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Review Summary
The 532wsg is an innovative new addition to the QSI 500 Series family of cooled CCD cameras. The "wsg" model has an internal mechanical shutter and filter wheel like the 532ws, plus it adds an integral Precision Off-Axis Guider. This allows guiding using the light from your main telescope while picking off the light from the guide star in front of the filters.
The Precision Off-Axis Guider integral to the 532wsg solves a number of problems with other guiding solutions. Perhaps the key benefit is that RGB and narrowband imagers no longer have to struggle to find a star bright enough to guide by or worry about low signal-to-noise guide stars with filter changes. By positioning the pick-off prism in front of the filters, you always have all the star's light available for guiding. Next, by integrating the Off-Axis Guider into the camera, QSI is able to place the pick-off prism very close to the internal filter wheel adding minimal backfocus and eliminating any possibility of flexure or rotation compared to a traditional OAG. Third, the close placement of the pick-off prism prevents vignetting on the main sensor even with fast optical systems.
The 532wsg has high sensitivity, exceptionally low noise and precisely regulated cooling. The 532 camera system is supported by industry leading image acquisition software. Development tools are available for creating custom Windows or Linux imaging applications.