Optec - Equuleus Orthogonal (Tip-Tilt) Adjuster
The original Equuleus Orthogonal Adjusting Device (OAD) was designed to provide a simple method for aligning a camera imaging plane perpendicular to a telescope's optical axis. Images from cameras which are not perfectly orthogonal to the optical axis will display out-of-round stars in one or more corners. If the non-orthogonality is severe enough, inside-focus and outside-focus optical aberrations may begin to appear on opposite sides of the images.
Most camera manufacturers provide either a fixed factory adjustment or provide a user adjustment to ensure the camera's mechanical interface is parallel to the imaging sensor. However, the addition of filters wheels, camera rotators, off-axis guiders, and focusers to the imaging train will nearly always introduce even more non-orthogonal mis-alignment or sag to degrade the final image. Adjusting the camera to re-align the sensor will usually require removing the camera to tweak a small screw or worse, add shims, to the camera faceplate.
The basic design for the Equuleus OAD is a pair of parallel plates with robust spring tensioning, locating screws, and side-mounted adjustment cams. Collimation is accomplished by loosening the locking nuts and making very slight adjustments to the cam shaft mechanisms. Collimating in the Z-axis is similar to the typical X-Y collimation performed on telescopes. Three adjustment screws work against each other and the spring tension to provide a slight tip/tilt between the two plates. After adjustments are completed in real-time using live images, the adjustment camshaft mechanisms are locked into place.
- Outside Diameter: 5.25" (133mm)
- Nominal Thickness: 0.50" (12.7mm)
- Clear Aperture: 2.95" (75.0mm)
- Weight: 9.2 oz. (260 g)
- Back-focus Usage: 0.50" (12.7mm)
- Camera Payload Capacity: 5 lbs. (2.3kg)
- Maximum Deflection/Adjustment: 2mm *
- Maximum Tilt adjustment: 1-1/2 degrees
*Measured corner to corner on 50mm diagonal CCD imaging plane.
- 3"x24tpi female thread, both sides.