Assertion: microscope's objective | /r/HasProperty | usual
Facets:
Source sentences:
text: Some reflected light objectives are designed to focus at a longer working distance from the specimen than is usual; such objectives are labeled on the barrel of the objective as LWD (long working distance) or ULWD (ultra-long working distance).
text: Many reflected light objectives are designed to focus at a longer working distance from the specimen than is usual (see below).