Handbook for the TRIUS PRO-25C
Issue 1 April 2019
The TRIUS PRO-25C Colour
CCD camera user manual
Thank you for purchasing a Starlight Xpress CCD camera. We hope that you will be very satisfied with
the results.
The TRIUS PRO-25C is an advanced, high-resolution one-shot colour, cooled CCD camera, especially
designed for astronomical imaging. It uses a version of the very popular Sony 'SuperHAD' CCDs that
offer very high QE and extremely low thermal noise. It is a substantial upgrade on the SXVR camera
range and incorporates several new features, such as an internal USB hub with 3 external ports and a
dry argon CCD chamber fill. The USB hub permits several other devices to share the single USB
connection and greatly reduces the number of cables required in a typical set-up. For example, a
Lodestar or UltraStar guide camera and an SX filter wheel could use two of the USB ports and the
third might connect to an electric focuser, or similar peripheral. The argon fill, along with other
improvements to the cooler stack, has improved the delta T to about -40 degrees C.
As per the TRIUS range, this camera also includes a CCD temperature monitoring circuit that provides
regulated set-point cooling of the chip, adjustable chip alignment and a very compact overall size.
The TRIUS PRO-25C uses a Sony ICX453AQ 'SuperHAD' progressive scan CCD, with 3024 x 2016 x
7.8uM pixels in a 23.4 x 15.6mm active area. This device has an excellent quantum efficiency, with a
broad spectral response peaking at around 60% in yellow light, and an extremely low dark current,
well below that of any comparable CCD currently available. While this device also has an excellent
blue light sensitivity, it has a strong infra-red response, which makes it ideal for all aspects of both
planetary and deep-sky imaging, especially with an H-alpha filter. The H-alpha QE is about 55%,
considerably better than other interline chips.
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