Close-up attachment lenses no. 0,1 and 2 are recommended for use with lenses having a focal length of up to 55mm. Lenses no. 3T and 4T are two-element archromat lenses providing high image quality, and are intended primarily for 85mm to 200mm lenses. The greater the diopter value of the attachment lenses, the closer the subject can be approached. The longer the focal length of the lens used, the greater the magnification which can be achieved.