Atmospheric seeing is the driver for image resolution with a 1-m class telescope. It's been my experience that the seeing at Stony Ridge varies, on the average, from about 2-3 arc-seconds FWHM. There are probably better nights of 1 arc-second seeing, but these seem to occur on nights when the observatory is dark. ;>]

The first two images above were exposed about 25 minutes apart on a very breezy night. As illustrated, poor seeing can be quite variable and is especially damaging to faint objects. The third image in the series represents good conditions, limiting magnitude is fainter, star images are round, more of the starlight is concentrated in a smaller number of pixels.

- - SCB 2002/02/02

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