Knowing that there are good and bad features to variable ND filters, I hope to get some pointers on how to most effectively use one. The chief problem I face is when shooting wide angle (11-16mm) and asking the filter to stop down the light to allow shutter drag. Seems that no matter how little I stopdown the SR, I end up with some polarized darkening of areas of the image (180 degrees opposed to each other). Yes, I recognize I could opt to buy a constant ND filter or go with a higher mm lens, but is there anything else to try?
Thanks in advance for your advice and useful suggestions.
Bob