Archived posting to the Leica Users Group, 2005/01/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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