Assertion: focal ratio | /r/CapableOf | use focal reducer
Facets:
value: with a simple lens
type: OTHER
value: with a refractor
type: OTHER
value: on a given telescope
type: LOCATION
Source sentences:
text: Focal ratio also affects resolution, assuming a constant aperture (in other words, using a focal reducer on a given telescope) and thus affects SNR in the same way.
text: Focal ratios use this formula to calculate the resulting focal ratio when using a focal reducer with a refractor or a simple lens: