Converting your GSO Single Speed Crayford Focuser to 1:10 Dual Speed
This conversion kit allows you to easily convert your single speed Crayford focuser on your GSO scope into a precision 1:10 micro dual speed Crayford focuser. If your scope has a reasonably fast focal ratio, say f/7 or lower, the depth of critical focus is extremely shallow and becomes even shorter for very fast focal ratios. Although the single speed Crayford focuser allows you to achieve critical focus for visual applications, it may not be precise enough to achieve perfect pin-point focus for imaging applications.