10-19-2010, 04:16 PM
(This post was last modified: 10-19-2010, 04:25 PM by Brightcolours.)
[quote name='Walter Schulz' timestamp='1287497315' post='3690']
Variable ND filters are not that new.
Singh-Ray Vari-ND is around some time.
You can put two linear polarizer together: Voila! Vari-ND!
Or use two linear polarizer filter gels.
To test the application you can try 2 circular polarizers. Screw in the first and just hold the second one reversed in front of it. Output is crap, serious problems with "hot" spots.
Ciao, Walter
PS: Linear polarizers may cause phase detection AF and exposure measure to fail. Use live view instead.
[/quote]
Just use one circular pol. filter (on the lens) and a linear pol. filter on that one. That will give the same result as 2 linear ones. But then you have a circular one for normal usage.
And together this way they also avoid trouble with metering and/or AF.
Variable ND filters are not that new.
Singh-Ray Vari-ND is around some time.
You can put two linear polarizer together: Voila! Vari-ND!
Or use two linear polarizer filter gels.
To test the application you can try 2 circular polarizers. Screw in the first and just hold the second one reversed in front of it. Output is crap, serious problems with "hot" spots.
Ciao, Walter
PS: Linear polarizers may cause phase detection AF and exposure measure to fail. Use live view instead.
[/quote]
Just use one circular pol. filter (on the lens) and a linear pol. filter on that one. That will give the same result as 2 linear ones. But then you have a circular one for normal usage.
And together this way they also avoid trouble with metering and/or AF.