If you seek leading-edge solutions
for low-light imaging, we can help! We’re pleased to provide
products for a variety of night vision applications including: low-light
photography, electronic news gathering, perimeter security, thermal
imaging and long range surveillance. These products are typically
used by personnel involved with special operations, law enforcement,
force protection and Homeland Security. In this website, you will
also find a number of white papers and tools that can be helpful
to support these applications. If you need custom products, please
contact us. Our engineering team has a wealth of experience with
custom night vision systems for very specific applications.
Digital SLR Camera Target Resolution Calculator
Determine the optimum camera and lens combination for your application.
Digital SLR Camera Selection
SLR's not listed?
any digital SLR camera.
NOTE: Registration is required.
Number of Pixels
Detector Size (mm)
Field of View
Lens Focal Length
Field of View (FOV) (degrees) °
Pixel Field of View (IFOV) (mrad)
Range to Object
Field of View at Range (meters)
Pixel Field of View at Range (cm)
H-Size of Object
Max Detection Range (2 pixels)
% of display
% of H display
Max Recognition Range (8 pixels)
% of display
% of H display
Identification Range (13 pixels)% of display
% of H display
dSLR Camera Description and
This Digital SLR Camera Range
Calculator enables the user to easily estimate the maximum
range from which
an object can be detected when using various camera
platforms. It is important to note that these estimates
assume that range performance is based solely on image quality
yielding a method of estimation that's simple to implement.
The estimates are based solely on the object size, distance,
camera objective lens and camera detector parameters. Object
brightness, emissivity, atmospheric conditions, reflectivity
and other factors are not considered. In this regard, the
object size and focal length of the objective lens are variables
to be entered by the user. The spreadsheet also provides
information as to the angular and spatial field-of-view
of different camera systems at a specified range.
The calculations used here are based on the "Johnson Criteria" which were developed many years ago by John Johnson, a scientist at the US Army Night Vision Lab (Night Vision & Electronic Sensors Directorate). Johnson was working to develop methods of predicting target detection, recognition, and identification. He was working with volunteer observers using image intensifier equipment and quantified the volunteer observer's ability to identify scale model targets under various conditions. His experiments produced the first empirical data on perceptual thresholds. The so-called Johnson Criteria have been the basis for many models that predict the performance of sensor systems under different environmental and operational conditions. According to the Johnson Criteria, the minimum resolution (pixels on target) required to achieve a 50% probability that an observer can discriminate an object at a certain range to the specified level are:
Detection — an object is present: 2 +1/-0.5
Recognition — the type object
can be discerned, a person vs. a car: 8 +1.6/-0.4 pixels
Identification — a specific
object can be discerned, a woman vs. a man, the specific
car: 12.8 +3.2/-2.8 pixels
Digital SLR Camera!
Transform your digital camera/camcorder
and capture high resolution images at night and in low-light
situations otherwise too dark for standard digital cameras
and camcorders. With AstroScope, the light amplification
is equivalent to the improvement of 8-10 F-stops, so that
moonlit or starlit scenes are transformed into bright, high
resolution images that are easily recorded.
Digital SLR Cameras:
What's New for
New digital SLR cameras and HD camcorders are being introduced with more features and higher performance than ever before. With AstroScope Night Vision, the night-time surveillance photographer can now realize more capability with one camera or camcorder than was previously possible including an assortment of objective lenses, image stabilization and megapixel imaging.
We hope this information is helpful.
Feel free to email
us with comments.
have made every attempt to provide accurate information. However, we
cannot accept any responsibility for errors or inaccuracies. Should
you require assistance, please contact us directly. Thank you.