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A couple of points of note
1. The actual available guide fov may be constrained more by the size of the guide chip than the size of the prism.
2. To minimise the "off-axis" coma type problems usually seen in some guide images the prism should be able to be tilted to better bring the optical axis to the centre of the guide camera. This is overlooked in some designs.
The old Meade OAG had a small tapered screw adjuster for the prism.
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