Assertion: eyepiece's field | /r/HasProperty | limited by its strong petzval curvature
Facets:
value: mainly
type: OTHER
Source sentences:
text: gives 0.24 waves RMS, corresponding to 0.8 wave P-V, which means it requires f /7 do drop below quarter wave p-v), but the spots reveal good color correction, and low off axis aberrations at 15 degrees; field is limited mainly by its strong Petzval curvature.