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FORUMS Photography Talk by Genre Nature & Landscapes Talk 
Thread started 28 Aug 2012 (Tuesday) 12:28
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Neutral Density Filters and Daytime Long Exposures

 
yangke
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Aug 28, 2012 12:28 |  #1

I'm hoping to get some long exposure shots of clouds and water during the daytime. Which type of ND filter do I need? (How many stops) I'm hoping to get some where around 30sec-2 minute exposures


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sdblade
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Aug 29, 2012 12:39 |  #2

You'll need a 9 to 12 stop ND filter for those exposure times. The Lee Big Stopper is very popular but expensive. For a few dollars you can improvise with welding glass, if you use the search facility you will find whole threads dedicated to this technique. I use the welding glass and I've had some great results with it.
Good luck.




  
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MCAsan
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Aug 29, 2012 17:26 |  #3

I use a Fader variable ND that lets me dial in up to an 8 stop light reduction. Great for slowing down moving water. I believe you can purchase them from Amazon, B&H, Adorama, and other sources.




  
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RobDickinson
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Aug 29, 2012 22:12 |  #4

Fade/polariser ND filters dont work very well (at strong settings) on wide angles though.
A 9-12 stop filter is handy..

You can take a number of longish exposure shots (2seconds) and blend them in post using photoshop for a really long exposure look, takes a bit more effort.


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Cali_PH
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Aug 29, 2012 22:44 |  #5

Some people also use smaller apertures to extend their exposure time, but of course you have to balance than with increasing diffraction and image quality issues.




  
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tacosanchez
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Sep 03, 2012 13:40 |  #6

Honestly I wouldn't go with anything other than Lee's Big Stopper 10 Stop filter + either Cokin P filter holder system or Lee's filter holder system. You'll also probably need a graduated ND filter to balance the sky with the water, I find the .9 soft GND by Lee is the best I've used. I've had Hoya and Cokin but Lee is the only one I have seen no colour cast with, the Cokin has the most HORRIBLE magenta cast that is nearly impossible to get out in post and the Hoyas are screw in which I don't like because it's less convenient than slide filters (you need to compose the shot before putting the filter on and it's easier to do with slides).


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Busted ­ Knuckles
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Sep 03, 2012 15:45 |  #7

Variable NDs - do they replace a CPL?


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SuffolkGal
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Sep 05, 2012 16:40 |  #8
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ND's and CPLs do quite different functions.

Even if you aren't going to get Lee filters, their web site has excellent videos and information that explains (far better than I could) how they all work.

http://www.leefilters.​com/ (external link)

The main filter types in use for DSLR are Standard Grad ND, Soft Grad ND, Hard Grad ND, Reverse Grad ND and CPL.

To my knowledge, Reverse grad is the only type of ND Lee don't do. (Would appreciate confirmation on this, because one sales guy told me there is one, but I don't see it on the Lee site.)

Hope this helps,
Jenny




  
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Neutral Density Filters and Daytime Long Exposures
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