Variable ND filters are they any good and how do they work

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Name
BRAD
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#1
I have a digital bridge camera with no filter thread and to get a little more from it I was thinking of getting a variable ND filter and use the blue tack bodge (classy I hear you say) Are these any good for experimentation and how to you adjust them ?

Cheers all
 
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Richard
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#3
As Jerry says. The problems are that there are two filters involved and four surfaces to cause potential problems. Unless the filters are very high quality and multi-coated (think expensive) then you could run into flare issues and loss of sharpness.

But that aside, they all suffer from a dark cross appearing across the image with wide-angle lenses when the density is ramped up, which makes them a nonstarter for a lot of landscapers. Here's a link to a random example from google images https://photo.stackexchange.com/que...s-with-a-variable-neutral-density-filter-poor
 
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Phil
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#4
Depends on what you intend to be doing in your experimentation. As above to get reasonable quality look at pricey. To be fair makers like Hoya do stress the dark X issue. I have and use a Hoya, only on my 135 f2 when I need more power than HSS gives me when using flash in daylight.
 
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Phil
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#5
(I’m not a landscape shooter)
Personally I think that a 3 stop and a 10 stop takes up roughly the same space, is cheaper and almost as versatile. With none of the disadvantages.
 
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Phil
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#6
Depends on what you intend to be doing in your experimentation. As above to get reasonable quality look at pricey. To be fair makers like Hoya do stress the dark X issue. I have and use a Hoya, only on my 135 f2 when I need more power than HSS gives me when using flash in daylight.
I use a 3 stop...
See above.
 
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Phil
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#8
I use a 3 stop...
See above.
Agreed, if you can get away with a single filter, I just found I was needing a little bit more or a shade less.. (its being lazy really :p ) What I really should have been saying is that other than that and video as mentioned (I don't do video) there isn't really a good reason for them...
 
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BADGER.BRAD
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Name
BRAD
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#9
I'll go with Phil V's Idea and get a couple of filters main idea is to smooth out water and get a little movement in skies, Thanks all
 
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