The Baader's new RCC Off-Axis Guider (OAG) is matched specifically for the Baader RCC-I Coma Corrector and Digital SLR cameras. The guider's 36.5 mm body length sets the backfocus at the 91.5 mm nominal distance required for the RCC-I.
This OAG accepts 1.25" auto guiders and guiding eyepieces. The lower part of the body has a standard male T/T2 thread on one side (for camera attachment via a separate T ring) and a female T/T2 thread on the other (for attachment to the RCC Coma Corrector).
The RCC Off-Axis Guider incorporates convenient axial and radial guide star adjustment, without loosening the main camera connection. For axial guide star alignment, simply turn the small knurled thumbscrew in either direction to shift the guide star along the optical axis. For radial (side to side) adjustment, loosen the bottom knurled thumbscrew and rotate the body radically (140-degree range). Simple, precise and robust.
The off-axis prism is 9.35 mm wide. The inside tube is 38 mm in diameter. Depending on your adjustments, the prism will intrude into the light path by about 6-7 mm leaving a clear aperture of 31-32 mm.