使照相影像边缘渐趋模糊的一种装置-ttist

Vignetter \Vi*gnett"er\, n.
1. A device used by photographers in printing vignettes,
consisting of a screen of paper or glass with a central
aperture the edges of which become opaque by insensible
gradations.
[Webster 1913 Suppl.]

2. A maker of vignettes.
[Webster 1913 Suppl.]