Archived posting to the Leica Users Group, 2001/12/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]It's actually not vignetting. It's light falloff which is a natural (and calculable) phenomena. For large format wide angle lenses, they make "center filters" which even out the image density. Unfortunately, your 19/2.8 does not have filter threads. For a symmetrical design wide angle, light falloff is inevitable due to the inverse square law. The relative distance light has to travel to reach the corner of the negative is much greater than it is to the negative's center. Every time you increase distance to film plane by 50%, you loose a stop. The 19/2.8 is not a symmetrical lens therefore calculations will be a little different. But the theory applies. 3-D subjects (people, places, & things) don't show this phenomenon. Landscapes can be enhanced by this. But when photographing uniform subjects (plain wall, etc.) this phenomenon can be ugly. Jim At 11:12 PM 12/7/2001 -0800, Martin Krieger wrote: >Has anyone experienced vignetting with the "new" 19/2.8R Elmarit? On my >first roll with a non-ROM version I seem to have vignetting. It was taken >indoors and probably mostly at 2.8 or 4. >Martin Krieger >krieger@usc.edu - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html