Lens Vignetting Tests

Contents

Flat field test

Procedure

Summary of results

Pentax DA 18-250
18mm
Upper-left clean: f/8
Upper-right clean: f/11-f/16
Remarks: darker towards right/down
21mm
Upper-left clean: f/5.6
Upper-right clean: f/8-f/11
Remarks: darker towards right/down
30mm
Upper-left clean: f/8-f/11
Upper-right clean: never, really – even at f/22 there is a tiny but noticable dark fleck
Remarks: darker towards right; falloff extremely sharp
50mm
Upper-left clean: f/8-f/11
Upper-right clean: f/22
Remarks: darker towards right
70mm
Upper-left clean: f/11
Upper-right clean: never
Remarks: darker towards right
125mm
Upper-left clean: f/11-f/16
Upper-right clean: f/22
Remarks: darker towards right
250mm
Upper-left clean: f/8
Upper-right clean: f/16
Remarks: darker towards right/top; falloff much softer than other FLs

Images

Click on images for 800-pixel version.

The multicolored ring images are maps of light falloff. Each color band is 3.3% more falloff; e.g., the pink band starts when the images is 96.6% as luminous as the center, the brown band at 93.3%, etc.

Pentax DA 18-250 Falloff Map
18mm
f/3.5
[ff/3541.18f3_5.png]

full size (368k)

[ff/3541.18f3_5.lum.png]

full size (57k)

f/4
[ff/3542.18f4.png]

full size (368k)

[ff/3542.18f4.lum.png]

full size (51k)

f/4.5
[ff/3543.18f4_5.png]

full size (374k)

[ff/3543.18f4_5.lum.png]

full size (53k)

f/5.6
[ff/3544.18f5_6.png]

full size (370k)

[ff/3544.18f5_6.lum.png]

full size (47k)

f/6.7
[ff/3545.18f6_7.png]

full size (372k)

[ff/3545.18f6_7.lum.png]

full size (47k)

f/8
[ff/3546.18f8.png]

full size (375k)

[ff/3546.18f8.lum.png]

full size (50k)

f/11
[ff/3547.18f11.png]

full size (375k)

[ff/3547.18f11.lum.png]

full size (49k)

f/16
[ff/3548.18f16.png]

full size (374k)

[ff/3548.18f16.lum.png]

full size (56k)

f/22
[ff/3549.18f22.png]

full size (378k)

[ff/3549.18f22.lum.png]

full size (57k)

21mm
f/3.5
[ff/3550.21_88f3_5.png]

full size (373k)

[ff/3550.21_88f3_5.lum.png]

full size (55k)

f/4
[ff/3551.21_88f4.png]

full size (366k)

[ff/3551.21_88f4.lum.png]

full size (48k)

f/4.5
[ff/3552.21_88f4_5.png]

full size (375k)

[ff/3552.21_88f4_5.lum.png]

full size (48k)

f/5.6
[ff/3553.21_88f5_6.png]

full size (367k)

[ff/3553.21_88f5_6.lum.png]

full size (45k)

f/6.7
[ff/3554.21_88f6_7.png]

full size (375k)

[ff/3554.21_88f6_7.lum.png]

full size (47k)

f/8
[ff/3555.21_88f8.png]

full size (376k)

[ff/3555.21_88f8.lum.png]

full size (52k)

f/11
[ff/3556.21_88f11.png]

full size (376k)

[ff/3556.21_88f11.lum.png]

full size (48k)

f/16
[ff/3557.21_88f16.png]

full size (378k)

[ff/3557.21_88f16.lum.png]

full size (49k)

f/22
[ff/3558.21_88f22.png]

full size (379k)

[ff/3558.21_88f22.lum.png]

full size (52k)

30mm
f/4
[ff/3559.29_38f4.png]

full size (374k)

[ff/3559.29_38f4.lum.png]

full size (50k)

f/4.5
[ff/3560.29_38f4_5.png]

full size (370k)

[ff/3560.29_38f4_5.lum.png]

full size (45k)

f/5.6
[ff/3561.29_38f5_6.png]

full size (376k)

[ff/3561.29_38f5_6.lum.png]

full size (49k)

f/6.7
[ff/3562.29_38f6_7.png]

full size (374k)

[ff/3562.29_38f6_7.lum.png]

full size (46k)

f/8
[ff/3563.29_38f8.png]

full size (377k)

[ff/3563.29_38f8.lum.png]

full size (46k)

f/11
[ff/3564.29_38f11.png]

full size (375k)

[ff/3564.29_38f11.lum.png]

full size (56k)

f/16
[ff/3565.29_38f16.png]

full size (376k)

[ff/3565.29_38f16.lum.png]

full size (48k)

f/22
[ff/3566.29_38f22.png]

full size (380k)

[ff/3566.29_38f22.lum.png]

full size (53k)

50mm
f/4.5
[ff/3567.50f4_5.png]

full size (375k)

[ff/3567.50f4_5.lum.png]

full size (49k)

f/5.6
[ff/3568.50f5_6.png]

full size (375k)

[ff/3568.50f5_6.lum.png]

full size (42k)

f/6.7
[ff/3569.50f6_7.png]

full size (378k)

[ff/3569.50f6_7.lum.png]

full size (41k)

f/8
[ff/3570.50f8.png]

full size (377k)

[ff/3570.50f8.lum.png]

full size (38k)

f/11
[ff/3571.50f11.png]

full size (376k)

[ff/3571.50f11.lum.png]

full size (38k)

f/16
[ff/3572.50f16.png]

full size (377k)

[ff/3572.50f16.lum.png]

full size (44k)

f/22
[ff/3573.50f22.png]

full size (382k)

[ff/3573.50f22.lum.png]

full size (45k)

70mm
f/5.6
[ff/3574.70f5_6.png]

full size (374k)

[ff/3574.70f5_6.lum.png]

full size (44k)

f/6.7
[ff/3575.70f6_7.png]

full size (371k)

[ff/3575.70f6_7.lum.png]

full size (34k)

f/8
[ff/3576.70f8.png]

full size (375k)

[ff/3576.70f8.lum.png]

full size (35k)

f/11
[ff/3577.70f11.png]

full size (375k)

[ff/3577.70f11.lum.png]

full size (34k)

f/16
[ff/3578.70f16.png]

full size (380k)

[ff/3578.70f16.lum.png]

full size (39k)

f/22
[ff/3579.70f22.png]

full size (384k)

[ff/3579.70f22.lum.png]

full size (40k)

125mm
f/5.6
[ff/3580.120f5_6.png]

full size (374k)

[ff/3580.120f5_6.lum.png]

full size (42k)

f/6.7
[ff/3581.120f6_7.png]

full size (365k)

[ff/3581.120f6_7.lum.png]

full size (33k)

f/8
[ff/3582.120f8.png]

full size (377k)

[ff/3582.120f8.lum.png]

full size (28k)

f/11
[ff/3583.120f11.png]

full size (366k)

[ff/3583.120f11.lum.png]

full size (20k)

f/16
[ff/3584.120f16.png]

full size (377k)

[ff/3584.120f16.lum.png]

full size (29k)

f/22
[ff/3585.120f22.png]

full size (384k)

[ff/3585.120f22.lum.png]

full size (27k)

250mm
f/6.7
[ff/3586.250f6_7.png]

full size (372k)

[ff/3586.250f6_7.lum.png]

full size (58k)

f/8
[ff/3587.250f8.png]

full size (367k)

[ff/3587.250f8.lum.png]

full size (46k)

f/11
[ff/3588.250f11.png]

full size (364k)

[ff/3588.250f11.lum.png]

full size (27k)

f/16
[ff/3589.250f16.png]

full size (377k)

[ff/3589.250f16.lum.png]

full size (18k)

f/22
[ff/3590.250f22.png]

full size (386k)

[ff/3590.250f22.lum.png]

full size (17k)

Blue-sky test

Procedure

Summary of results

Pentax DA 18-55 Sigma 18-125 Pentax DA 18-250 Sigma 17-70
17/18mm
Upper-left clean: never f/11 f/5.6? f/4.5
Upper-right clean: never never f/6.7? f/8?
Remarks: UL seems slightly better UL seems slightly better UL seems slightly better
21mm
Upper-left clean: f/11 f/5.6 f/4.5 f/4
Upper-right clean: f/11 f/6.7? f/8 f/4
Remarks: UL slightly better?
30mm
Upper-left clean: f/5.6 f/4.5 f/8 f/3.5
Upper-right clean: f/5.6 f/5.6 f/16? f/3.5
Remarks: UL slightly better nasty below f/6.7 UL slightly better
50mm
Upper-left clean: f/6.7 f/5.6 f/6.7? f/8
Upper-right clean: f/6.7?? f/6.7 f/8? f/8
Remarks: UL slightly better UL slightly better?
70mm
Upper-left clean: f/8 f/11 f/8?
Upper-right clean: f/11 f/16 f/8?
Remarks:
125mm
Upper-left clean: f/11? f/16
Upper-right clean: f/16? f/16?
Remarks: UL noticeably better
250mm
Upper-left clean: f/16
Upper-right clean: f/16
Remarks: L noticeably better

Images

Click on images for 800-pixel version.

Pentax DA 18-55 Sigma 18-125 Pentax DA 18-250 Sigma 17-70
17/18mm
f/2.8
[im/2029.17f2_8.jpg]

full size (150k)

f/3.5
[im/2002.18f3_5.jpg]

full size (152k)

[im/1920.18f3_5.jpg]

full size (162k)

[im/1958.18f3_5.jpg]

full size (157k)

[im/2030.17f3_5.jpg]

full size (148k)

f/4
[im/2003.18f4.jpg]

full size (154k)

[im/1921.18f4.jpg]

full size (166k)

[im/1959.18f4.jpg]

full size (156k)

[im/2031.17f4.jpg]

full size (153k)

f/4.5
[im/2004.18f4_5.jpg]

full size (160k)

[im/1922.18f4_5.jpg]

full size (168k)

[im/1960.18f4_5.jpg]

full size (164k)

[im/2032.17f4_5.jpg]

full size (157k)

f/5.6
[im/2005.18f5_6.jpg]

full size (163k)

[im/1923.18f5_6.jpg]

full size (173k)

[im/1961.18f5_6.jpg]

full size (161k)

[im/2033.17f5_6.jpg]

full size (158k)

f/6.7
[im/2006.18f6_7.jpg]

full size (164k)

[im/1924.18f6_7.jpg]

full size (173k)

[im/1962.18f6_7.jpg]

full size (164k)

[im/2034.17f6_7.jpg]

full size (159k)

f/8
[im/2007.18f8.jpg]

full size (165k)

[im/1925.18f8.jpg]

full size (174k)

[im/1963.18f8.jpg]

full size (164k)

[im/2035.17f8.jpg]

full size (160k)

f/11
[im/2008.18f11.jpg]

full size (164k)

[im/1926.18f11.jpg]

full size (168k)

[im/1964.18f11.jpg]

full size (162k)

[im/2036.17f11.jpg]

full size (159k)

f/16
[im/2009.18f16.jpg]

full size (160k)

[im/1927.18f16.jpg]

full size (163k)

[im/1965.18f16.jpg]

full size (159k)

[im/2037.17f16.jpg]

full size (156k)

21mm
f/2.8
[im/2038.21f2_8.jpg]

full size (152k)

f/3.5
[im/1966.21_88f3_5.jpg]

full size (153k)

[im/2039.21f3_5.jpg]

full size (151k)

f/4
[im/2010.21f4.jpg]

full size (152k)

[im/1928.21f4.jpg]

full size (164k)

[im/1967.21_88f4.jpg]

full size (155k)

[im/2040.21f4.jpg]

full size (155k)

f/4.5
[im/2011.21f4_5.jpg]

full size (159k)

[im/1929.21f4_5.jpg]

full size (167k)

[im/1968.21_88f4_5.jpg]

full size (162k)

[im/2041.21f4_5.jpg]

full size (158k)

f/5.6
[im/2012.21f5_6.jpg]

full size (161k)

[im/1930.21f5_6.jpg]

full size (169k)

[im/1969.21_88f5_6.jpg]

full size (161k)

[im/2042.21f5_6.jpg]

full size (160k)

f/6.7
[im/2013.21f6_7.jpg]

full size (164k)

[im/1931.21f6_7.jpg]

full size (169k)

[im/1970.21_88f6_7.jpg]

full size (163k)

[im/2043.21f6_7.jpg]

full size (160k)

f/8
[im/2014.21f8.jpg]

full size (163k)

[im/1932.21f8.jpg]

full size (170k)

[im/1971.21_88f8.jpg]

full size (163k)

[im/2044.21f8.jpg]

full size (161k)

f/11
[im/2015.21f11.jpg]

full size (163k)

[im/1933.21f11.jpg]

full size (169k)

[im/1972.21_88f11.jpg]

full size (162k)

[im/2045.21f11.jpg]

full size (161k)

f/16
[im/2016.21f16.jpg]

full size (159k)

[im/1934.21f16.jpg]

full size (165k)

[im/1973.21_88f16.jpg]

full size (158k)

[im/2046.21f16.jpg]

full size (158k)

30mm
f/3.5
[im/2047.31f3_5.jpg]

full size (166k)

f/4
[im/2017.31f4.jpg]

full size (160k)

[im/1935.30f4.jpg]

full size (177k)

[im/1974.29_38f4.jpg]

full size (165k)

[im/2048.31f4.jpg]

full size (163k)

f/4.5
[im/2018.31f4_5.jpg]

full size (166k)

[im/1936.30f4_5.jpg]

full size (176k)

[im/1975.29_38f4_5.jpg]

full size (167k)

[im/2049.31f4_5.jpg]

full size (168k)

f/5.6
[im/2019.31f5_6.jpg]

full size (171k)

[im/1937.30f5_6.jpg]

full size (179k)

[im/1976.29_38f5_6.jpg]

full size (173k)

[im/2050.31f5_6.jpg]

full size (171k)

f/6.7
[im/2020.31f6_7.jpg]

full size (173k)

[im/1938.30f6_7.jpg]

full size (180k)

[im/1977.29_38f6_7.jpg]

full size (173k)

[im/2051.31f6_7.jpg]

full size (173k)

f/8
[im/2021.31f8.jpg]

full size (173k)

[im/1939.30f8.jpg]

full size (179k)

[im/1978.29_38f8.jpg]

full size (173k)

[im/2052.31f8.jpg]

full size (173k)

f/11
[im/2022.31f11.jpg]

full size (170k)

[im/1940.30f11.jpg]

full size (176k)

[im/1979.29_38f11.jpg]

full size (172k)

[im/2053.31f11.jpg]

full size (173k)

f/16
[im/2023.31f16.jpg]

full size (167k)

[im/1941.30f16.jpg]

full size (171k)

[im/1980.29_38f16.jpg]

full size (168k)

[im/2054.31f16.jpg]

full size (169k)

50mm
f/4
[im/2055.53f4.jpg]

full size (181k)

f/4.5
[im/1942.50f4_5.jpg]

full size (186k)

[im/1981.50f4_5.jpg]

full size (176k)

[im/2056.53f4_5.jpg]

full size (181k)

f/5.6
[im/2024.50f5_6.jpg]

full size (179k)

[im/1943.50f5_6.jpg]

full size (188k)

[im/1982.50f5_6.jpg]

full size (177k)

[im/2057.53f5_6.jpg]

full size (186k)

f/6.7
[im/2025.50f6_7.jpg]

full size (181k)

[im/1944.50f6_7.jpg]

full size (188k)

[im/1983.50f6_7.jpg]

full size (186k)

[im/2058.53f6_7.jpg]

full size (187k)

f/8
[im/2026.50f8.jpg]

full size (182k)

[im/1945.50f8.jpg]

full size (188k)

[im/1984.50f8.jpg]

full size (186k)

[im/2059.53f8.jpg]

full size (189k)

f/11
[im/2027.50f11.jpg]

full size (182k)

[im/1946.50f11.jpg]

full size (185k)

[im/1986.50f11.jpg]

full size (184k)

[im/2060.53f11.jpg]

full size (186k)

f/16
[im/2028.50f16.jpg]

full size (178k)

[im/1947.50f16.jpg]

full size (180k)

[im/1987.50f16.jpg]

full size (179k)

[im/2061.53f16.jpg]

full size (182k)

70mm
f/4.5
[im/2062.70f4_5.jpg]

full size (182k)

f/5.6
[im/1948.68f5_6.jpg]

full size (189k)

[im/1988.70f5_6.jpg]

full size (186k)

[im/2067.70f5_6.jpg]

full size (183k)

f/6.7
[im/1949.68f6_7.jpg]

full size (192k)

[im/1989.70f6_7.jpg]

full size (190k)

[im/2063.70f6_7.jpg]

full size (188k)

f/8
[im/1950.68f8.jpg]

full size (195k)

[im/1990.70f8.jpg]

full size (192k)

[im/2064.70f8.jpg]

full size (191k)

f/11
[im/1951.68f11.jpg]

full size (193k)

[im/1991.70f11.jpg]

full size (191k)

[im/2065.70f11.jpg]

full size (192k)

f/16
[im/1952.68f16.jpg]

full size (187k)

[im/1992.70f16.jpg]

full size (185k)

[im/2066.70f16.jpg]

full size (188k)

125mm
f/5.6
[im/1953.125f5_6.jpg]

full size (205k)

[im/1993.130f5_6.jpg]

full size (203k)

f/6.7
[im/1954.125f6_7.jpg]

full size (206k)

[im/1994.130f6_7.jpg]

full size (202k)

f/8
[im/1955.125f8.jpg]

full size (208k)

[im/1995.130f8.jpg]

full size (211k)

f/11
[im/1956.125f11.jpg]

full size (206k)

[im/1996.130f11.jpg]

full size (209k)

f/16
[im/1957.125f16.jpg]

full size (206k)

[im/1997.130f16.jpg]

full size (210k)

250mm
f/6.7
[im/1998.250f6_7.jpg]

full size (180k)

f/8
[im/1999.250f8.jpg]

full size (183k)

f/11
[im/2000.250f11.jpg]

full size (189k)

f/16
[im/2001.250f16.jpg]

full size (197k)