amblekingrat
journeyman
Reged: 21/07/2007
Posts: 79
Loc: northumbria
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JUST WONDERING IF ANYONE HAS EXPERIENCE WITH THIS FILTER.I HAVE HAD ONE FOR A COUPLE OF WEEKS AND ITS RESULTS CAN BE VERY EFFECTIVE.
HOWEVER,EVERY NOW AND THEN,A SHOT WILL HAVE VERTICAL WHITE LINES RUNNING FROM TOP TO BOTTOM,THESE VARY IN STRENGTH AND NUMBER.
I HAVE TRIED USING A LENS HOOD,SHOOTING AWAY FROM SUNLIGHT,SHOOTING IN LIGHT WHERE THE SUN ISNT A FACTOR BUT OCCASSIONALLY THESE LINES STILL POP UP.
I DONT HAVE ANY IMAGES SHOWING THIS AS I DELETE THEM UPON DISCOVERY,BUT HERE IS ONE TAKEN BY A FLICKR CONTACT OF MINE WHO IS HAVING THE SAME TROUBLE.
http://www.flickr.com/photos/mouldy/2655630565/
ANY HELP WOULD BE MUCH APPRECIATED.
THANKS STEVE.
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Rhys
Sasquatch
Reged: 15/01/2004
Posts: 2731
Loc: York (home of the speedbump)
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Do you know by any chance what a 'caps lock' button is?
Please don't shout 
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NRIPN (Officially Nuts..)
RGMP.co.uk (My Website.. well early stages anyway)
Benchinistas.org.uk The home of Benchism
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beejaybee
Marvin
Reged: 18/07/2007
Posts: 4241
Loc: Really Here In Name Only
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Quote:
ANY HELP WOULD BE MUCH APPRECIATED.
YOU'D BE MORE LIKELY TO GET IT IF YOU DIDN'T SHOUT SO BL**DY LOUD!
The "lines" on the sample image are simply reflections in the water of the bright spot of sky immediately above the skyline.
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amblekingrat
journeyman
Reged: 21/07/2007
Posts: 79
Loc: northumbria
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you know how it is,you leave your caps on by MISTAKE and everyone assumes your shouting,sheeesh.
not stop whispering and help me out please.
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El Sid
Going potty
Reged: 14/04/2003
Posts: 9160
Loc: Sussex-by-the-Sea
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BJ has already advised the source of the issue...
Judging from the sky in your freind's image and the nature of the filter this was a fairly long exposure. What you are seeing it the effect of this long exposure emphasising and artificially enhancing weak highlights that are changeing and moving. A normal exposure of fractions of a second would either not capture them at all if they are very weak or fix them in one point. In this case the movement of the cloud means the 'highlight' is moving across the water and the long exposure has allowed this to be seen and appear brighter than it would to the naked eye.
One of the joys of long exposure photography is the chance to capture things in a way the human eye cannot see. One of the downsides is that the results aren't always predictable nor desirable.
Looking at your friends pic I don't think it should be overly difficult to tone the bright bits down in PS or similar...
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Nigel
Completely BSRIPN 
ElSid Gallery
A camera in the hand is better than one in the cupboard........
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amblekingrat
journeyman
Reged: 21/07/2007
Posts: 79
Loc: northumbria
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cheers nigel,much appreciated.
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Zou
Pooh-Bah
Reged: 05/02/2007
Posts: 2024
Loc: Edinburgh
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Interesting - I've been thinking about getting one of these filters as I love the ultra long exposure look.
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Zou's Flickr Page
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beejaybee
Marvin
Reged: 18/07/2007
Posts: 4241
Loc: Really Here In Name Only
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This issue featured on a thread about a few months ago. The B+W 110, like many other dyed glass filters, passes quite a lot of infrared light; though most of this is blocked by the filter in your camera some leaks through, and you are likely to get an odd red/brown toning on longer exposures, which may not be controllable with the colour balance controls on the camera. The effect varies between cameras - not much on my Canon 5D but very marked on (IIRC) Nikon D80 - but a UV/IR blocking filter used on the lens in addition to the ND filter fixes the problem. (B+W 486. This is an interference filter and is expensive).
You may, of course, like the red/brown tint; the strength can be varied at will since it appears to be nil with exposures of 1 sec or shorter and quite severe with exposures over 30 sec. I'm not entirely sure what's going on; there seems to be some interaction with the long exposure noise reduction software as well as sensor & filter transmission characteristics.
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