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Thread started 05 Nov 2012 (Monday) 15:44
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ND filter question

 
calypsob
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Nov 05, 2012 15:44 |  #1

I was looking to buy this guy for my Tokina 11-16mm http://www.ebay.com …&hash=item5890e​7d4bb#shId (external link) and I noticed halfway down the page it says "Note:
According to the optics theorem, it is not recommended to apply this filter for wide angle lens (<24mm, 35mm film format equivalent).
Image quality may drop when focal length above 200mm" So what does this mean exactly? Will it not work at all with my lens or what?


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koffikapp
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Nov 05, 2012 15:48 |  #2

I bet with such a cheap filter, you'd get image degradation regardless. But all variable ND-filters have trouble on wide angle lenses, as you'll eventually get cross-polarization, even with the more expensive ones - although these should retain the image quality.




  
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calypsob
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Nov 05, 2012 15:52 |  #3

Hmm I didn't know ND filters were polarizers, I always assumed it was gray tinted glass. Very interesting.


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gonzogolf
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Nov 05, 2012 15:52 |  #4

Believe them. Some of those filters rely on using two polarizers stacked to filter light. The effect is magnified on wide lenses and you get an x pattern where they cross. Skip it.




  
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gonzogolf
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Nov 05, 2012 15:53 |  #5

calypsob wrote in post #15210684 (external link)
Hmm I didn't know ND filters were polarizers, I always assumed it was gray tinted glass. Very interesting.

Regular ND filters are. The faders rely on polarizers.




  
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hollis_f
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Nov 06, 2012 03:57 |  #6

Here's my 11-16 with a Polaroid VND. No filter, 4-Stops, Near Maximum

IMAGE: http://www.frankhollis.com/temp/VND%20Tes%2011mmt.jpg



And here's what it looks like at 400mm. VND on the right, Heliopan 10-stopper on the left.

IMAGE: http://www.frankhollis.com/temp/VND%20Test.jpg

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morph2_7
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Nov 06, 2012 15:57 |  #7

calypsob wrote in post #15210684 (external link)
Hmm I didn't know ND filters were polarizers, I always assumed it was gray tinted glass. Very interesting.

As far as I understand Variable ND filters are 2 polarizers stacked together. I've seen tutorials on do-it-yourself VND filter. You basically reverse 1 CPL glass and stack it on top of another (not reversed). Here's the link: http://www.youtube.com​/watch?v=76Z7l-p2RR0 (external link)

Btw, the ebay seller is not trustworthy. Take a look at this page: https://photography-on-the.net …read.php?t=1220​090&page=9




  
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calypsob
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Nov 06, 2012 19:17 |  #8

hollis_f wrote in post #15212898 (external link)
Here's my 11-16 with a Polaroid VND. No filter, 4-Stops, Near Maximum

QUOTED IMAGE



And here's what it looks like at 400mm. VND on the right, Heliopan 10-stopper on the left.

QUOTED IMAGE

Thanks HOllIS! I cruised the net in search of some examples with this lens and had no luck so this is perfect, glad I didn't find out the hard way.+1


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calypsob
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Nov 06, 2012 19:23 |  #9

morph2_7 wrote in post #15215284 (external link)
As far as I understand Variable ND filters are 2 polarizers stacked together. I've seen tutorials on do-it-yourself VND filter. You basically reverse 1 CPL glass and stack it on top of another (not reversed). Here's the link: http://www.youtube.com​/watch?v=76Z7l-p2RR0 (external link)

Btw, the ebay seller is not trustworthy. Take a look at this page: https://photography-on-the.net …read.php?t=1220​090&page=9

Thanks for the heads up morph. We talk about the pros and cons of chinese business transaction in my supply chain class all the time, the scammers never cease to amaze me. I might give that diy project a go on my non - wide angles. I do know that I have heard of using linear l=polarizer film to cover flash heads for macro, probably kind of the same concept.


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ND filter question
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