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Step 5Usage
To change the darkness of the filter just twist the front polariser while keeping the back filter stationary. A twist of 90° will take you from maximum darkness to maximum clearness. My filters gave me about a 10 f-stop range, from ~4 f-stops darker to ~14 f-stops darker.
The light from the filters entering the camera is circularly polarised so should work with all digital camera autofocus and metering mechanisms. Unfortunately, because this method is based on polarisers, you will see some of the normal effects of polarising lenses - bear this in mind if you are photographing reflective objects such as glass or water. The filter construction is also quite thick so you might get more vingetting, especially at short focal lengths on zoom lenses.
Depending on the quality of the filters you might see some colour changes depending on the orientation of the filters, blue in one direction and yellow in the other. The blue tint can normally be countered with a fluorescent light white balance setting.
The light from the filters entering the camera is circularly polarised so should work with all digital camera autofocus and metering mechanisms. Unfortunately, because this method is based on polarisers, you will see some of the normal effects of polarising lenses - bear this in mind if you are photographing reflective objects such as glass or water. The filter construction is also quite thick so you might get more vingetting, especially at short focal lengths on zoom lenses.
Depending on the quality of the filters you might see some colour changes depending on the orientation of the filters, blue in one direction and yellow in the other. The blue tint can normally be countered with a fluorescent light white balance setting.
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