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close up lens Close-up lens is a similar close-up attachment filter , and then use it as a separate magnifying glass to observe the scene , it 's positive projections for the image is enlarged , while the back was slightly recessed so as to reduce to some extent field curvature . Use this mirror allows the lens much closer than the usual focus on the subject , resulting in close-up images , such as shooting flowers , insects , etc., or a remake of text data. Close-up lens effect is to shorten the closest focusing distance. Close-up Lens Caution: 1 more than 300mm focal length of the lens is not recommended to use a long focal length very shallow depth of field , focusing difficult. 2 . Focal length of 55mm or less lens does not recommend the use of close-up lens , because the lens resolution is low , the effect is not obvious 3 large zoom lens ( eg 18-200mm) is recommended to select a short focal length lens close-up , in order to significantly reduce the focusing distance to increase magnification . 4 excellent main lens imaging ( such as the Canon 70-200mm f/2.8) recommended a longer focal length lens close-up , there is enough focus range. 5 small aperture ( 3 files more narrow aperture ) + Ring Flash + highest + Tripod + sync speed shutter greatly increase the success rate . Inadequacies close-up lens is: aberrations although a certain degree of control, but does not completely eliminate ; slightly when used will affect the clarity of the picture ; focusing the work will be limited. Distance between the camera and the subject needs to be moved to accommodate the focus between the close-up lens attached . Pack including 1 X Foto-gears 58mm Close -up +1 +2 +4 +10 set 1 X black filter bag