>> some solved it with graduated filters but I always thought the >> more ingenious solution was the whirling propeller in front of lens idea! > >That is a clever idea and one size propeller would work on all your lenses as >long as it was big enough. Was it ever actually used? As far as I know it was indeed used. But I do not remember the company that produced it. Maybe Zeiss? Maybe it was only used in aerial cameras?? Maybe Voigtlander? Anyway, one of those "noble" or notable optics companies! andy
