Hi all. Up till now I've been gaming on my trusty old CRT I bought in high school some 15 years ago. It is really starting to go on the fritz though so it's time for a fancy new HDTV. I recalled reading about input lag and HDTVs 5 years ago, and I was very surprised when starting my research this month to find that this is still a common problem among HDTVs. :-( These forums have really helped me get up to speed on the current state of HDTV technology and input lag. Thanks guys!
Anyways, the point of this post is that after reading about and seeing examples of the standard method of measuring input lag, I discovered a more precise method of measuring relative input lag. My camera, a Canon SD4000IS, has a "super slow motion" video mode, which records 320x240 video at 240fps. I imagine most cameras don't have this feature. But if you have one that does, you can use it to record, instead of photograph, the standard input lag test. At 240 fps, you are capturing one frame every 4.17 ms. Using video software that allows you to examine individual video frames, it is possible to closely compare how many frames of delay there are between your reference display, and the HDTV being tested, and then calculate the input lag as (number of frames * 4 ms). I was surprised to see that using this method my CRT was actually 4ms ahead of my laptop display when using a composite video out adapter.
I guess this isn't a whole lot of help when most cameras don't have this feature, but I will certainly be measuring using this method to measure the input lag when I get a new Panasonic plasma in the near future.
In other news, I measured a strange setup (Wii composite->USB TV tuner with composite in->Mac OS X ->eyeTV software->iMac screen) that I knew was unplayable for most games, and it came out to about 79ms of input lag, and I was shocked to find out that it is possible to find input lags even higher than this on modern HDTVs!