The projection objective

A projection lens having a variable focal length, preferably for an image forming mirror matrix or a reflective and / or transmission LCD, said projection objective comprising an optical axis disposed in a common lens on the three groups (2) (G1, G2, G3), wherein starting from the side facing the projection screen (1), the first lens group (G1) and for focusing the second lens group (G2) for changing the position of a variable focal length are arranged in the light shaft (2), and the third lens group (G3) is fixed. According to the present invention satisfies the following conditions: 1.0hmax <dG2-G3 <1.5hmax and s≤10mm, where hmax is the maximum height of the object, dG2-G3 is a lens group (G2) at the first position and the lens group (G3) of distance, s is the object side intercept.