ND Filters

Basically it's 2 cpls stacked in the filter. Turning one against the other varies the light transmission
 
I opted out as I want graduated for skies rather than stopping down. but I may have a dabble at some point in summer for the seascapes etc. thanks for confirming how they work.
 
davidh6781 said:
I opted out as I want graduated for skies rather than stopping down. but I may have a dabble at some point in summer for the seascapes etc. thanks for confirming how they work.
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They are not grads, as you say.

And yes they work as a variable ND filter, but they're not very good IMHO. The cheaper ones have sharpness issues and even the most expensive are useless on wide-angles at high density settings. A dark cross appears over the whole image. Here's an example from google images http://www.dgrin.com/showthread.php?t=215207
 
HoppyUK said:
They are not grads, as you say.

And yes they work as a variable ND filter, but they're not very good IMHO. The cheaper ones have sharpness issues and even the most expensive are useless on wide-angles at high density settings. A dark cross appears over the whole image. Here's an example from google images http://www.dgrin.com/showthread.php?t=215207
Click to expand...

I had a cheap one from 7dayshop, it was decent optically, but at higher density settings it produced exactly the same results as those illustrated in the above link.
Fortunately I was able to get a refund, but on the basis of my experience, I wouldn't recommend one.

If you are looking for a high density ND filter, I'd suggest a fixed one would be better, and more reliable.
 
I just ordered a couple of the cheap ebay ND filters and a filter holder - the holder hasn't turned up yet but I had a quick play with the graduated filter (hand held!) and the colour isn't spot on, but certainly worth £1.60 just to try out :)
 
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