Archived posting to the Leica Users Group, 2005/01/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I've had this, too, with a Summicron 50 tab version. No filter, lens cap was on, one roll of negatives, all shot on low speed (1/4th), at apertures ranging from f:2 to f:5.6. IMO it's plain lens flare: at the smaller apertures, you actually start to see the iris leafs. --- > From: "joe weil" <weiljr@earthlink.net> > Reply-To: Leica Users Group <lug@leica-users.org> > Date: Sat, 15 Jan 2005 17:51:10 -0800 > To: "Leica Users Group" <lug@leica-users.org> > Subject: [Leica] A little help please > > Hello, > I am hoping that greater knowledge of this group will give me some insight > to what I noticed on my negatives (Tri-X, shot at 400). I was shooting at > night with an R-8 and an older Summicron R 90 (Canada, # 2,463,XXX). In the > negatives shot with this lens, I noticed a secondary image of a bright > light source (a streetlight) in the negative as well. The street light was > positioned in the lower right hand corner of the negative and the secondary > reflection was located in the upper left corner so it seems to be symetric > about both the x and y axis. The secondary reflection was obviously > stronger as exposure time was increased. I spot metered off the street > light, opened up 2 stops and bracketed a couple stops in both directions. I > believe the aperture was somewhere between 2 and 4 and was constant when > the exposures were taken. There was a Hoya 81A filter in front of the lens > during the exposures. > I checked the lens and filter to see if they were clean and there was > nothing obvious on either. > > What would cause this secondary reflection, the lens, the filter or both? > Has anyone else experienced this phenomena? > I am planning an experiment to shoot with this lens at night with a single > bright light source at a small, medium and large aperture, with and without > the filter. Metering would be performed the same as I did above with an > obvious slant toward overexposure. > If you have any other ideas of things that I could try to figure it out, > please let me know. > Thanks > Joe > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >