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Thread: neutral density filters

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    neutral density filters

    Hi
    has anyone had any success making a variable neutral density filter using 2 circular polarisers?
    see here: http://www.petapixel.com/2010/08/27/...ensity-filter/

    You can also make an ND using a circular polariser and a linear polariser - this looks like it maybe be less trouble.
    http://www.digital-photography-schoo...density-filter

    I thought I'd give it a go this weekend

    Russ
    Last edited by russrad; 16-03-2011 at 3:58pm.

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    Without looking in the details inside the link....

    1) stacking 2 x CPL MIGHT introduce unwanted vignette? I know some people are very good landscape photographer using a telephoto lens but I always use a UWA and even a non-slim rim filter will introduce vignette in my shot.

    2) Isn't linear polarizer very likely to stop the AF works in majority of SLR? (not the mirror-less camera)

    3) Finally, 6 x ND filters probably is cheaper than 2 x CPLs

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    Ausphotography Site Sponsor/Advertiser OzzieTraveller's Avatar
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    G'day Russ

    Yes mate - I have tried this several times
    Problem - massive colour shift into the magenta/purple spectrum

    gave up after that ... can post an image if you want to see

    Regards, Phil
    Of all the stuff in a busy photographers kitbag, the ability to see photographically is the most important
    google me at Travelling School of Photography
    images.: flickr.com/photos/ozzie_traveller/sets/

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    Thanks for these replies.
    I was thinking that one filter might be more convenient than my cokin filters, but if you have to unscrew the filters to focus then there is no advantage- I hadn't thought of that.
    Yes, vignetting will be an issue for sure - even on my 16mm
    Massive color shift - doesn't sound good.
    Looks like this isn't worth the trouble.
    cheers, Russ

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    I am older than I look. peterb666's Avatar
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    I was under the impression that you used a circluar polariser and linear polariser to do this.

    As for AF not working, I wouldn't think it was an issue as it wouldn't work very well anyway once you have whacked on 4 or 5 stops plus of light stopping. MF has its uses.
    Cheers

    PeterB666


    My photo-mojo has gone

    Olympus OM-D E-M5 with Metabones Speed Booster and Nikon 10-24mm f/3.5-4.5 - almost as insanely wicked as sin itself... but then again, the Voigtlander 10.5mm f/0.95 is kinda fun.

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    Account Closed reaction's Avatar
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    You can buy variable neutral density filters, but the small small small print will tell you:

    at wide angles you only get max ND2
    at certain ND settings you get radial lines in your shot - which you won't see until after your 5min exposure!

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