Contrast ratio | Test results | LCD test | Small-screen tests | Lagom home

Contrast ratio of Brookstone pocket projector

Contrast ratio 454:1
Monitor model Brookstone pocket projector
Submitted 18 Mar 2024 10:36 CET, by 73.140.*.*
Camera model samsung SM-S908U
Processing remarks

Note: image file 2: suggested exposure time: 1/85 s (Set EV to -0.5)

Black
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –2.91 stops   (aim for –2 to –3)
Exposure spread 0.18 stops
Area used for calculation 0.332 x 0.332
Camera settings Exposure time: 4   ISO: 200   F-number: 1.8
Focal length: 23 mm   (35 mm equivalent)
Exposure compensation: -0.7
White
Screen photo
[open image]
Luminance 21 cd/m2
Luminance spread 1 cd/m2 (2 standard deviations)
Exposure value –0.99 stops   (aim for –2 to –3)
Exposure spread 0.06 stops
Area used for calculation 0.332 x 0.332
Camera settings Exposure time: 1/30   ISO: 200   F-number: 1.8
Focal length: 23 mm   (35 mm equivalent)
Exposure compensation: 1

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.