Assertion: lens | /r/HasProperty | designed for smaller sensor
Facets:
Source sentences:
text: One is that since a lens designed for a smaller sensor need only project an image circle large enough to cover the small sensor, the lens itself can be smaller; it can therefore also be lighter and have lower materials costs, since the lens elements, made of relatively heavy and expensive optical glass, will be smaller than in a comparable full-frame lens.
text: This is done because lenses designed for smaller sensors can be physically smaller and lighter themselves.