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FORUMS Canon Cameras, Lenses & Accessories Canon Accessories 
Thread started 04 Nov 2013 (Monday) 03:49
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Heavy vignetting on my Variable ND

 
simpy
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Nov 04, 2013 03:49 |  #1

hey guys, quick question.

do you know why this happens? it's a variable ND filter infront of the lens, the higher stop i go, the bigger the 'V' and darker it becomes

IMAGE: http://i.imgur.com/B7GQcKG.jpg

Canon 5dm2

  
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hollis_f
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Nov 04, 2013 04:47 |  #2

It's an inherent problem with all VNDs. It gets worse as the focal length decreases and the intensity increases. At 10mm on my 7D a VND is only good up to 2 or three stops. There is nothing that will prevent it.


Frank Hollis - Retired mass spectroscopist
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John ­ from ­ PA
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Nov 04, 2013 08:28 |  #3

IMPORTANT:
Only use your Variable ND within its recommended 2 to 8 stop range. If you go beyond the “MAX”, you may experience an uneven exposure or color shift that appears as an “X bar” in the image. This is more common when using higher densities on full frame cameras; however, can be experienced on any camera. This is a common issue– it’s the law of physics when combining two polarizing filters; however, this issue can be eliminated. First, adjust your focal length and then reduce the density (stop value) setting by rotating the filter ring until the color shift disappears.

From Tiffen's website...

In addition to what has been said, make sure you are using a low ISO so you can pull the variable ND into mid-range.




  
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Heavy vignetting on my Variable ND
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