http://www.nikonchat.com/nikon-camera-charts/
Tips on creating stunning photos of night vision digital SLR
Tips on creating stunning digital SLR photos Night Vision
Today's digital SLR cameras offer the photographer full control of aperture, shutter speed and ISO settings that allow excellent capture images to use in low light that was not otherwise possible. However, in many situations, such as photographing scenes at night with ambient light little or telephoto pictures of the night at a distance, even the latest digital SLR cameras are simply not sensitive enough to capture images appropriate. In these situations, night vision modules such as those described here are the perfect accessory. This article provides important guidelines for the production impressive photos of the night-when using a night vision module enabled digital SLR camera.
By adding a night vision module to a digital SLR camera, night turns to day. Follow these instructions to ensure the best possible image quality.
Due to the increased availability of high performance digital SLR cameras capture great pictures at night is now easier than ever. With total control setting aperture and shutter, as well as increasing electronic (ISO), the photographer has the opportunity to capture images with little light that was not otherwise possible.
However, in many low light and night situations, digital SLR cameras just do not have sufficient sensitivity to capture adequate images. On the one hand, with the decreasing size of the pixels, it is notable that the sensitivity to light has not worsened considerably with each new generation camera (sensitivity to light and which is directly proportional to the area of detector pixels). But fortunately, there has been a great development of the camera in the noise reduction sensitivity has kept pace, if not improved slightly with decreasing pixel area. Despite these changes, the fact is that a time sufficiently long exposure can not be used, either because there is movement in the scene or the camera is moving (being handheld or on a moving vehicle) the long exposure times lead to confusion. For situations like photographing scenes at night with very little ambient light, or photography telephoto lens at night at a distance, even the best digital SLR camera will not be able to produce adequate pictures without blur.
href = "http://www.nightvisioncameras.com/"> In these situations, night vision module, such as those described here are the ideal accessory (www.nightvisioncameras.com). Such a device is placed between the lens and lens reflex camera body and amplifies the light that is captured by the objective lens, projecting an amplified (but totally green) image sensor digital camera image. The result is up 10 F-stops of improvement, a dramatic change that allows many applications that are otherwise impossible photograph. The module transforms scenes illuminated by the moon or starlight in a bright, high resolution that are easy to photograph.
HOW IT WORKS
AstroScope transforms dark scenes in bright, high resolution images that can be easily photos without additional lighting or exposure time. The objective lens focuses the minimum amount of light available on the faceplate of central strengthening internal unity that converts photons into electrons. The flow of electrons is then amplified and the electrons are accelerated so that when they impinge on the output phosphor, a bright green color image is created. The image is then focused on the detector's internal digital SLR camera.
Learn More information: www.hownightvisionworks.com
The following are some guidelines to help ensure that digital photos are the best night vision possible.
Exposure Mode
Select Manual mode exposure ("M"). It is not "automatic", "aperture priority", "Shutter Priority", "Program" or any special modes. In low light, you must manually open the lens iris to allow more light falling on the module sensitive photocathode Night Vision.
Setting shutter speed
You want to set the shutter speed the camera to be long enough that there will be blurred due to movement, usually around 1/30th second. And exposure times usually result in blurring (for handheld applications). Less exposure time can provide some improvement if excessive movement is a concern, but unnecessarily may obscure the image due to the reduction of the light that was acquired in the form of night vision image intensifier. While the output brightness of an increase intensifier image scene illumination increased in higher stage lighting, the image intensifier output brightness reaches a maximum and remains constant as shown in the accompanying graph. (The limitation on the output brightness protects troops using night vision goggles to be blind when you see a bright light). From this maximum brightness is not very bright (about 2 feet lumens), it is unlikely that the digital camera sensor is saturated as a result. Therefore, faster Shutter speeds are not needed as a method of limiting the accumulation of light.
ISO Sensitivity
While in the days of film photography, ISO was a feature that describes the film sensitivity to light, at present, the ISO is related to the electronic gain the digital camera sensor. Since the increase of the gain to amplify the low light level images, even with a night vision module, the lower light scenes become visible. However, there are disadvantages to the establishment of the ISO too high. As with all high-gain electronic circuits, image noise may degrade image quality. As such, sets the camera's ISO to a value as high as you can at the same time acceptable levels of image noise. In general, the minimum value would be 800, but some cameras offer a perfectly usable images at ISO 1600, 3200 or 6400 (in some recent Nikon).
Approach manual
When using a night vision module, select manual focus (usually a small lever switch on or near of the objective lens assembly). Manual focus gives you more control over how the focus appears. From night vision modules are usually grain, grain Image sensors can confuse the focus SLR camera. Also, realize that these sensors will focus looking at the output of the night vision module grain artifacts will not be affected by the lens focus position (located in front of night vision module).
Use Stabilized Lens
function of a camera image stabilization allows the photographer to use slower shutter speeds without blur occurs due to movement of the camera. Note that there are two main techniques for image stabilization, optical stabilization (where a small element within the lens moves to stabilize the image on the detector of the camera) and digital stabilization (which take advantage of rows and columns in the perimeter of the detector, changing the image an appropriate amount to stabilize certain types of movement).
Typically, image stabilizers Optical, though more expensive, are preferable, since better remove the blurring effect of components of the proposal. When using a night vision module, the main disadvantage of the digital age is that the image stabilization is blurred at the entrance of the night vision module that results in some blur in the output image intensified. Therefore, optical stabilization is preferred.
Lens Aperture
The fundamentals remain valid for viewing intensified night shooting in low light. In low light situations, you have to select the best objective lens set to the lowest F-stop. (The lowest F-stop indicates that the iris is fully open and possible to gather ambient light for the lens).
Nikon and Canon offer quickly stabilized telephoto lens lenses that are ideal for night vision applications.
Infrared Illuminator
Sometimes, even with a night vision module is simply too dark to get a good quality picture at night. A dark and cloudy night without light environment is an example. From night vision module is more of a light amplifier, if no starlight and sky or the city lights reflecting clouds, night vision module will not be effective. To take pictures without using a flash or visible light source, a source of near-infrared light can be used which emits light can be seen by night vision module, but is invisible to the naked eye. Unlike other digital camera sensors have a certain response in the infrared near night vision modules are more sensitive to near infrared wavelength and therefore these light sources can significantly improve image night and make night photography possible despite the lack of sufficient visible light.
Invisible near-infrared light can be used to illuminate scenes that are otherwise very dark.
Image cropping
Because image intensifiers have the characteristics electronic automatic gain to maintain a constant light output, the presence of bright lights in the field of view (such as headlights or street lights) may have the effect of decreasing the gain of the light unit general. This is similar to the scenes with backlit for the photograph of United Nations-intensified, but more importantly by the significant impact on the gain of light that could result. This may cause concern to other regions in the image to darken to a unacceptable level. If possible, make every effort to exclude unimportant bright lights from the field of vision.
Shut off all visible camera / Audible Features
For covert night vision photography, do not forget to turn off all lights of the camera and audio functions. (Example: turn off the flash, all arrangements red eye reduction, autofocus assist, LCD preview, and all the beeps).
Use a tripod
When handheld use is required, select an exposure time long enough for the movement of objects under observation does not result in blurred images. As with the picture of the United Nations, intensified, long exposure require to keep the camera still to avoid blurring. A tripod is a perfect accessory. If one is not available, try to strengthen the camera against a stationary object like a tree or a wall. In order to avoid the blur that results from pressing the shutter release (which can cause enough movement to blur a picture), use the camera timer.
For more extensive white papers, visit our online Knowledge Center.
www.electrophysics.com / Night Vision
373 Route 46, Fairfield, NJ 07004
Phone: 973-882-0211 Fax: 973-882-0997
www.electrophysics.com
© 2008 electrophysical Corp. All rights reserved.
An ISO 9001:2000 Certified Company UKAS # 7096 – ANAB # A060693
About the Author
Merchant Account Comparison Chart for Droid Credit Card Processing
Nikon News