EXHIBIT 5.1

SICHENZIA ROSS FRIEDMAN FERENCE LLP

61 Broadway, 32nd Floor

New York, NY 10006

Telephone: (212) 930-9700

Facsimile: (212) 930-9725

September 3, 2015

eMagin Corporation

2070 Route 52

Hopewell Junction NY 12533

Re: eMagin Corporation

Ladies and Gentlemen:

We have acted as special counsel to eMagin Corporation, a Delaware corporation (the “Company”), in connection with the sale through Crai-Hallum Capital Group LLC (“Craig-Hallum”) as the sales agent from time to time by the Company of shares (the “Shares”) of common stock of the Company, par value $0.001 per share (the “Common Stock”), up to an aggregate offering amount of $4,500,000, to be issued pursuant to that certain at-the-market sales agreement, dated September 3, 2015 (the “Sales Agreement”), by and between the Company and Craig-Hallum.

The Shares are included in a registration statement on Form S-3 under the Securities Act of 1933, as amended (the “Act”), filed with the Securities and Exchange Commission (the “Commission”) on June 25, 2014 (Registration No. 333-196720, the “Registration Statement”), a related base prospectus dated June 25, 2014 (the "Base Prospectus") and a prospectus supplement dated September 3, 2015 filed with the Commission pursuant to Rule 424(b) under the Act (the "Prospectus Supplement") (the Base Prospectus and the Prospectus Supplement are referred to herein together as the "Prospectus"). The term “Shares” shall include any additional shares of common stock registered by the Company pursuant to Rule 462(b) under the Act in connection with the offering contemplated by the Registration Statement. This opinion is being furnished in connection with the requirements of Item 601(b)(5) of Regulation S-K under the Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement or related Prospectus, other than as expressly stated herein with respect to the issue of the Shares.

We have reviewed such records, documents, agreements and certificates, and examined such questions of law, as we have considered necessary or appropriate to express the opinions set forth below. In making our examination of records, documents, agreements and certificates, we have assumed the authenticity of the same, the correctness of the information contained therein, the genuineness of all signatures, the authority of all persons entering and maintaining records or executing documents, agreements and certificates, and the conformity to authentic originals of all items submitted to us as copies (whether certified, conformed, photostatic or by other electronic means) of records, documents, agreements or certificates. In rendering our opinions, we have relied as to factual matters upon certificates of public officials and certificates and representations of officers of the Company. We are opining herein as to the General Corporation Law of the State of Delaware (the “DGCL”), and we express no opinion with respect to any other laws.

Subject to the foregoing and the other matters set forth herein, it is our opinion that, as of the date hereof, when the Shares shall have been duly registered on the books of the transfer agent and registrar therefor in the name or on behalf of the purchasers, and have been issued by the Company against payment therefor (not less than par value) in the circumstances contemplated by the Sales Agreement, the issue and sale of the Shares will have been duly authorized by all necessary corporate action of the Company, and the Shares will be validly issued, fully paid and nonassessable. In rendering the foregoing opinion, we have assumed that (i) the Company will comply with all applicable notice requirements regarding uncertificated shares provided in the DGCL and (ii) upon the issue of any of the Shares, the total number of shares of Common Stock issued and outstanding will not exceed the total number of shares of Common Stock that the Company is then authorized to issue under its Certificate of Incorporation, as amended.

This opinion is for your benefit in connection with the Registration Statement and may be relied upon by you and by persons entitled to rely upon it pursuant to the applicable provisions of the Act. We consent to your filing this opinion as an exhibit to the Company’s Form 8-K dated September 3, 2015 and to the reference to our firm in the Prospectus under the heading “Legal Matters.” In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.