If the camera had a lot more on-board processing it could use the entire resolution of the sensor and then down sample (and sharpen) the output before recording it.

Some cameras have much less aliasing than these, but they cost a lot more (ten times or even hundreds of times more).

I’d call it a limitation of the technology brought about by the price point of the camera.

Either live with it or shell out an awful lot more for a better camera.

Still, I would expect future generations of cameras to improve.

http://prolost.com/blog/2009/12/3/you-didnt-believe-me.html
“So what does this have to do with Canon HDSLRs? The same thing it has to do with every digital camera. Every camera that uses photosites to create pixels has to deal with this venetian blind problem. There’s space between those photosites, and in that space you can miss out on important information about what was happening in front of the lens.”

So the T1i has the problem as do all video cameras. But their strengths are delivering impressive results with inter-changeable lenses at a (relatively) low pricepoint.

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.