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

Contrast ratio results for Brookstone pocket projector

Contrast ratio 42:1
Monitor model Brookstone pocket projector
Submitted 18 Mar 2024 10:25 CET, by 73.140.*.*
Camera model samsung SM-S908U
Processing remarks

Note: image file 1: suggested exposure time: 1/7 s (Set EV to -0.2)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 2: suggested exposure time: 1/130 s (Set EV to -0.4)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.45 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –0.61 stops   (aim for –2 to –3)
Exposure spread 0.05 stops
Area used for calculation 0.332 x 0.332
Camera settings Exposure time: 0.5   ISO: 800   F-number: 1.8
Focal length: 23 mm   (35 mm equivalent)
Exposure compensation: 1.7
White
Screen photo
[open image]
Luminance 19 cd/m2
Luminance spread 1 cd/m2 (2 standard deviations)
Exposure value –1.43 stops   (aim for –2 to –3)
Exposure spread 0.06 stops
Area used for calculation 0.332 x 0.332
Camera settings Exposure time: 1/60   ISO: 320   F-number: 1.8
Focal length: 23 mm   (35 mm equivalent)
Exposure compensation: 0.7

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.