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Comparison chart terms explained


Document camera type


This will be either:


Flatbed - These has an area for putting your paper or objects on, usually with lights to illuminate the area:



Gooseneck/arm - These don't have the flat bed area underneath:



Ceiling/suspended - These document cameras are either installed in a suspended ceiling above a table where the presenter will be placing objects to be displayed.  These tend to be very high specification units.  See picture below:





The number of dots or pixels that make up the screen.  Common sizes are 1024x768, 1280x1024 and 1920x1080 (True HD)


Optical zoom


This is how far the camera can zoom in.  This is different to digital zoom, where zooming in just focuses one area of the image and you end up with less pixels being displayed.


Auto focus


When you put an object under a document camera, depending on the size and height you would have to adjust the focus using wheels or buttons.   The more expensive visualisers include auto focus so that when an object is placed under the visualiser the focus is automatically adjusted to give a clear image.


Paper size


This is the maximum size of documents that you can put under to display.  Common values are A4, A3, and B4 sizes.  A4 is the standard paper size for letters in the UK, with A3 being double A4 size.




Some visualisers can be send their images to a computer wirelessly using your existing wireless network.




FPS stands for Frames Per Second.  It is how many images make up 1 second of video.  The higher the number the better quality of video images or output when being displayed on a screen.  30 fps  is TV quality output where 15 and 20 fps is lower quality.




Whether or not the document camera as a built in microphone for recording sound.


Warranty types


RTB - This stands for 'Return to base'.  You will have to send the touch screen monitor back to the manufacturer for repair, usually at your expensive.  The manufacturer will then send it back once repaired.


Collect & return - The manufacturer will arrange a courier to bring box from your touch screen, which you put your touch screen monitor inside and then the courier returns it to the manufacturer.  Once repaired, it is sent back to you. 


Onsite warranty - The manufacturer will send an engineer directly to you who will either repair it or replace the screen.  Please note that if your organisation is not near London, or another major city, there can be delays in getting an engineer to you and we wouldn't recommend choosing one monitor over another just for an onsite warranty.




Any additional features that stand out for this visualiser.