and shared between computers. Additionally, it’s a great way to separate business and pleasure if you only have one laptop for both. You may not want to lug a laptop full of your favorite party photos along with you to work. Therefore, storing them on an external drive may be the option for you.

If you don’t have a ton of photos on your internal drive, you might consider using an external drive to simply back up the photos that you do have. After all, it may not be wise to have all your photos stored in one location. If your computer suffers a crash, or your laptop is stolen or broken, you are running the risk of losing your precious photos forever.

Additionally, photos can take up a surprisingly large amount of room. If you take photos using a standing Digital Single Lens Reflection camera, then it is likely that your unedited photos are going to be in a very large, very space consuming format. Generally, DSLR photos are going to be over 1500 megapixels and are going to be either in RAW or JPEG formats. Files this big can fill up gigabytes of space in no time!

If you are a professional photographer, you will know that external hard drives are absolutely necessary. They will allow you to save raw, unedited photos from your clients’ events without taking up precious space on your computer’s hard disk drive. If you like to keep an archive of all your old photographs, it is likely that you will have multiple external hard drives. It is also likely that these drives will be relatively large, because photography is a job that requires hundreds of gigabytes of storing space.

External hard drives work exactly the same as internal ones. This means that you can simply plug in your external drive and begin editing your photos right from their original file. Then, upon editing them, you can return them to your external drive without ever taking up more room on your personal computer.

External hard drives have far more benefits than drawbacks. So if you want to back up your photos, or if you simply need a trustworthy archive for your photographs, then an external hard drive is exactly what you need!

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Getting just the right lens for each type of photography may not be in your budget, so you will want to choose the lenses that you do buy wisely. There are many different types of lenses that may qualify as a bird photography lens for your digital camera, and there are many that may “seem” to fit the bill but will fail to meet your expectations.

If price is no object for you, then just go ahead and get that $5,000-$8,000 super telephoto lens. But if you are restricted by budget, please read on before making your bird photography lens decision. And know that your choice of lens, because you want to get the best one possible, is going to cost you from several hundred up to fifteen hundred dollars.

There are 3 things to consider when you are buying a bird photography lens.

Get the birds close. This means getting a long enough focal length to be able to fill the picture frame with the bird. Usually a minimum of 300mm, but 400mm would be much better.
The lens must focus quickly. You don’t want to miss bunches of shots while your camera lens searches for the right focus.
Image quality must be great. (This is a necessary qualification for any lens you purchase).

The best way to know whether the lens you wish to purchase is the right one for bird photography is to ask those who are already satisfied with their lens setup. Check the camera forums at fredmiranda.com or dpreview. There are lots of bird photographers who hang out at those two places.

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Author: Carol A Miller
Source: isnare.com

Iadmit it – I'm slow to embrace the phenomenon of digital photography. As a hobby, I have two film cameras, an old manual focus Nikon and Canon Rebel latest auto focus, and I resist the temptation to enjoy a digital camera until recently, even though each of my children had them for years. But recently my father gave me his Olympus average price (he did not like the menu), and I was giving it a try. And to my surprise, I also it.My favorite thing about the camera is pretty clear – no film. My father gave me two (bless him) memory cards, substantial, and I do not run out of, rebel digital slr, film. I do not pay for the photos that I do not want to develop now,, rebel digital slr, rebel digital slr, that I've seen (I do not pay for photo developing period), and since it can really see how you look at the scene, Bad pictures can I store more. Taking great, rebel digital slr, photos helps me to improve, and improves the chances, rebel digital slr, of a better image even media, and now it's free. My camera settings, rebel digital slr, that allow, rebel digital slr, me to pretend I movie – I can on the movies and the speed of, rebel digital slr, opening / shutter combinations, as with my other cameras, so I can use what I know about photography,, rebel digital slr, which I like very much. And I do not have to wait to see how the pictures, rebel digital slr, out.The other really cool thing about digital photography is photo editing. I have not yet invested in Photoshop, but I have my eye on the elements of the program for next year. I just use Google's free Picasa, and sometimes my PhotoDeluxe Editor (Fri came with my scanner), and even then I have an incredible amount of really exciting things with my pictures. It 'best to make the risks very badly (I admit, I often notice from light). With some modifications, it would be a disposable photo is a keeper! I easily remove, rebel digital slr, red eye, sharpen focus,, rebel digital slr, adjust contrast, warm-up color, and remove excessive unwanted tint (such as the lamp). Culture is my favorite – the more fortunate that their darkroom crop their photos regularly, but there are people who regularly used to take what we have – no more! We are able to choose, and the glory in removing unwanted background,,, rebel digital slr, rebel digital slr, or sky – you can also remove most of the blow and make it a close-up. The format is a snap – Want a wallet? N. sweat. 8×10, 5×7, some extravagant size – just a simple selection will do. And do not forget the special effects. According to the editor, you can convert images into a painting, add flash, filters, neon – your imagination can Go Wild! If your masterpiece is ready to go, you can print on paper at home, or you can send for processing. Using Picasa, you can click and send it, rebel digital slr, to a processor via the Internet, and get your professionally printed photos by mail – but only one has decided that you want. You can upload your photos to a, rebel digital slr, Web page, e-mail, use a blog or MySpace – are easy, rebel digital slr, to share.So, rebel digital slr, as you can see, I am a convert to digital photography. There is so funny that in this form of control over your work really rejuvenated my love for photography. If you do not have to repent, believe. It 'really a breath.

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Author: Carol A Miller
Source: articledashboard.com

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Author: Carol A Miller
Source: download

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