GH2 DIY ND Filter - question

I

iflight

Active member
Just getting into SLR video with my new GH2.

I am following the lead of several posts and creating my own ND Filter/polarizer for intro video use by stacking a Circular and Linear Polarizer on top of eachother. I am trying to put together some good quality filters, without braking the bank, so i want to buy a large enough pair that will work for all my lenses (current and future) and use step rings to make them fit.

I have also read that I actually need to get a larger filter than the size of my lens to avoid vignetting for the wide-angle zoom. Is this true? How much larger to i need to go?

Here is my current lens setup:
Panny 14-140 HD (62mm filter)
Panny 20mm 1.7 (46mm filter)
Canon 50mm 1.4 (52mm)
Canon 35mm 2.8 (52mm)

I am thinking that a 67mm set may be the way to go here - what do you think? I don't want to overload the 20mm 1.7, but I also don't want to short-change myself and get vignetting on the 14-140. i am also pretty sure i'll get more lenses in the future, but is it really worth going to 72mm or 77mm filters to be safe?? That seems quite large and i haven't seen many lenses for MFT that would require such a large filter.

Anyhow, really appreciate some advice here. So far I'm thinking of a B+W Circular & a B+W linear polarizer total $126:
http://www.bhphotovideo.com/c/product/11278-REG/B_W_65062138_67mm_Linear_Polarizer.html
and
http://www.bhphotovideo.com/c/product/133009-REG/B_W_65016926.html


Any thoughts?
Thanks.

Thanks.
 
Hi,

I had the olympus 12-60mm and stacked 2 or once even 3 ndfilters on it. They were 77mm sized and at 12mm on the lens it would produce vignetting. One filter was ok of course but I believe already with 2 filters stacked it started to show.
 
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