Celestron Neximage 5 Manuel utilisateur

USERS MANUAL

Model #93711

ENGLISH

Congratulations on your purchase of the Celestron NexImage 5 Solar System imaging camera.

Your NexImage camera comes with the following:

+ NexImage 5 Camera

+ 1.25” nose piece

+ CD including NexImage iCap and RegiStax processing software

+ USB Cable

Recommended Minimum System requirements:

+ Pentium IV, 2.0 GHz, 1GB RAM

+ Graphics card with 24 or 32 bit

+ Windows XP, Windows Vista, Windows 7 (32 & 64 bit)

+ DirectX 9.0c or higher

1.25”

Nose Piece USB Cable

NexImage 5 Camera

NexImage iCap and

Registax processing

software

Fig 1

Quick Start

1. Place the CD into your computer’s CD rom drive.

2. Install both the NexImage iCap and RegiStax software

onto your computer.

3. Thread the 1.25” nose piece into the body of the

NexImage camera. See Fig 2.

4. Slide the 1.25” nose piece of the camera into the eyepiece barrel of your telescope. See Fig 3.

5. Plug the small end of the USB cable into the port on the back of the camera.

6. Plug camera into the USB port of your computer. Once connected, the Found New Hardware

message will appear. Follow the Installation Wizard until the device has been successfully installed.

Fig 2

Fig 3

Capturing Images

1. Double-click the NexImage iCap icon on your computer’s desktop to start the program.

See Fig 4.

2. If the NexImage 5 camera is not already detected, select the camera and press OK. See Fig 5.

3. Select an easy target like the moon to begin with. Center and focus your telescope on

the speciﬁc feature you wish to image.

4. You should be able to see light displayed in the Preview window of the iCap software.

Fig 4

Fig 5

5. Use the telescopes focuser to focus

the image until object is visible and

sharp. See Fig 6.

6. Use the Gain (A) and Exposure (B)

settings to make sure that the image

is not under or over exposed.

7. Select the video format (C). For the

highest resolution, select 2592x1944.

8. Select the frames per second (FPS)

for your video. The FPS box (D) will

always display the maximum frames

per second for the selected

resolution setting.

9. Press the Video File button (E) to

bring up the Recording Setting box.

See Fig 7 and 8.

Fig 6

Fig 7

Fig 8

B E

10. Press the Video File (E) to select the

destination location for your video.

11. Click on the Advanced tab. You can

either select the amount of time or

number of frames you wish to record.

See Fig 9.

12. Press the Record button (F) when ready to

begin recording video. See Fig 10.

13. Once recording is complete, press the

check video button (G) to view the

capture image.

See the Help ﬁle (H) to learn more about the advanced features of iCap software.

Now that your video is captured, you are ready to process it into one high resolution image.

Fig 9

Fig 10

Processing Images

1. Double-click the RegiStax icon on your computer’s

desktop to start the program. See Fig 11.

2. Press the Select button (A) and select the video that was just recorded. See Fig 12.

3. Press the Set Alignment Points button (B) to have RegiStax automatically select the alignment

positions over your image.

4. Press the ALIGN button (C) to begin the alignment process.

5. Select the Best Frame option under the Limit Setup box (D) and enter a number that represents

one-half of the number of image frames that were captured, i.e. if 300 frames were captured

then enter 150. Press the LIMIT button (E).

Fig 11

Fig 12

6. You will automatically advance to the STACK screen. Accept the default settings and press

the STACK button (F). See Fig 13.

7. Next moved to the wavelet processing screen by clicking on

the Wavelet tab (G). See Fig 14.

8. On the wavelet page use the wavelet-sliders (H) to enhance

the image. The power of RegiStax sits in the usage of Wavelets.

This is a special ﬁltering technique that is very good for enhancing

details in images. Each wavelet layer carries part of the image

within it. The lower numbered wavelets control the ﬁne detail

stored in the image whereas the larger numbered wavelets

control the coarse detail. Each layer can be adjusted individually

to reveal the desired amount of detail for your image.

9. Finally, press the SAVE IMAGE button to save the ﬁnal image.

Fig 13

Fig 14

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

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

How NexImage works

NexImage utilizes a light sensitive imaging sensor to capture streaming video of any solar system

object. This video can easily be viewed as hundreds of individual images (frames) that can be

digitally stacked 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 in which it can display its image.

Focusing NexImage is more similar to focusing an eyepiece than a CCD camera. Unlike with long

exposure cameras you don’t have to wait many seconds to see the effect of a focus change.

Focusing Tips

To achieve best focus, concentrate on a high contrast feature of the object you are imaging. Focusing

on small features such as a moon’s shadow on Jupiter or Cassini’s division in the ring of Saturn will

guarantee best focus across the entire image.

Once the frames of your video are stacked, the overall brightness of the composite (stacked) image is

usually brighter than its individual component frames. For this reason it is best to keep the brightness

of the video image seen on the screen dimmer than you would normally desire. It is important that

no part of the image is over-exposed to assure the maximum amount of detail in the ﬁnal composite

image.

Collimation

No matter what type of telescope you image with, poor collimation (alignment of the optics) will

ruin your chances for a good image. Before you begin imaging, always check the collimation of your

instrument and make adjustments if necessary. Refer to your telescopes owner’s manual for instruction

in collimating the optics.

Finding Objects

At ﬁrst it can be difﬁcult to locate individual planets due to their relative brightness. To make it easier

to initially ﬁnd your object in the imaging window, increase the brightness and gain controls on

the Exposure Tool Bar. This will allow you to better see the object as it passes through the imaging

window. Once the object is located and centered, you can adjust the setting until the object is at the

desired brightness and contrast.

How long to take Streaming Video

At ﬁrst you may think that the more frames you record the better. However there are some limitation

to the duration of video and the amount of frames you can acquire. Resolution and ﬁle size can both

limit the length of time of your video.

Since the NexImage will combine as many sharp frames as possible to achieve one high quality image,

you don’t want to take so many images that you start to detect the rotation of the planet, especially

on Jupiter which makes one complete rotation in under 10 hours!

Also each frame of a high resolution video can equal a large ﬁle size. Hundreds of frames can

take up much of your hard drive space. Since ﬁle sizes of each video taken can be quite large, it is

recommended that you save your video data onto a CD-ROM. This way you can have a library of ﬁles

stored for processing without ﬁlling up your hard drive in the process.

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