changing ND Filter state in Video Mode by script

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hi i have a powershot A470 (digicIII) camera
,im interested in getting rid of vertical smear that appears when recording video in bright light, a way to do this is to use a ND filter to darken the light ,"set_nd_filter 1" doesnt work for video mode ,i can put it in only in manual mode for photos ,is there a way to have the filter in and record a video ,is it posible with a lua script and "native calls" ?

example of vertical smear : http://www.dvinfo.net/forum/jvc-gy-hm100-camcorder/379708-vertical-smear-fireworks-display.html

thanks
-peter
dimakisp@gmail.com

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