aid convex convex lens enlarged enlargement enlarging hand lens lens magnification magnified magnifyer magnifying glass Sherlock Holmes visual aid big bigger definition dictionary enlarge glass increase increased magnify view word apparatus black-and-white contact-proofs darkroom developed developing developing-tanks enlarger equipment film film-photography greyscale items materials miscellaneous-articles negative-strips negatives paraphernalia photo photography positive pre-digital proof-sheets proofs spools thermometer undeveloped enlargment magnifying sharp brass loupe magnifier optic optical antique brown handle Look old plastic abstract biology Capsella Capsella bursa-pasto embryo family Brassicaceae magification micro microscope mustard plant seed Shepherd's-purse