Celestron NexImage 95518 Manuale d'uso - Pagina 9

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To explore the many other features of RegiStax and view helpful tutorials, visit the

RegiStax homepage at: http://www.astronomie.be/registax/index.html

How NexImage Works

NexImage uses a light-sensitive imaging sensor to capture streaming video of any Solar System

object. Using the included software, you can separate the video into hundreds of individual images

(frames) and digitally stack them to significantly reduce the electric "noise" inherent in video chips

and bring out the unseen fine detail (signal) hidden within your image. The NexImage camera

takes advantage of the fact that the signal-to-noise ratio of your stacked composite image is

proportional to the square root of the number of frames combined. This means that stacking as

few as 16 frames will reduce the grainy noise of the composite image by 4 times. While stacking as

many 900 frames will improve the image by 30 times! However, stacking the individual frames is

only half the power of the NexImage imager. With the included software package, each individual

frame is analyzed for quality to filter out those frames most affected (blurred) by poor atmospheric

"seeing. " This form of after-the-fact adaptive optics leaves only the sharpest, clearest frames to be

stacked and aligned into a high-quality image. Finally, powerful processing features automatically

break the image up into individual unsharp mask layers that can be used to bring out tremendous

detail and reveal final images that will rival those taken with astronomical CCD cameras costing

thousands of dollars.

The Basics

Focusing

As with all astrophotography, sharp focus is essential for high-quality results. Although there

are many techniques and devices for focusing your telescope, the human eye still remains one

of the best detectors of subtle changes in detail. One advantage that video imaging has over

imaging with more sophisticated (and expensive) CCD cameras is the speed with which it can

display an image. Focusing NexImage is more like focusing an eyepiece than focusing a CCD

camera. Unlike long-exposure cameras, you don't have to wait many seconds to see the effect

of a focus change using NexImage.

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