Celestron CPC DELUXE 1100 HD, Instruction Manual

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The Celestron EdgeHD 19
The 11-inch EdgeHD is optimized to produce its sharpest
images in green and red; at these wavelengths it is diffraction-
limited over roughly two-thirds of the full 42mm image circle.
The relative illumination remains 100% across the central
16mm, then falls slowly to 83% at the very edge of a 42mm
image circle.
For pictorial images with an APS-C digital SLR camera, flats are
unnecessary. For monochrome imaging with an astronomical
CCD camera, we always recommend making flat-field images.
On nights when the seeing achieves 1.5 arcseconds FWHM,
star images shrink to 18μm at the focal plane. On such nights,
the EdgeHD 1100 delivers fine images over a 30mm image
circle, and well-defined stars over the full 42mm field.
The EdgeHD 1100 is a serious telescope. Its long focal length
and large image scale give it the ability to capture stunning
wide-field images of deep-sky objects with a large-format
CCD camera.
Celestron EdgeHD 1100