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Cameras, Lenses and Accessories: Discuss ND filter...Hi I'm want to improve my long exposure pictures of water. I'm told I can get a better silky effect ...
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Old 20-04-2012, 19:59   #1 (permalink)
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ND filter

Hi
I'm want to improve my long exposure pictures of water. I'm told I can get a better silky effect if I use a +10 stop Neutral density filter.

I have been looking on the web, but have found that there appears to be two types - multi-coated or single coated.

1. Is +10 the right filter
2. what is the difference between the multi and single coat

Thanks
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Old 20-04-2012, 20:20   #2 (permalink)
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Re: ND filter

I think I'm right in saying that most people who show their pictures on here use a 10 stop ND, and IIRC the B&W is the favoured brand, but I think that all of the brands like Hoya, Tiffen and Lee will have NDs in their ranges.

However, a few of us bought this variable ND, and while it cannot match the 10 stops of the B&W, and is probably not as good quality, it is variable, much cheaper and might be a good way to try the technique.

The coating applied to filters are supposed to principally minimise flare and internal reflections, but there are claims that other cottings reduce the transmission of various wavelenght of light, add protection and lots of other things too.
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Old 20-04-2012, 21:43   #3 (permalink)
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Re: ND filter

I have a singray 2-8 varible. I have had it about 6 years and it's worked very well (warm tint) when I have the right location. "They sure arn't around where I live".... I have found that you can get very nice silky effect with #4 and depending on how you set your camera and aperture. I have the B+M #10 (cool tint) but haven't used it. I will put them togather but it 's not going to make what I want any better. Longer exsposures are in the eye of the beholder. Some are good looking and some are just plain over cooked.
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Old 21-04-2012, 12:55   #4 (permalink)
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Re: ND filter

I use a B&W 6 stop which is fine. I cannot see the need for 10 stops and it cannot improve the image by reducing the light more than is necessary as this could introduce noise. In practice, I have tried this filter in full sunlight and certainly achieved the effect I require with 1/4 to 2 second exposures. In poorer lighting even longer exposures would be easy but I am not sure that I would often need that.

I have just looked at a book by the professional photographer Guy Edwardes who takes a lot of silky seas etc. He does not seem to use more than 2 stops ND and most exposures are between 1/2 and 3 secs though there was one taken with a 1 min exposure. It largely depends on the effect that you want. I suspect that we are all tempted to try new techniques and fads (and why not!) but many folks then always use extremes which is not necessary. It is almost certainly worth taking several exposures based on different speeds then deciding which best represents the scene.
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Old 22-04-2012, 15:27   #5 (permalink)
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All
Thanks very much for your guidance. I will do some more experimenting before committing to buying.

Thanks again
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Old 23-04-2012, 14:34   #6 (permalink)
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Re: ND filter

I use the B+W 10 stop MC, i find that usually a 5 sec exposure does the trick, glass cleans real easy to leaving no after effects.
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Old 24-04-2012, 13:04   #7 (permalink)
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Re: ND filter

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I use the B+W 10 stop MC, i find that usually a 5 sec exposure does the trick, glass cleans real easy to leaving no after effects.
Hi Simpbow - What ISO & Aperture do you shoot at?
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Old 24-04-2012, 13:37   #8 (permalink)
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Re: ND filter

Hi, always ISO200 & f/14 & f/4
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Old 24-04-2012, 13:45   #9 (permalink)
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Re: ND filter

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Hi, always ISO200 & f/14 & f/4
Thanks
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Old 27-04-2012, 14:16   #10 (permalink)
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Re: ND filter

Hi Simpbow 1 follow up question - do you merge the 2 images taken at F14 & F4?
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Old 27-04-2012, 23:08   #11 (permalink)
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Re: ND filter

Hi, only merge when say object is close to horizon & protruding into the sky as Nd grad with hard edge becomes very noticeable on the object so i take 3 images @ f14 -0+ or same for f4, i dont merge f14 with f4 because they don't match up, hope that helps
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