Abstract: The invention is generally accomplished by a method of sensitizing comprising providing tabular silver bromoiodide grains or bromoiodide grains doped with Se and Iridium bringing said grains into contact with a benzothiazolium salt or hydrolyzed benzothiazolium salt comprising ##STR1## wherein R.sub.1 is hydrogen, alkyl of from 1 to 8 carbon atoms, or aryl of from 6 to 10 carbon atoms,R.sub.4 and R.sub.5 are independently hydrogen or halogen atoms, aliphatic or aromatic hydrocarbon moieties optionally linked through a divalent oxygen or sulfur atom; or cyano, amino, amido, sulfonamido, sulfamoyl, ureido, thioureido, hydroxy, --C(O)M, or --S(0).sub.2 M groups, wherein M is chosen to complete an aldehyde, ketone, acid, ester, thioester, amide, or salt;Y.sub.1 is a charge balancing counter ion; andQ is a substituent of the formula:--LCONHS0.sub.2 R, --LCONHS0.sub.2 NHCOR alkyl, sulfoalkyl, phosphoalkyl, hydroxyalkyl, or L--CONH.sub.

Abstract: The invention is generally accomplished by a method of forming a silver halide emulsion in which digestion of nucleated silver halide grains is carried out in a halide solvent concentration of between about 0.0015 and about 0.015 normal. In a preferred embodiment the solvent utilized is ammonium hydroxide and grains of a thickness of between about 0.05 and 0.5 micron having an equivalent circular diameter of about 0.05 to about 2.0 microns are produced. It is also preferred that the grains be nucleated in a bromide solution having a bromide ion concentration of between 0.0075 and about 0.6 normal.