50-100
If the wedge deviation is 2 minutes and 30 seconds say, then the collimator should read the exact same angle, 2 min. and 30 sec. in image space. The best way to know the exact angle deviation of a prism wedge is to measure it with an autocollimator or theodolite. Let me know if you need help with this part, the procedure is straightforward. ................
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