05-04-2013 02:58 PM
Back again with a general outdoor video shooting question.
In order to avoid overexposure in daytime maintaining 24fps at low ISO ,wide open aperture, 1/50 for example ,do you use any ND or CPL (or both) filters on you lenses ?
As far as I know these filters are complementary ,the ND will reduce the brightness and CPL will darken skies for richer blues, will reduce reflections from water, cut glare from vegetation and pump up overall color saturation in the images.
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05-05-2013 01:31 AM
05-05-2013 06:42 AM - edited 05-05-2013 07:04 AM
thank you for your answer ,I already have the CPL, i's all clear now, I need to do some tests before buying any fader ND filter. all the best,
PS: I.ve found this in the fader ND description :
"It may not be suitable for wide angle lens <24mm,35mm film format equivalent."
Perhaps there could appear vignette problems or other unwanted image side effects (?!).I have a 16-35mm as I've mentioned .do you think that using a fader ND like this could be a problem ? Thanks,
05-06-2013 11:44 AM
05-06-2013 12:29 PM - edited 05-06-2013 12:30 PM
Here's some interesting info and tests on CPLs, thickness and stacking:
My personal experience is, I use a slim B&W CPL on my 16-35, I have no vignetting at 16mm wide open as expected, I've never stacked filters so I can't comment on that.
05-15-2013 01:00 AM
If you are NOT using auto focus, you can stack two Linear Polarizers, and when rotated 90 degrees to each other will create a complete blackout. So between 0 degrees and 90 degrees, you have a completely variable ND filter. Don't take my word for it, get yerself some REALD 3D glasses (2 pairs) put them face to face. Rotate one side, and you will see a complete blackout with variation in between. http://www.reald.com/
The way the RealD 3D glasses work is that each lens is polarized 90 degrees to the other. The two projectors have corresponding filters over their lenses. Your eyes see it and your brain does the rest...combines the two images. All you are doing for the variable ND filter is stacking the linear polarizing filters. I repeat: your autofocus will not work with this. You'll most likely have to do manual focus.