Assertion: eyepiece's field | /r/HasProperty | unsuitable
Facets:
value: for wide field photographic work
type: PURPOSE
Source sentences:
text: However, the Dall Kirkham has coma that is about 2 to 6 times that in a classic Cassegrain and a small field that is unsuitable for wide field photographic work; the image quality deteriorates significantly as secondary magnification increases.