T2 (T-mount) M42 x 0.75mm spacer, 8mm long.
Use this spacer to insure both imaging and guider cameras are parfocal (both cameras are in focus), or to extend the total back focus.
ONAG SC: Can be used at any of the three optical ports, scope port (SP), imager port (IP), and guider sport (GP)
ONAG XT: Can be used only on the guider port (GP)
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