Assertion: eyepiece's design | /r/HasProperty | sharp
Facets:
value: to the edge
type: OTHER
value: in fast scopes
type: OTHER
Source sentences:
text: If you have a fast focal ratio scope, you basically have three choices: (1) pay the price for premium wide-field eyepieces; (2) limit yourself to Plössls and similar older designs, which have narrower apparent fields but are sharp to the edge even in fast scopes; or (3) buy inexpensive wide-field eyepieces and resign yourself to very poor edge performance.