Assertion: eyepiece's field | /r/HasProperty | narrow
Facets:
value: very
type: DEGREE
Source sentences:
text: They have four elements and a 45-degree apparent field of view, which is somewhat narrow.
text: Some eyepieces have narrow apparent fields and some have wide apparent fields.
text: Wider apparent fields of view are helpful in viewing star clusters, galaxies and nebulae, especially large emission nebulae like the Orion Nebula, but the real reason for wide fields of view is to allow the same true field of view as is found in a lower power, narrower FOV eyepiece.
text: A high focal ratio also means the field of view will be narrow.
text: At the longer focal ratios, these eyepieces perform marginally well, although their field of view is very narrow.
text: When you use 4mm eyepiece, it has very narrow field and high power.