1. Anamorphotic front lens attachment for a projection ground objective with at least one frontal operational group (1), which is axially movable for the purpose of focusing, and a rear fixed optical operational group (2), and that the frontal optical operational group (1) is accommodated in an inner cylindrical frame (3), and the rear optical operational group (2) is accommodated in a fixed outer cylindrical frame (4), and the inner cylindrical frame (3) is telescopically displaceable in the outer cylindrical frame (4), characterized in that the means (5, 6) for displacement of the inner cylindrical frame (3) in the outer cylindrical frame (4) extent axially and are set into a wall section of the inner frame (3) and are operated from the front of the front lens attachment.

2. Anamorphotic front lens attachment according to Claim 1, characterized in that a push-pull arrangement (5, 6) which is inserted into the inner frame (3) is provided as a means of displacement of the inner frame (3) in the outer frame (4).

3. Anamorphotic front lens attachment according to Claim 2, characterized in that the push-pull arrangement is composed of a movement screw (5) and an internal thread set onto the outer frame (4) which is operational in conjunction with the external thread of a shaft of the adjustment screw (5).

4. Anamorphotic front lens attachment according to Claim 3, characterized in that the internal thread which co-operates with the external thread of the adjustment screw (5) is a part of a threaded nut (6) which is attached to the outer frame (4).

5. Anamorphotic front lens attachment according to Claim 3 or 4, characterized in that the adjustment screw (5) is set through a bore (11) axially into the inner frame (3) and extends with its shaft into a space which is formed by an external cutout (7) in the inner frame (3) and by an internal bore (8) in the external frame (4), and that this area also accommodates the internal thread (threaded nut 6) which is set onto the external frame (4).

6. Anamorphotic front lens attachment according to one of Claims 3 to 5, characterized in that the adjustment screw (5) is axially mounted on the inner frame (3) by means of a safety ring (9).

7. Anamorphotic front lens attachment according to one of Claims 3 to 6, characterized in that the external thread of the shaft of the adjustment screw (5) and the internal thread (threaded nut 6) set onto the external frame (4) are designed to be hard to move.

9. Anamorphotic front lens attachment according to Claim 8, characterized in that an arresting screw (12), which is set into the inner frame (3) and which is in operational contact with the external thread of its shaft by means of a clamping element (15) which is forced to establish an arrest towards the external frame (4), serves as an arresting means of the inner frame (3) towards the outer frame (4).

10. Anamorphotic front lens attachment according to Claim 9, characterized in that the clamping element (15) is forced between the external (4) and the internal frame (3).

11. Anamorphotic front lens attachment according to
Claim 9 or 10, characterized in that the clamping
element (15) comprises an internal thread which is
operationally connected to the external thread of
the shaft of the arresting screw (12).

12. Anamorphotic front lens attachment according to
one of Claims 9 to 11, characterized in that the
arresting screw (12) is axially set through a bore
(14) into the internal frame (3) and extends with its
shaft into a space which is formed by an external
cutout (13) in the internal frame (3) and by the inner
bore (8) of the outerframe (4), and that the clamping
element (15) is seated in said space on the end of
the arresting screw (12).

13. Anamorphotic front lens attachment according to Claim 12, characterized in that the clamping element (15) with a non-arrested front lens attachment is seated with play towards the inner frame (3) and towards the outer frame (4) on the shaft of the arresting screw (12).

14. Anamorphotic front lens attachment according to one of Claims 9 to 13, characterized in that the clamping element (15) is a threaded nut.

15. Anamorphotic front lens attachment according to Claim 14, characterized in that the front end of the clamping element (15) is slanted towards the optical axis and seated on a corresponding slanted surface of the outer cutout (13) of the inner frame (3).

16. Anamorphotic front lens attachment according to one of Claims 1 to 15 or 8 to 15, characterized in that the means (5, 6) for displacement of the inner frame (3) in the outer frame (4) are arranged, relative to the vertical, in the lateral (horizontal) area of the inner frame (3) and the outer frame (4).

( 2 )