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Thread started 22 Jan 2015 (Thursday) 14:40
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Circular Polarizer or ND filter

 
jimmyt
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Jan 22, 2015 14:40 |  #1

I would like to set my camera to take the picture in the afternoon strong sun light, I can not use DOF when set down to f4.

I don't know exactly which filter below will help me to do the job

Tiffen 77mm Circular Polarizer $40

Tiffen 77mm Variable Neutral Density Filter $150

Please give me some advise the right one for me

Thanks


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sandpiper
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Jan 22, 2015 16:06 |  #2

jimmyt wrote in post #17395037 (external link)
Please give me some advise the right one for me

What are you wanting to do exactly? In order to help you with what you need to do the job, we need to know what the job actually is. You only say that you want to be able to use f/4 in strong sunlight.

There is no problem using f/4 in direct, bright sunlight for setting DOF, it just needs a shutter speed of around 1/1600th at ISO 100. No need to use a filter to allow you to use any aperture, and therefore DOF, you want, so you don't need anything to help you do that.

Are you specifically wanting to use a slow shutter speed? If so, that is a completely different situation to the one you mention (where you just say you can't use big apertures). If you are wanting a slow shutter speed, what speed do you need to get down to? Are you just wanting to get down to 1/200th to allow flash synch for fill flash, maybe 1/80th to get good prop blur with aircraft or background blur with racing cars, or do you want to go really slow (maybe a second or two or longer) to blur waterfalls etc.?

In order to know how dense a filter you would need to get a certain shutter speed at f/4, you need to calculate how many stops slower you need to go, then select a filter that gives you that amount of adjustment.

Also keep in mind that a CPL alters the image, in terms of reducing reflections, deepening blue skies etc., and a ND filter doesn't, it simply reduces light getting into the lens. Variable ND filters can have problems when set to the higher densities (often a cross will appear in the image as the density created by the two polarisers varies across the frame) particularly with cheaper, lower quality filters. Some ND filters, again particularly the cheap ones, can have colour cast issues.

Tiffen do not come to mind as one of the quality filter manufacturers. In fact, they are generally a pretty poor quality product.




  
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Sirrith
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Jan 22, 2015 18:43 |  #3

Not quite sure what you want, but I think you mean you want to be able to use wider apertures during the day. This means you need an ND filter. I would not get a variable ND because they are expensive, and usually not as good (and they produce an X pattern at higher values). Just get a 2 stop ND, and you should be able to use 1/4000 shutter speed to let you have an aperture as wide as f1.4. If you want slower shutter speeds, then use a stronger ND.


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sandpiper
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Jan 22, 2015 21:39 |  #4

You should be able to get to f/1.6 or f/1.8, without any filters, by using 1/8000th second at ISO 100. You could get to f/1.4 by using ISO 50, but that carries certain potential issues as it is an expanded ISO, so is still ISO 100 pulled in software.

If you want to go all the way to f/1.4 then, as Sirrith suggests, a low density (couple of stops) ND filter will easily do the job, and so should a CPL come to that as they can lose you about 1.5 - 2 stops of light at maximum density. Which is best for you depends on whether you want the polariser effect or not, and whether the CPL could give you other opportunities, used just for its polarising properties, when shooting at smaller apertures. The CPL would be more versatile.

Obviously, if you want to use slower shutter speeds, then you are going to need significantly more light blocking capability.




  
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jimmyt
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Jan 23, 2015 11:06 |  #5

After I read all post from ( Sandpiper; Serrith) now I understand I don't need ND filter.
but I need CPL filter, which brand you guy recommend for me?

thanks


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jimmyt
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Feb 04, 2015 08:57 |  #6

Is this good CPL filter ?

B+W 77mm Kaesemann Circular Polarizer with Multi-Resistant Coating

http://www.amazon.com …Polarizer+MRC+N​ano+Filter (external link)


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FarmerTed1971
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Feb 04, 2015 09:01 as a reply to  @ jimmyt's post |  #7

Yes, that's a good one... but if you are going to spend that much you might want to consider a slight step up ...

http://www.amazon.com …1IX0?tag=thedig​italpic-20 (external link)


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jimmyt
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Feb 04, 2015 10:31 |  #8

FarmerTed1971 wrote in post #17414854 (external link)
Yes, that's a good one... but if you are going to spend that much you might want to consider a slight step up ...

http://www.amazon.com …1IX0?tag=thedig​italpic-20 (external link)

Thanks for the link I will make an offer with Greentoe for this


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cuda2k
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Feb 08, 2015 22:11 |  #9

I've been very happy with my Marumi filters. Slightly well known brand, but in some of the 'filter shootouts' I've read they have performed on par or beating some of the filters costing much more:

http://www.amazon.com …=77+mm+circular​+polarizer (external link)


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Circular Polarizer or ND filter
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