These are samples from Vivitar Series 1 90mm 1:2.5 VMC Macro lens and various Pentax digital SLR's
Vivitar Series 1 90 mm f/2.5 MacroVivitar 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 MacroVivitar Series 1 90 mm f/2.5 Macro