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Equuleus Orthogonal Adjuster

Discontinued - Product no longer available for purchase.

#19380 - Equuleus Tip-Tilt Adjusting Device

Equuleus OADThe 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 camera must be re-installed and tested all over again.

Introducing the Equuleus:

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.

Equuleus OAG InstructionsThe Equuleus OAD is shipped with the cam shaft mechanism pre-adjusted so that the plates are parallel within 0.001". The adjustment mechanism is easily accessible from the sides so all adjustments can be performed while imaging. Adjustment is achieved using the supplied 5/64" Allen drive tool to rotate the cam shaft assemblies. First, slightly loosen the locking nut using the supplied 5/16" hex nut driver. Keep some tension on the locking nut - a Belleville washer below the nut will allow the shaft to remain somewhat stiff so that precise adjustments are easier. A very small amount of adjustment is all that is required. One full turn of the cam shaft will provide all the adjustment that cam shaft is capable of, so start with very small adjustments - 1/20th turn may be all that is needed. The T-handle 5/64" drive tool will make the adjustment amount easier to keep track of and provide a visual clue to the amount of adjustment performed. Review your changes in real-time using CCD Inspector or your favorite image analysis software until the tilt angle has been reduced to zero. Finally, tighten the locking nuts and you're done.

Technical Specifications:

* Measured corner to corner on 50mm diagonal CCD imaging plane.

Mechanical Interface:

Recommended Adapters:

#17666  2-inch to 3x24tpi nosepiece.
#17832  3-inch to 3x24tpi nosepiece.
#19370  3x24tpi  to 3x24tpi (male-male) adapter.
#19371  3x24tpi to T-thread adapter.
#19372  3x24tpi to SBIG STL (2.156x24tpi) male threaded adapter.

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