This regulation focusing is designed for and film cameras. Suitible for most , and macro and DSLR cameras. Smooth rack and pinion movement provides extremely fine focusing adjustments. The geared drive system can greatly accuracy and of adjustment of . Features - ColorBlack - Size: 16 x 9.2 x 2cm - This regulation focusing is designed for and film cameras. - Suitible for most , and macro and DSLR cameras. - Smooth rack and pinion movement provides extremely fine focusing adjustments. - The geared drive system can greatly accuracy and of adjustment of . - The screw size is deigned with standard : 1/4" screw, fit most tripods and copy stands. - Focusing rails are essential accessories for macro photography, which requires precise distance modifications and , as well as other situations where accurate camera positioning is . Package list: 1 x focusing