Features 4-element 1.4x teleconverter for autofocus lens mounts Will autofocus with lenses that are F/4.5 or faster Best optical results obtained if used with telephoto zooms only The 1.4X teleconverter will increase the focal length of the master lens by 1.4X and make the lens one f-stop slower.It will also allow greater magnification in macro since the Minimum Object Distance (MOD) of the master lens does not change when used with the teleconverter The 1.4X teleconverter can be used with both AF and MF lenses. AF will be retained if the master lens is F/4.5 or faster. . Can be used with lenses that are wider than 90mm and are ideal for all lenses that are not F/2.8's.
This product is brand new, factory fresh and includes full manufacturer's warranty
Includes 6 Year Tamron USA Authorized Dealer Warranty