Grey graduated filters B+W gradient filters are used to darken the sky or foreground. They are each half neutral grey tinted, which melts softly into the undyed filter half. The rotating B+W filter holder allows precise horizontal alignment when the filter is screwed on. - Adjusts brightness differences - Ideal for landscape photography - Even flow from edge to centre - Available in 2 thicknesses - Suitable for analogue and digital cameras - Made in Germany The basis of a B+W 701 or B+W 702 gradient filter is a ground and finely polished glass substrate of the highest quality. Due to their stability, glass substrates are very durable compared to plastic substrates that scratch very easily. A B + W grey graduated filter is mainly used to compensate for a too bright sky. For exposure measurement, the camera or hand exposure meter should be aimed at the correct foreground without a gradient filter. For the sky, the optimal effect is almost always automatically obtained. Exposure allowances to compensate for absorption in the dense part of the graduated filter should be limited so that the filter effect is not too attenuated. If the exposure measurement is done through the filter, a minus correction of about 0.5 light values may be advantageous. Additional information: The grey gradient is applied using thin film technology. The special coating process requires special masking. This is associated with certain manufacturing tolerances with the result that the run limit is not exactly parallel. Since this transition is outside the sharpness range, the effect is not visible and there is no static transition.