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Photography - Understanding Film Vs Digital Cameras

Emulsion film, as a medium for capturing photographic images, has been around in one form or another for more than 150 years. But due to the rapidly growing popularity of digital cameras, newcomers to photography are sometimes surprised to discover that film is still being manufactured and sold for all-purpose photography. Once their first digital camera is in hand, and they have mastered the art of recording images electronically, and storing them as files, the idea of using film seems a strange concept indeed.

So why is film still being used by some photographers?

To understand the answer to this, we will need to take a look at the differences between film stock and the modern image sensors that make digital cameras possible.

Let's start with the newer technology: the light sensitive electronic surface that sits at the center of a digital camera, and which is known as an image sensor. Basically these sensors are a specialized form of microchip. But they do not carry out any computations. Instead, all they do is measure the amount of light that falls on different parts of the sensor surface in a given time window. If you were to zoom in on one of these thumbnail-sized chips, blowing it up to the size of a football stadium, you would see that the surface of the sensor looked a lot like your tiled kitchen floor.

Each one of those square tiles represents a separate photodiode, capable of measuring just the amount of light that falls on it. In fact, sitting just above each photodiode is a colored filter. The filter is there to block all but the wavelength of light that it sends on to the photodiode. These filters come in red, green, and blue, so that any given photodiode will be measuring only the intensity of light for the particular color of the filter sitting above it.

Imagine for the moment that every tile on that kitchen floor is green. Now take one row of tiles and color every second tile blue. For the next row of tiles, color every second tile red, but shift the red tiles across by one space so that the red tiles appear beneath the green tiles of the previous row. Then repeat the process with blue tiles on the next row, and so on, until the entire floor is covered with these alternate rows of green/blue and green/red tiles. This is just what the surface of the image sensor looks like when seen close up.

In point of fact, this particular arrangement of colored filters, with twice as many green pixels as either red or blue, is known as a Bayer array. It is the most commonly used color filtering method employed in digital cameras, but it is by no means the only one used. Because the human eye is more sensitive to green light than red or blue, the green-favoring of the Bayer system actually works to its advantage when the colors are finally combined to produce printable images.

Every time a digital camera is used to record an image, this mosaic of colored tiles captures the various intensities of red, green, and Blue Light. So every photodiode, or "electronic pixel", has associated with it a color and a number. If a perfectly green lime was being photographed, the red and blue pixels would have the number zero associated with them, while the green pixels around them would carry non-zero numbers. In reality, small contributions of red and blue light would be mixed with much stronger green contributions to produce the hues of green that color the skin of the lime.

All of this information is whisked away from the image sensor and stored in a temporary image buffer, later to be transferred to the memory card used by digital cameras to store images as files. Software is then used to manipulate the images (or not) before they are finally sent to a photo printer.

The resolution of the images is determined by the number of photodiodes (pixels) that can be crammed onto the surface of an image sensor. These days it is not uncommon to find about 4000 pixels along one edge of the sensor, and 2500 along the other. The product of these numbers is 10 million, or 10 megapixels in the digital camera parlance.

So, how does this compare with film resolution?

Well, these days the brand of film stock recognized as offering the finest resolution is Fuji's Velvia 50 RVP. While it is not possible to ascribe a grain size to the emulsion that is used in slide film (there are a number of different sized grains in the dyes that make up the emulsion) an effective number of pixels per inch can be assigned to film stock based on how many closely-spaced "thin lines" can be resolved in the laboratory. The effective PPI, or pixels per inch, for Velvia is about 4000. This translates, assuming a 35mm frame size, to about 22 megapixels of image resolution. For better known film brands, like Kodachrome, the number is closer to 9 megapixels.

Clearly, with current top-end digital SLR models offering resolutions that surpass 20 megapixels, the numerical advantage that film once offered in terms of image resolution has all but vanished. Digital cameras now match the image resolution of even the very best film stocks, and will surpass them as image sensor technology continues to improve.

So now we are back to our still-answered question: why is film stock still produced when digital imagery is on a par with it, at least in terms of resolution?

The answer is that resolution is by no means the full story when it comes to creating a great image. As mentioned, emulsions contain a range of grain sizes and dye components that work together to produce effects that cannot easily be reproduced with three sets of red, green, and blue numbers. Velvia, for instance, adds more warmth to the actual recorded colors, and produces landscape images that look better than the real thing.

Fortunately for us, the makers of film stock, and the makers of digital cameras, are not, by and large, the same people. Otherwise film stock might disappear a lot more quickly from the world of photography. That probably will not happen for a while though. Not as long as film stock can produce images that surpass the quality of digital methods. Until that is no longer the case, photographic film will have a place in the world of photography.

To help you select a suitable digital camera to get started with, I have put together an article for you about how to find the right Beginner Digital Camera.

Whether you need a simple point-and-shoot model, or a more complex digital SLR model, you will find the answers, and greatly discounted digital camera offers, at http://www.bestdigitalcameradiscounts.com/

About the Author

Stephen Carter is a web developer and creator of the review script Review Foundry. He is also the creator of Best Digital Camera Discounts His interest in photography spans decades.

I have been to have a mediocre visual quality of my recordings at home when I burn a DVD.?

The camcorder I have is a hard drive the JVC Everio. Playback looks great right from the camera, but no matter the method I use to record on DVD (right to a DVD recorder via S-cap or through my computer in the DVD), the images look a bit rough and the color appears to be spotted. I recorded from the high quality camcorder and burn DVDs using the highest quality of my hard drive computer. All tips to get better quality would be greatly appreciated. I have 512 MB of RAM.

simple answer, start burning movies at 4x slower than you burn more clarity. check it out for sure ...

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Clover LCD26164 16-Channel Video Surveillance System - 4 x Camera, Monitor, Digital Video Recorder - 26 Active Matrix TFT Color LCD - 750GB Hard Drive $1809.99 Clover LCD26164 16-Channel Video Surveillance System - 4 x Camera, Monitor, Digital Video Recorder - 26 Active Matrix TFT Color LCD - 750GB Hard Drive

Swann Digital Private Eye Covert Camera and Recorder $99.99 Keep an eye on your home or office with this surveillance camera that features a 1/4" color CMOS image sensor and 640 x 480 resolution for clear, detailed images. The Secure Digital card slot allows you to store images for later viewing.

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640*480 Clock Style Digital Video Recorder, Motion-Activated, Hidden Pinhole Color Camera(QW113) $54.99 HighlightsThis working Clock contains a pinhole digital video recorder, the pinhole camera is really hard to be found by human eyes, this high class table clock with metal housing looks like a crafts, this spy video system can be applied to almost any situation. This model is operated by internal Li-ion battery. The camera is very easy to operated by pressing a button. Features640x480 Clock Style Digital Video Recorder, Motion-Activated, Hidden Pinhole Color CameraHigh class analog table clock with swivel standMetal housing with shinning adornmentDigital video recording function Photo camera functionMotional-activated auto video recording Its PC camera functions offer easy enjoyment of network lifeRemovable flash disk functionSD (TF) card socket: Support up to 8G micro SD (TF) card (not included)USB interface: USB1.1 / 2.0Power Source: Internal 300mAh Li-ion Battery Built-in MIC: Yes Video file format: AVIVideo file resolution: 640x480Video frame: 30 framesImage file format: JPGImage resolution: 1280x960Frame rate: 30 frames per secondVideo file auto saving after 30 minutes video recordingControl buttons: Power On/Off, Photo/Motion-Activated mode switch, Time AdjustingMode status LED indicatorsUser Manual English USB charging and data cableDriver CD includedUnit dimension: 6.6x6.6x1.5 cmUnit net weight: 125gIn retail packaging SpecificationSensor: CMOS SensorVideo Resolution: 640*480V @ 30 FPSFile Format: Video format: AVIImage format: JPGMicrophone: Build-inE*ternal Memory Type: Support up to 8G micro SD (TF) cardPower Supply: Internal Li-ion BatteryOperating Temperature: 0℃~50℃/+4℉~122℉Storage Temperature: -20℃~80℃Operating Humidity: 15~85% RHConnectivity: USB1.1 / 2.0Product Size: 6.6*6.6*1.5 cmAccessories: USB charging and data cable; Driver CD

The Recorder $16.36 The Recorder

HD 1280x960 Clock Style Digital Video Recorder, Motion-Activated, Hidden Pinhole Color Camera (QW082) $66.99 HighlightsThis working Clock contains a pinhole digital video recorder, the pinhole camera is really hard to be found by human eyes, this high class table clock with metal housing looks like a crafts, this spy video system can be applied to almost any situation.SpecificationSensor: CMOS SensorVideo Resolution: 1280x960V @ 30 FPSFile Format: Video format: AVI; Picture format: JPGMicrophone: Built-inExternal Memory Type: Micro SD (TF) card Up to to 8GPower Supply: Internal Li-ion BatteryOperating Temperature: 0℃~50℃Storage Temperature: -20℃~80℃Operating Humidity: 15~85% RHConnectivity: USB1.1 / 2.0Product Size: 6.6x6.6x1.8cm

Small Home Series: 2.4GHz Wireless Security Camera (Weatherproof, Color+NightVision) + USB Digital Recorder Box for Windows PC $79.9 The Wireless Receiver Camera Night Vision Kit lets you create your own home security solution. Such Surveillance Security Camera Receiver with 2.4GHz Wireless Technology provides extended range and clarity while allows you to monitor a wide variety of locations. What's more, this Camera is Waterproof. Wonderful Wireless Receiver Camera Color+Night Vision Kit!Descriptions: Wonderful Wireless Receiver Camera Night Vision Kit suitable for monitoring children, elders and houses, companies, shops and factories, etc; This Surveillance Security Camera Receiver has the characteristcs of wireless transmitting audio & video, record function with VCR/Camcorder or USB DVR Card, small size, light weight, low power consumption, high sensibility, easy operation and installation; 2.4G color camera features new water-proof technology Camera can be used both indoor and outdoor under all different environments 2.4G Wireless Receiver Camera Night Vision Kit is capable of High-quality picture & sound transmitting and receiving 1/3" CMOS, 380TV line; infrared day night camera olux; Pinhole lens, easy for hidden; Built-in 30 LED lights for night vision The smallest and lightest model; Key-press switch receiver; 2-channels available to avoid interference; Min 100m transmission distance without block; Including adjustable bracket, easy installation; TV system: NTSC Operation: Connect the antenna with the Receiver; Plug power jack of DC 12V power supply into the power socket of the receiver (the power indicator is on); Connect the output of receiver with monitor with AV wire; Dial receiver's channel to corresponding channel of Wireless Camera; Adjust the lens of the camera to best position; Package included: 1 x 2.4GHz color camera with record function 1 x 2CH 2.4G receiver 1 x 4CH USB Digital Recorder Box 2 x RCA cable 2 x Power Adapter 1 x English use manual This digital video capture system uses a plug & play USB 2.0 interface so that you can monitor and record feed from up to four different video signals on your computer's hard drive. You may also view the feeds on a TV monitor in either a quad display that shows all four images at once, or a dual display consisting of a main image with a small picture-in-picture window. Since the 4-Camera Color Quad works with virtually any type of camera, you're not limited to certain brands. This 4-Camera Color Quad can automatically save such data as date/time and brightness/contrast/saturation/hue for each camera. The preview window size is adjustable, and you can even define the environment you do not wish to observe by adjusting mask area and sensitivity. Overview 1 CH realtime, 4 CH un-realtime high picture resolution reach D1(704x576) no color distortion, no delay adopt H.264 Compression format Support client soft

4GB Motion-Activated Clock Style Digital Video Recorder with Hidden Pinhole Color Camera (TRA352) $59.99 HighlightsThis working Clock contains a pinhole motion-activated digital video recorder, the pinhole camera is really hard to be found by human eyes, with 4GB memory card inside, this spy camcorder can automatically start video recording once it detects any movement in front of it.This spy video system can be applied to almost any situation.This model is operated by internal Li-ion battery. The camera is very easy to operated by pressing a button on. Specification：Memory: Built-in 4GB Memory Card Synchronous: Video/AudioResolution: Video 640x480Typical Microphone Range: 3mFile Format: MP4-AVISensor: CMOS SensorPower Supply: AC Adapter or Internal Rechargeable Li-ion BatteryConstruction: PlasticAccessories: User Manual Dimension: 180x180x34mm

Car Key Style Mini Digital Video Recorder Pin Hole Color Camera(QW150) $38.99 HighlightsConvenient car key style digital video recording camera. With video capture in computer friendly AVI at 30 frames per second at 1280 x 960 resolution, this pinhole digital video recorder is really hard to be found by human eyes, and it is powered by internal Li-ion battery, and this spy video system can be applied to almost any situation. The camera is very easy to operated by pressing a button. SpecificationSensor: CMOS SensorVideo Resolution: 1280*960@ 30 FPSFile Format: Video format:AVIMicrophone: Built-inPower Supply: Internal Li-ion BatteryOperating Temperature: 0℃~50℃/+4℉~122℉Storage Temperature: -20℃~81℃Operating Humidity: 0℃~50℃Connectivity: USB1.1 / 2.0Product Size: 28.4*23.3*3 cm

Motion Activated and Voice Activated Mini Car Model Digital Video Recorder, Hidden Pinhole Color Camera(TRA472) $60.99 HighlightsThis mini car model contains a pinhole motion activated and voice activated digital video recorder, the pinhole camera is really hard to be found by human eyes, this spy camcorder can automatically start video recording once it detects any movement in front of it or the voice is over 65dB. This spy video system can be applied to almost any situation. This model is operated by internal Li-ion battery. The camera is very easy to operated by pressing a button on.SpecificationSensor: CMOS SensorStill Image Resolution: 640x480 Video Resolution: 640*480 @ 30 FPSFile Format: Video format: AVI; Picture format: JPGExternal Memory Type: Micro SD (TF) card Up to to 8GPower Supply: Li-ion Battery Operating Temperature: 10℃~60℃ Storage Temperature: 10℃~70℃Operating Humidity: 15~85% RHConnectivity: USB1.1 / 2.0Product Size: 7*3.7*2.2cm

Car Video Camera with Laser Indicator Video Recorder(XH-41) $74.99 FeaturesProduct NotesThis camera has no internal memory and does not come with a microSD/TF card. Please insert a memory card before recording. This camera records in 50 minute cycles. When the recording cycle is finished it will automatically start a new recording cycle.For security guards or investigators that will be on the road all day, two memory cards will be required when recording for the whole day.Package ContentsCar Video CameraSuction Base with Flexible Mounting ArmCar Power Adapter (DC 12V)User Manual EnglishSpecificationManufacturer SpecificationsPrimary Function: Car Digital Video CameraImage Sensor: 1/4 Color CMOSMinimum Illumination: 5.0 LUXRecording File Type: AVIImage File Resolution: 320x240Camera Recording Distance: up to 50 metersMemory: microSD/TF card support up to 2GBRecording Time: approx 150 minutes for 1 GB, 300 minutes for 2 GBPower Supply: Power adapter for car cigarette lighter socket (included)Operating Temperature: -10 to +50 CDimensions: Recorder: 85mm x 55mm x 30mm (L x H x D) Suction Base + Arm: 80mm x 125mm (diameter x height)Catalog Ref: Police Car Camera, Road DV Camera, Vehicle Camcorder

AXIS Camera Recorder $1116.39 Features Axis Camera Recorder Software for recording and monitoring. Axis Camera Recorder software offers Windows PC Users all the necessary video recording and monitoring functions for security surveillance at an affordable price. The software enables live video surveillance on a PC, as well as the ability to record video continuously, on schedule, on alarm or when motion is detected. You can be alerted to alarm events by computer sound or e-mail, and search for specific recordings by date/time or event. The Axis Camera Recorder is ideal for maintaining a good visual track on your hotel, service site or factory, or wherever you need to record and monitor movements for safety and security. Together with Axis network cameras and video servers, this versatile software takes advantage of your existing network infrastructure. Axis Camera Recorder Software is easy to use, install and maintain. Download the Axis Quick Reference Comparison Guide. Record from and view cameras at up to 30/25 (NTSC/PAL) frames per second Support for up to 16 Cameras per Installation/License Image database (up to 160 GB) with recovery options Automatic database resizing for continuous recording at low disk space Scheduled recording on time and/or events Advanced Motion Detection with Exclude filter for image areas of no interest. Limit recordings to images on motion or alarm Receive motion alerts via e-mail All system messages on-screen, in log files and optionally via e-mail Find specific recordings by date/time or event Playback of recordings in real-time, or at controllable speed and play direction. Control of pan/tilt/zoom (PTZ) cameras Up to 25 PTZ preset positions per Camera for fast PTZ Control Advanced input/output control Export single images and video sequences AXIS Camera Recorder Supports: Axis Network Cameras: AXIS 2100, AXIS 2110, AXIS 2120, AXIS 2130 PTZ, AXIS 2420. Axis Video Servers: AXIS 2400, AXIS 2400+, AXIS 2401, AXIS 2401+ Devices must be installed with Firmware 2.34 or higher. Requires Pentium 4 1.0 GHz or Faster 512MB RAM 40GB Free Hard Drive Space CD-ROM Drive SVGA or Higher Resolution Monitor Microsoft Mouse or Compatible Pointing Device Windows XP Pro/2000/NT (SP3) Internet Explorer 5.0 or Higher TCP/IP Support

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