Assertion: eyepiece | /r/HasAspect | the orientation
Facets:
value: in a cassegrain-like system
type: OTHER
Source sentences:
text: Thus, assuming flat objective's image field, eyepiece field curvature convex toward the eye is much preferred to the opposite shape (note that field curvature resulting from reversed raytracing has opposite sign of its actual field curvature, which is the case with distortion as well; in systems w/o reversing reflection, light travels from left to right, so the proper eyepiece orientation is with exit pupil on the right side; in a Cassegrain-like system, eyepiece will have the orientation shown, but the objective's field curvature will be reversed due to reflection).