Archived posting to the Leica Users Group, 1997/07/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 04:48 PM 27-07-97 -0700, Roger wrote: [snip] >Flare and coma are much better in the ASPH compared to the regular >Summilux. My biggest reason for owning it. You may well be right. Maybe it says something about the lighting conditions in which I primarily do my photography, but I have never considered either coma or flare to be a major problem with the standard 35/1.4 Summilux at f-stops 2 or below. The one time I encountered what appears to be really bad coma (or spherical aberation; I'm not sure how to distinguish the two) was when I photographed the Northern Lights during a famous power outage in Quebec about 10 years ago. A nearby hospital had it's own power sources, and window lights showed significant asymetrical flaring. I was shooting at f1.4, though. I have noticed that point sources of light appear very sharp at f1.4 with the aspherical. One should be carefull when photographing point light sources to test for coma, etc. It is east to overexpose point light sources, in which case, it is possible for the focused light to "spread" a bit into the emulsion, giving the impression of some kind of optical aberation. Dan C.