Exhibit 16.1



June 10, 2003


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

Commissioners:

We have read the statements made by Cognex Corporation (copy attached), which we
understand will be filed with the Commission, pursuant to Item 4 of Form 8-K, as
part of the Company's Form 8-K report dated June 5, 2003. We agree with the
statements concerning our Firm in such Form 8-K.

Very truly yours,




/s/ PricewaterhouseCoopers LLP