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Variable ND Filters

ge22y 12 115 12 Wales
1 Apr 2011 3:05PM
Just had an e-mail flyer from 7 day shop - possible alternative to the welding glass 10 stopper, I imagine it won't be a patch on the Lee big stopper or the B+W 10 stopper but at less than 35 for the 77mm version may be worth a dabble if you haven't got one of the others.
Variable ND 2 - 8 F stops
thewilliam 12 6.1k
1 Apr 2011 4:06PM
You could do the same thing with a couple of polarising filters. Turn then relative to one another to get variable ND.
66tricky 13 742 Scotland
1 Apr 2011 4:19PM
You can have a go at variable ND if you have a circular polariser and a linear one. Put the circular PL at the lens side and the linear at the outside. Rotate one agains the other and you have a variable ND. Depending on the filters used you'll probably have a colour cast. I just tried mine and was able to get a near neutral result by dialing in 10000K as a custom WB.
sherlob Plus
14 3.1k 129 United Kingdom
1 Apr 2011 4:41PM
Thanks for this - I've been wanting to have a play with something like this for a little while. I know the tip about the polarizers, but this is cheaper than an additional 77mm polarizer, and a damn sit thinner - so less vignetting (I hope).

Coleslaw 15 13.4k 28 Wales
1 Apr 2011 5:23PM
good price indeed.
I think Paul Morgan has a similar one (more expensive), and he mentioned about extra care needed when using the filter. Though I have no idea how.
kaybee 16 7.4k 26 Scotland
1 Apr 2011 6:39PM
On wider lenses you have to be careful you don't get a cross caused by the polarising apparently. You need to reduce the amount of density you 'dial in'. It means you can't use the full effect on wideangle landscapes
sherlob Plus
14 3.1k 129 United Kingdom
1 Apr 2011 7:05PM
Thanks Kaybee I'll keep that in mind.

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