EXHIBIT 32.2*

                            CERTIFICATION PURSUANT TO
                                 18 U.S.C. 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Cognex Corporation (the "Company") hereby certifies
that the Company's Annual Report on Form 10-K for the year ended December 31,
2004 (the "Report"), as filed with the Securities and Exchange Commission on the
date hereof, fully complies with the requirements of Section 13(a) or 15(d), as
applicable, of the Securities Exchange Act of 1934, as amended, and that the
information contained in the Report fairly presents, in all material respects,
the financial condition and results of operations of the Company.

   Date:  March 11, 2005

                                          /s/ Richard A. Morin
                                          ------------------------------------
                                          Richard A. Morin
                                          Senior Vice President of Finance,
                                          Chief Financial Officer, and Treasurer
                                          (principal financial officer)

* This certification shall not be deemed "filed" for purposes of Section 18 of
the Securities Exchange Act of 1934, or otherwise subject to the liability of
that section, nor shall it be deemed to be incorporated by reference into any
filing under the Securities Act of 1933 or the Securities Exchange Act of 1934.