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Thread started 17 Sep 2012 (Monday) 14:44
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What ND filters for this effect? AND bonus question about circ pol.

 
kristin6
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Sep 17, 2012 14:44 |  #1

During an upcoming trip to Michigan, I'd like to capture some low-angle, wide, long exposures on the short. I'd like to achieve an exposure of between 7 - 20 seconds ideally 30 minutes before and after sunrise/set. Examples: http://us.123rf.com …radise-island-on-beac.jpg (external link), http://www.davidroossi​en.com …gLakeMichigan_7​30x497.jpg (external link)

How many stops should I go? I've heard that anything over 3 does goofy things to the image and that stacking even two lenses causes vignetting. I also haven't heard good things about variable ND's.

I'm shooting with a 40D and I'll be using my 18-200mm (72mm filter) and possibly my Sigma 150mm Macro. I also have a 100-400L (77mm filter). I plan to purchase the 72mm filters and will buy separately for the 100-400 as needed.


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Canon 40D; Canon lenses: 100-400L, 18-200, 50mm 2.5; Sigma 150mm macro

  
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koffikapp
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Sep 17, 2012 16:16 |  #2

For those kind of shots, you'll probably need a 10-stop. What "goofy things" are you thinking of? The only issue I can really think of is color cast, which is easily fixed in post processing anyway.

Consider the B+W 10-stop (external link), I have one and it doesn't vignette at all with my 17-40 on FF, great quality. They have cheaper, uncoated variants as well.

LEE Big Stopper is also a popular option, although I haven't used it myself.




  
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MCAsan
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Sep 17, 2012 16:22 |  #3

Lightcraft VND so you can dial in as much drop as you want.




  
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kristin6
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Sep 17, 2012 16:37 |  #4

MCAsan wrote in post #15005093 (external link)
Lightcraft VND so you can dial in as much drop as you want.

Do you have one? How do you like it? I was told that it doesn't create the best image. Don't have much detail beyond this.


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Kristin
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Canon 40D; Canon lenses: 100-400L, 18-200, 50mm 2.5; Sigma 150mm macro

  
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v35skyline
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Sep 17, 2012 21:23 |  #5

kristin6 wrote in post #15005170 (external link)
Do you have one? How do you like it? I was told that it doesn't create the best image. Don't have much detail beyond this.

The general consensus is that it does its job. If you're a hobbyist and don't wanna shell out for the best, it will do fine. Otherwise, if you want the best, Singh-Ray. But prepare to pay.

I bought a cheap-o $15 vari-nd filter from Amazon purely to see if I'd like the idea of one. I do. I'm now saving up for a Singh-Ray - either vari-nd or vari-n-duo.

You may also want to consider rectangular graduated ND filters like the Lee, or cheaper Cokin, systems.


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HaroldC3
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Sep 17, 2012 23:38 |  #6

Buy a 77mm filter and then a 72->77mm adapter. Also I would recommend the B+W 10-stop filter as well. I have a 6-stop filter and consider it essential.


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aegid
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Sep 17, 2012 23:46 |  #7

Note that with variable ND filters you will get an X in photo when at wide angles and with the maximum light reduction. If you're aiming to do 30" exposures in bright daylight you'll have to use a standard ND.


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kristin6
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Sep 18, 2012 07:35 |  #8

Thanks everyone! I'll get the 77mm B+W 10 stop multi coat with the step up and I'll sacrifice the hood. The only lens that will impact right now is the 150mm Macro which I don't think will be a big deal.


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Kristin
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Canon 40D; Canon lenses: 100-400L, 18-200, 50mm 2.5; Sigma 150mm macro

  
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What ND filters for this effect? AND bonus question about circ pol.
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