Blur Busters Forums

Take a picture with a fast shutter speed (1/640th worked best on my 100Hz display): you can actually catch the monitor between refreshes!!! It's totally black, but the monitor light is on.

1/60th (sorry for blur; new camera and haven't figured out all the settings!)


1/640th

ikjadoon wrote:Take a picture with a fast shutter speed (1/640th worked best on my 100Hz display): you can actually catch the monitor between refreshes!!! It's totally black, but the monitor light is on.

You got that correct!
Those are interesting camera behaviours with strobe backlights.

LightBoost default settings (100%) means the backlight is strobing about 2.4 milliseconds (1/400th of a second) 120 times per second. This means there's almost 7ms of blackness between each flash. That's approximately 1/150th of a second of blackness between each flash. So if your camera shutter is far faster than the 1/150sec setting, you may successfully capture these black moments -- just exactly as you did.

Another interesting exercise is to use the high speed video feature of your camera. If your camera has a 240fps or 480fps high speed feature (e.g. GoPro Hero3 (240fps), Casio EX-FC200S (1000fps), Casio EX-ZR200 (1000fps), EX-F1 (1000fps),Fuji HS10 (1000fps), Nikon1 J1 (1200fps), Nikon1 J2 (1200fps), Nikon1 V2 (1200fps). I now have the Casio EX-ZR200 which is slightly better than the EX-FC200 because it has a bigger lens. Both cameras cost less than $300 off Amazon, and are really convenient for capturing the performance of strobe backlights, or game engine input lag. Cheap high speed video is very low-resolution (postage stamp size) but it's perfectly fine for strobe backlight testing.

High speed video of LightBoost (high speed video of http://www.testufo.com/flicker)