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I have a mystery for you. I took my new 10 stop variable lens down to the beach yesterday to try my hand at long exposures. I used my 18-105mm lens, which I use daily, with the new filter and I got this strange result. See picture. All the photos with this lens came out like this . So after a little panic about my filter being faulty, I put the filter on another lens, my 70-300mm (the only other 67mm fitting) and I didn't have any problems, photos did not have this mark on, but I obviously didn't want to use this lens for long exposures. Argghh. I have no idea what is causing this.
Please help. Jude ♥
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I heard a report on the "this Week in photo" podcast the other day that an X pattern can be a problem with variable filters and wide angle lenses. unfortunatly they didn't say if there was any cure apart from use a different flter. Here is another report about it.
I'm guessing that as it is basically two polarisers working together that the angle of the sun might add to the effect too. But the advice seems to be not to use them on max or on wide angle.
I find mine can give strange results at max density. As lobsterboy says, these are polarisers and the direction of the light can have an influence.
I get the same problems. You need to reel it back a stop. On maximum setting this will always happen. Most Vari ND instructions will confirm this.
Lobsterboy has it right the only way to gaurantee even light reduction is to use a fixed strength ND.
All the various variables have this problem, some worse than others,at the max setting particularly with the wide angle lenses
When using the filter near to maximum density try checking the image with live view and you can see the cross effect and adjust to remove
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