Greer Garson's blurry close-ups
I wondered what was used to create the blurry or foggy quality of Ms. Garson's close-ups in this movie. It was very noticeable that there was some sort of "vaseline lens" and I surmised it was to cover for signs of her age—at 41 she probably had a few lines, but she was playing a romantic lead alongside Gregory Peck (looking heavenly) in his twenties.
Does anyone know how this effect was achieved or have any anecdotes about the age difference in this movie?