GH1 waving defect

the-void

New member
Hey,
I`m experiencing this issue with my gh1 + kit lens - sometimes i get a slightly noticeable, but sometimes a horrendously annoying waving defect (horizontal moving waves). Here is an example:
http://www.youtube.com/watch?v=9LIKmhxrVaw
(the first part is shot with the shutter speed set to 1/30, iso 1600, 24p, the second - shutter speed 1/40, iso somewhere around 300, 24p) (the moving waves are clearly visible in the second part, but also in the first one if you make the viewing window smaller).
Well, it is quite obviously a shutter related issue, since these kind of waves seem to disappear only with the 1/50, 1/100 shutter speed and usually also with the 1/30 when used with a lower iso). But still the fact that these waves sometimes appear and sometimes don`t when i`m filming with a shutter speed 1/30 is frustrating, because I do prefer to use a lower shutter speed when I need to compensate the lack of a decent lighting instead of boosting the iso up to the max, since it does not affect the motion in any negative way).
So maybe someone can help me out with an advice - should i just avoid using 1/30 (and also any other except 1/50, 1/100) shutter speed when filming in 24p? And that probably mean that i should also invest in a lens that can pull off filming in low light situation, because with a 1/50 and even if i boost the iso to the max 1600 it will be a dark mess (and unfortunately most of the filming gigs i have are in low light places with no real ways of using extra lighting, so that is not a plausible option)), right ? Or maybe is there anything else i could do to avoid this issue?

Thanks
 
This problem is caused by any light source that flickers at a high frequency (e.g. fluorescent lights, CRT screens, etc.) - In particular here, fluorescent strip lights that flicker at the frequency of the power source (for instance 50Hz in Europe, 60Hz in US.)
Try to keep your shutter speed at 1/50 if you are shooting 24p or 25p. Or 1/60 if shooting in 60Hz territories. It's best to avoid 1/30 unless you REALLY need it, because it blurs motion more and can look quite soft and sloppy when handheld.
Invest in some lenses that are faster than the kit zoom; anything f/2.8 or faster is already better, get a f/1.8 or faster prime. Other than that, get a GH2, as the GH1 video looks really bad past ISO 500 IMO.
 
Also think about buying a small portable light, or even a collapsible reflector. A little extra lighting can make a massive difference if you can manage it.
 
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