Acuter Digital Spotting Scope is digital camera and spotting combined into one portable instrument. The patented design using a beam-splitter in the optical path allows users to view the image through the eyepiece or flip screen even when the shutter is pressed. This break-through technology solves the problem with many digital spotting scopes available on the market. Not only can you view objects at high power but you can photograph them simultaneously. Best of all, the Digital Spotting Scope is simple to use and very reasonably priced. It is perfect for sporting events, nature study, bird watching, scenic views, adventure travel, surveillance, and many other things. The 50mmED model is built with a two element air spaced objective. The second element is made of ED fluorite glass for optimal performance.
What is ED
Extra-low Dispersion glass allows the optical designer to virtually eliminate chromatic aberration (false color fringing around bright objects), which results in higher resolution and superior contrast in the images.

For more info, please check out following link
http://www.acuteroptics.com/inc/product.php?id=160&class1=4

http://www.skywatchertelescope.net/swtinc/product.php?id=133&class1=2&class2=206


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