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Don't dismiss aliasing

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Alister ChapmanDon't dismiss aliasing
by on Mar 17, 2010 at 12:43:33 am

The aliasing issue is big one. Aliasing is not just the colored moire that appears over textures and patterns but it also appears on edges as stair stepping. While you can de-focus backgrounds etc to prevent them from aliasing, anything that is in focus will contain alias artifacts. This can make pull focuses look bad or subtly change colors as you focus. In addition alias edge artifacts (which may not be easily visible) tend to move in the opposite direction to any true movement in the image and this really messes up long GoP codecs, eating up bandwidth. So IMHO for broadcast work the Canon DSLR's are not suitable as you don't know how the alias artifacts will work the way down through the production chain unless you use an antialias filter such as the Caprock. BUT you will need different filters for different focal lengths and exposures. Hopefully Canon or a third party will bring out a behind the lens AA filter.

I also don't think the resolution is anywhere near full 1920x1080 and cameras like the EX offer greater dynamic range, but if you want shallow DoF on a budget the Canons are hard to beat.


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