Archived posting to the Leica Users Group, 2001/09/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I have had some 20x enlargements made of NPS negatives taken with the PC Super-Angulon R 28mm. There is clearly some chromatic aberration (objects with green edges on one side, red on other). Is this likely due to the lens, or to the enlarging lens? I cannot recall the f-stop I used, but I suspect it was more likely to be wider open than closed down. (People tell me that f-stop does not affect chromatic aberration.) [At reasonable viewing distance the 20x30 inch prints look quite good, but close up the image is sort-of mushy. It is hard to see the grain, even with a loupe.] Martin Krieger krieger@usc.edu