burning-in tool changing bag closeup lens darkroom developing tank diaphragm dodging tool dryer drying blotter easel electronic-flash unit enlarger exposure meter filter finder fisheye lens flash tube flashbulb flashcube flashgun flashlight gadget bag incident light meter lens lens cover lens hood light meter photoflash photoflash lamp photometer range finder reflector shutter stroboscopic light telephoto lens timer tripod varifocal lens viewfinder zoom lens