Video Aliasing Issues
The EOS 5D Mark II, 7D and 1D Mark IV (no word on the T1i) appear to be affected by the issue.
What's the deal?
“The article by Barry Green is about the oft-reported “aliasing” artifacts in video from the Canon HDSLRs (5D Mark II, 7D, 1D Mark IV). Barry does a great job of backing up a few steps and defining the term aliasing.
Aliasing occurs when you sample something infrequently enough that you create an impression of something that wasn’t there. Imagine a blinking light in a room with a door. You must open the door to check the status of the light. If you open the door often enough, you get a pretty good picture of the status of the light, maybe something like on, on on, off off off, on on on, etc. Your samples are frequent enough to accurately represent the light’s activity.”
Read all about it at Planet5D
cr
“The article by Barry Green is about the oft-reported “aliasing” artifacts in video from the Canon HDSLRs (5D Mark II, 7D, 1D Mark IV). Barry does a great job of backing up a few steps and defining the term aliasing.
Aliasing occurs when you sample something infrequently enough that you create an impression of something that wasn’t there. Imagine a blinking light in a room with a door. You must open the door to check the status of the light. If you open the door often enough, you get a pretty good picture of the status of the light, maybe something like on, on on, off off off, on on on, etc. Your samples are frequent enough to accurately represent the light’s activity.”
14 Comments
I need coffee before I even start thinking about WTF this is talking about, lol
I’m glad I’m not the only one. I’m only half way through my first Mt Dew and that pretty much blew my mind.
Look up Nyquist sampling… It makes for good reading if you’re having trouble getting to sleep.
Haha. I’ve got a t1i, the lowest quality DSLR with video. And I’ve got no anti-aliasing. Serves you right for having a better camera than me. Suckers!
OK, this is no big deal, it’s just a possible limitation of the cameras under certain conditions, not some big design flaw everyone has to start bashing the cameras over.
The article even starts out with:
“We’ve seen some discussions about it in the past and we haven’t experienced it ourselves.”
“Let’s be cautious about blowing this all out of proportion tho – there are thousands upon thousands of movies being made with these hybrid DSLRs with no problems… and if you’re aware of some of the limitations of the camera as you use it, then you’ll be a lot better off. I see some of the comments posted in Stu’s blog indicating that the sky is falling and video on these cameras is trash, but we all know that isn’t true… so let’s take this information and be better filmmakers with our cameras ok?”
Everything has limits. They still make awesome video though.