1. Produce a strong visual impact; 2. Depth of field can range from a few centimeters to infinity; 3. Select as little line and plane as possible when shoot; And put place the objiect in the certain of the screen when structure the picture. This can minimum the distortion. 4. On contrast, select as much lines and easily identifiable features as possible to place in the edge of the screen to empasis the distortion effect. 5. For most fish-eye lens, the common color filter is not useable.