550d Zooming during movie

Started Feb 26, 2010 | Discussions thread
caterpillar Veteran Member • Posts: 7,637
it's the camera not the lens

AV Janus wrote:

But if you do use the zoom, does the camera automatically refocus the frame after you stop zooming or do you have to half-press the shutter or worse do it manually?

It would not matter if you were zooming or not. The camera's contrast detect (CD) AF is slow. When in video, if you choose to have it AF, you are like in Ai-servo. The camera will try to AF it. But CD is slow. You are better off, manually focusing.

As I also posted in this same thread, if your lens is parfocal, if you achieve focus on the long end, you will still be in focus if you zoom out. That is, if your lens is parfocal. If it isn't, then it will lose the initial focus. Trust me, though, you'll be worrying more than the zoom losing focus. You'll worry more on keeping your camera still and not rocking or moving the camera as you manually focus or zoom. You'll end up setting your shot well in the beginning as changing focus or zoom is going to be tricky when you are already recording.

There are focus puller/rings you can buy to make this less jarring and possible. You attach them to the lens focusing and zoom ring and then the process is smoother and maybe you can focus and zoom without the camera moving. This is added expense again. Then you will be thinking of a rig. Then a decent video tripod that pans smoothly (your photo tripod may not have a fluid head good for panning). Then you will be thinking of getting a stabilizer. Then you will find the LCD hard to look at at odd heights, so you will start looking at hoods or angled viewfinders or external LCD monitors! The quest to make this vDSLR work soon mounts on your expenses!

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  • Caterpillar

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