Contrast ratio | 121:1 |
---|---|
Monitor model | |
Submitted | 13 Feb 2013 02:53 CET, by 190.176.*.* |
Camera model | Canon EOS REBEL T1i |
Processing remarks | image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. |
Black | |
Screen photo |
|
Luminance | 0.99 cd/m2 |
Luminance spread | 1.5 cd/m2 (2 standard deviations) |
Exposure value | –2.51 stops (aim for –2 to –3) |
Exposure spread | 2.84 stops |
Area used for calculation | 0.75 x 0.844 |
Camera settings | Exposure time: 0.8 ISO: 400 F-number: 4.6 Focal length: 54 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 121 cd/m2 |
Luminance spread | 85 cd/m2 (2 standard deviations) |
Exposure value | –2.89 stops (aim for –2 to –3) |
Exposure spread | 1.06 stops |
Area used for calculation | 0.75 x 0.844 |
Camera settings | Exposure time: 1/197 ISO: 400 F-number: 4.6 Focal length: 54 mm (35 mm equivalent) Exposure compensation: 0 |
Black at screen edge | |
Screen photo |
|
Luminance | 49 cd/m2 |
Luminance spread | 93 cd/m2 (2 standard deviations) |
Exposure value | –1.21 stops (aim for –2 to –3) |
Exposure spread | 4.25 stops |
Area used for calculation | 0.397 x 0.447 |
Camera settings | Exposure time: 1/25 ISO: 400 F-number: 4.6 Focal length: 28.6 mm (35 mm equivalent) Exposure compensation: 0 |
The luminance values in cd/m2 are not very reliable, since camera sensitivities can easily differ up to 50% from their nominal value. Typically, the real luminance is 30% lower than this number. The area used for calculation is chosen such that it corresponds to a viewing angle of ±14° horizontally and ±10.5° vertically, which is equivalent to viewing the screen from a distance of about 1.5 times the diagonal size.
Unfortunately, there is a lot of variation in how cameras use EXIF settings. If photos from your camera your produce unusable results, try coming back in a few days. I review submitted pictures regularly and try to fix problems.