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DPChallenge Forums >> Hardware and Software >> Polarizing for a wide angle?
Showing posts 1 - 7 of 7, (reverse)
11/06/2005 02:24:11 PM · #1
I was looking to get a polarizing filter for my Nikkor DX 18-70mm but I have read that a polarizing lens on a wide angle can have unfavorable results, is the Nikkor DX 18-70mm to wide... oh yes I am using a D70.
11/06/2005 02:32:47 PM · #2
some polarizers are made for wide angle, they will not have threads for adding other filters on top to make sure they don't block the 'wide' view. But that's only happens on full frame. with D70 you have a 1.5crop so you should not worry about this anyways.
11/06/2005 02:40:08 PM · #3
I have a polariser that I use with my Tokina 12-24. As gaurawa said it's a thin circular polariser and you cannot add anything else on to it. It's also hard to have a cap stay on properly. But it works well with no vignetting. It's a B&W slim circular polariser and I got it from B&H. You'll have no problems with something like that on your lens.

Then other thing to be aware is that extreme wide angles, the polarising effect on the sky is not uniform so some parts will be much darker than others. Don;t know if it will happen at 18mm but it certainly does at 12mm. It's because you're capturing a broad span of sky where the rays are all at different angles to the sun and therefore differently polarised to begin with.
11/07/2005 01:30:39 AM · #4
11/07/2005 02:48:11 PM · #5
I seriously doubt that an 18mm range would cause vingetting with a regular sized Polarizer, my Tamron 17-35 does not with a polarizer, but the Tokina 12-24 does at 12mm.

11/07/2005 02:53:31 PM · #6
Originally posted by 0055:

but I have read that a polarizing lens on a wide angle can have unfavorable results

They are talking about the uneven sky. It happens on wider lenses, unless your shooting a vertical.
11/07/2005 02:59:14 PM · #7
As Brent posted, there are two effects to watch out for... the one he referes to is caused by the fact that a really wide lens taakes in so much of the sky that the effect of the polarizer varies across the frame. The other effect, vignetting, is caused by the filter casing getting into the frame. I don't think this second effect will be an issue at 18mm with a cropped cam. You can test if you have any other filter (like UV) with that thread size, just mount it and see if you get dark corners at 18mm, full aperture. Compare with no filter.
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