Hi David, > Date: Mon, 28 Jan 2008 11:09:28 -0800 > From: David Young <dsy@xxxxxxxxxxxxxxx> > > All: > > I keep examining old shots, looking for the now infamous "blue dot" > or, more properly "Blue Smudge". > > I have found about a dozen shots (which, out of 10,000+ is not a big > number, but it is still annoying. > > What I have determined is that, for me, it only occurs with the > 80~200/4 Vario. > > I get it (a) with filter, (b) with close-up lens (either Nikon or > Elpro achromats) or (c) no filter. Always dead center of the frame, > and always blue. > > Examination of the shots shows that it never happens in bright > sunlight ... only with heavy overcast, or indoors, in the shade! > Common to both of your examples is a diffused bright white background. Is this the same with the other "blue dot" shots that you have? If so, it would be interesting to see if you could get a blue dot when using a UV filter. Beyond that, I think you have "ironed down" the nature of the problem and can avoid it in the future. Best regards, Neil ------ Unsubscribe or change to/from Digest Mode at: http://www.lrflex.furnfeather.net/ Archives are at: //www.freelists.org/archives/leicareflex/