In molti saprete che sono uno dei pochi utilizzatori della tecnica del Drift Scan (nota anche come TDI ) per riprendere immagini deep-sky.
Questa tecnica si differenzia notevolmente dalla astrofotografia "tradizionale" in quanto può essere eseguita a montatura spenta.
Maggiori dettagli sulla tecnica del drift scan sono disponibili in miei precedenti post, come, ad esempio :
Per l'uso di questa tecnica è necessario usare un software che supporti questa modalità di ripresa che è presente solo in alcuni programmi molto poco diffusi ( come ad esempio Audela che è quello che uso io).
Ci tengo quindi a farvi sapere che ora anche MAXIM DL , nella versione 4.57, supporta il drift scan per le camere SBIG, come indicato nella mail allegata :
The updated beta release for MaxIm DL Version 4.57 now supports Time Delayed
Integration (TDI), also known as drift scanning, for SBIG cameras. In TDI mode
you turn off the clock drive and allow the sky to drift past the sensor. The
pixels are clocked out of the sensor at the exact same speed as the sky motion.
This allows you to produce a very long strip image. TDI also averages out the
dark and flat field errors, because each pixel in the final image gets
contributions from hundreds of different camera pixels. And, of course,
periodic error and guiding is completely eliminated!
To switch to TDI mode while connected to the camera, go to the Settings tab,
open the Options menu, and click Camera Settings. There you will find a TDI
mode check box.
When you switch to TDI mode, the camera control window user interface changes.
Most of the tabs disappear, and are replaced by a TDI tab. Please see
http://www.cyanogen.com/help/maximdl/TDI_Tab.htm for more information. To
switch back, use the Options menu on the TDI tab to open Camera Settings.
Tip: it is critical for TDI images to get the camera square on to the RA axis,
and also to have an accurate measurement of the telescope focal length and the
declination (determines the drift rate). You can precisely measure all of the
above on a "stare mode" (tracked) image using the Analyze menu PinPoint
Astrometry command.
We expect to go to production release in a couple of weeks. The beta version is
available to all users with current licenses (including demo users). You can
download it from
http://www.cyanogen.com/temp/MaxImDL457.exeIf you get a chance to try this out, we would be most interested in hearing
about your results.
Thanks,
Doug
-----------------------------------
Doug George
dgeorge@...
Diffraction Limited
Makers of Cyanogen Imaging Products
http://www.cyanogen.com
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