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Starlight Xpress TRIUS PRO 694C, Руководство пользователя

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Starlight Xpress TRIUS PRO 694C Скачать руководство пользователя страница 19

Handbook for the TRIUS PRO-694C      Issue 1 September 2020 

 

 19 

 

M42 – 30 seconds exposure at F2 with a C8 Hyperstar 

 

2) Once you have subtracted any dark frame, you can convert the raw image to 

colour. 

 

 

 

3) The resulting image will probably look faint and dull, possibly with a pale yellowish 

background, due to light pollution so it is now time to process the ‘luminance’ 

(brightness and contrast) of the image to get the best visual appearance. First, use 

the ‘Normal’ contrast stretch to darken the background by setting the ‘Black’ slider 

just below the main peak of the histogram. Alternatively, you can use the ‘Remove 

Background’ option to let the software decide on the best setting. This will greatly 

reduce the background brightness and the image will begin to look rather more 

Содержание TRIUS PRO 694C

Страница 1: ...the original TRIUS main board and has both improved read noise and faster download time It features an internal USB hub with 3 external ports and a dry argon CCD chamber fill The USB hub permits sever...

Страница 2: ...imaging especially with an H alpha filter The H alpha QE is about 65 considerably better than other interline chips and even greater than the popular KAF8300 CCD The full frame download time is appro...

Страница 3: ...minimum of 1024 x 768 pixels and 24 bit colour A medium specification i7 machine is ideal but most modern computers are OK Please note that USB 2 0 operates at a very high speed and cannot operate ove...

Страница 4: ...ill automatically find the drivers You can check this by opening Device Manager and looking for a Starlight Xpress CCD in the USB Devices list Now connect up the power supply and switch it on The supp...

Страница 5: ...ou can go much colder especially if you are imaging during the winter months Under indoor conditions the low airflow will limit the cooling capability and you should use a set point of no lower than 1...

Страница 6: ...oject an image onto the CCD surface You could use your telescope but this introduces additional complications which are best avoided at this early stage There are two simple options one of which is av...

Страница 7: ...o the smallest aperture number possible usually F22 as this will minimise focus problems and keep the light level reasonable for daytime testing The pin hole needs no such adjustments and will work im...

Страница 8: ...rken 3 If the USB did not initialise properly the camera start up screen will tell you that the connection is defective Try switching off the power supply and unplugging the USB cable Now turn the pow...

Страница 9: ...s out the colour information All images that you intend to colour convert must be taken in binned 1x1 mode Also please note that you cannot sum frames together before colour conversion This must be do...

Страница 10: ...r noise 4 Apply Anti Alias Runs a special filter over the colour data to remove coloured artefacts around sharp edges This is especially useful for cleaning up erratically coloured star images 5 IR Fi...

Страница 11: ...ure we can translate this into true colour data It is very important that the software knows the colour filter positions or the colours will be translated incorrectly so the software allows the user t...

Страница 12: ...saturation parts of the image Just move the sliders by small amounts in the clear area below the main peak until the background is nicely balanced In some cases the histograms may all start a long way...

Страница 13: ...tware Astronomical Imaging with the TRIUS PRO 694C 1 Getting the image onto the CCD It is fairly easy to find the correct focus setting for the camera when using a standard SLR lens but quite a differ...

Страница 14: ...mmend it from personal experience It does not require a yellow filter for aberration correction unlike some other designs so it can also be used for tri colour imaging If you use a focal reducer using...

Страница 15: ...select the SXV camera interface File menu Set the camera mode to Binned 1x1 and select an exposure time of 1 second Press Take Picture and wait for the image to download There is a good chance that yo...

Страница 16: ...If so you are now in a position to take a moderately long exposure of some interesting deep sky astronomical object I will deal with planets later As most drives are not very accurate beyond a minute...

Страница 17: ...acting a dark frame can actually INCREASE the noise in your images This is because the statistical noise of the dark frame can exceed the pattern noise from warm pixels and hence add to that of the su...

Страница 18: ...umns or shadings that are created during readout To record a bias frame cover the camera aperture and take a 1000th of a second exposure If you take at least 10 such frames and average them together t...

Страница 19: ...ackground due to light pollution so it is now time to process the luminance brightness and contrast of the image to get the best visual appearance First use the Normal contrast stretch to darken the b...

Страница 20: ...to use a Non linear stretch to compress the brighter regions while expanding the faint data Here is the result of a non linear stretch on the M42 image The image now looks quite impressive and I hope...

Страница 21: ...tures of the planets Planetary imaging is in many ways quite different from deep sky imaging Most deep sky objects are faint and relatively large so a short focal length and a long exposure are needed...

Страница 22: ...r zero due to the dark background If you use too short an exposure time the image noise level will be increased and if too long a time is used you will saturate the highlights and cause white patches...

Страница 23: ...ary images together to improve the signal to noise ratio In this case the averaging option should always be used or the result is likely to exceed the dynamic range of the software and saturate the hi...

Страница 24: ...poses but it will often provide more resolution than the optical system or the seeing allows Binned 2x2 mode sums groups of 4 pixels into one output pixel thus creating a pixel image with 4 times the...

Страница 25: ...ng and water resistant and can be easily replaced if damaged Stretch a piece of the film loosely across the aperture of your telescope and point the instrument high in the sky to avoid any gradient in...

Страница 26: ...ore obvious There is no great difficulty in removing such particles on the outside surface by the careful use of a lens cleaning cloth lens pen or air duster and so you should have little trouble with...

Страница 27: ...T rub vigorously and be very careful to avoid scratching the window 6 Before re assembly make certain that the inside surface of the front window is also clean and then carefully replace the camera fr...

Страница 28: ...DO NOT leave the camera switched on for long periods between uses The cold CCD will collect ice by slow diffusion through any small leaks and this will become corrosive water on the cooler and CCD pin...

Страница 29: ...Sony ICX695ALG EXview interline imager CCD size Active area 12 48mm x 9 98mm CCD pixels 2750 x 2200 pixel array Each pixel is 4 54 x 4 54uM square Bayer Matrix RGBG primary colour Well depth Full res...

Страница 30: ...f Purchasers CONDITIONS OF GUARANTEE 1 The equipment shall only be used for normal purposes described in the standard operating instructions and within the relevant safety standards of the country whe...

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