Important historical events in high-speed image-tube photography are briefly high highlighted. The unique recording properties of image-tube diagnostics are be once more emphasized. As an example, some recent results on streak tubes application for femtosecond laser spark investigation are presented. It is concluded that the time-depending focusing of photoelectron images is the only way to overcome femtosecond time resolution limit. The present trends in ultrafast image-tube studies are considered in their connection with development of subfemtosecond photoelectron beam sources intended for femto-attosecond photoelectron diffractometry.