Assertion: eyepiece | /r/HasAspect | short focal length
Facets:
Source sentences:
text: If an eyepiece has a short focal length, it can focus rays of light within a shorter distance from the lens.
text: Yes, with eyepieces having short focal lengths and very long eye reliefs (e.g. Radians, Pentax XWs, Vixen Lanthanum, Orion ED) or eyepieces with an unusual characteristic called "spherical aberration of the exit pupil" (TeleVue nagler Type 1s).