550d Zooming during movie

Started Feb 26, 2010 | Discussions thread
skanter
skanter Forum Pro • Posts: 24,081
Re: 550d Zooming during movie

caterpillar wrote:

Also, the lens has to be parfocal. It means, it must maintain the initial focus otherwise, there is added work to re-acquire focus.

Is this listed in specs - or, how can one accurately test if a lens is parfocal? All prosumer videocams I've used are parfocal, not sure about zoom lenses I use with T2i.
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Sam K., NYC

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