Archived posting to the Leica Users Group, 1996/09/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]My experience is that lenses may suffer more flare at small apertures, not large ones. If the principal cause of flare is internal reflections, and these are more likely to come from metal than glass surfaces (due to modern coating techniques) then it follows that the conditions for flare are least at maximum aperture (when there is little or no intrusion by the iris) and most at small apertures. Certainly my 35 1.4 Summilux-M ASPH can give flare under certain circumstances at f/8 down, whereas I've never seen the phenomenon at f/1.4.