Schneider Optics PC-SUPER-ANGULON 28 mm f/2.8 - Manual (Page 7)

 Perspective Correction for Analog and Digital Photography
Too
low
Too
wide
8 3 1 0,7 0,5 0,4 0,35
m
oo 5,6
11
4
16
2,8
22 22
48
4 8
16
16
22 5 3
2 1,5 1,25
Horizon
Optical axis
Building is true to scale and
completely reproduced
Vertical lines
are parallel
Vertical shift
of 7 mm
es the sharpness, produces just visible bluish violet or reddish brown color
fringes at edges which have been made perpendicular under fairly high en-
largement and gives an image with incorrect proportions (width-to-height
ratio) . Since the final image must, however, be rectangular, the triangular ar-
eas projecting on two sides have to be cut off, which shows how many pix-
els, which are important for high resolution, are lost . At the same time, the
surroundings almost always become very small at the narrow side of the
trapezoid or the actual motif is even cropped . The optical equalization ac-
tually during the shot with the PC-SUPER-Angulon 28 mm f/2 .8 avoids this .