Rectangular lenses are similar to regular singlet and doublet lenses, but they have a rectangular shape rather than a circular shape. They are used as magnifiers or odd-sized projection and reduction. These Rectangular lenses are used to reduce weight in some optical systems.
Experimental Quality Rectangular Lenses are offered in several experimental grade options. Grade 1 is standard optical glass, edged, free of visible scratches, chips, stains, or oxidation. Grade 2 is unedged, non-optical glass, small chips, slight stains, or other defects. They may have slight edge cement separation.
Note: Specifications for experimental grade optics may vary as much as 10% from those listed. Also, no additional information is available other than what is provided.