Wide Angle Converter

Wide angle converter (0.5x) mounted on Tamron 28-75mm F2.8 compare to Nikon 18-55mm VR. Conclusion: Wide Angle Converter does not product as wide as the factor given. For example 0.5x does not convert 28mm to 14mm (28 times 0.5), but it produces somewhere in between 24mm to 18mm. However it