Dorr Extension Tube Set 13/21/31mm Canon FD Fit

Dorr Extension Tubes 13/21/31mm Canon FD Fit are designed to enable a lens to focus closer than its normal set minimum focusing distance which magnifies your subject. Dorr Extension Tubes are really useful for macro photography, enabling conversion of  most lenses into a macro lens at a fraction of the cost while maintaining the original optical quality.The Doerr Extension Tubes 13/21/31mm Canon FD set has three tubes of differing length, a 13 mm, 21 mm, and 31 mm, which can be used individually or in any combination to obtain the desired magnification.  Dorr Auto Extension Tube's are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Canon, Nikon, and Minolta lenses given there is enough light to activate the cameras AF system properly.