January 9, 2006


Mr. David Slobotkin
Loan Officer
Susquehanna Patriot Bank
8000 Sagemore Drive, Suite 8101
Marlton, NJ 08053-3941

Dear David:

Thanks  for  providing the draft loan documents. I  appreciate  the
extra  effort that went into getting the drafts together  over  the
holidays.  However,  as  we  have  discussed  and  as  I  know  you
understand, the fact that they are form documents means  that  some
of  the  terms and conditions just don't fit for our situation  and
several  are inconsistent with the commitment letter. Consequently,
here  is  a  list  of  disclosures, clarifications,  and  up  front
agreements  that would become an attachment to the loan  documents.
Please  note that I have provided references to document  locations
to  make  it  easy to review this letter but the same changes  will
apply  to  any  similar  provisions located  other  places  in  the
documents.  If  you  and your colleagues are  comfortable  with  an
amenable  to what is set forth in this letter, please sign  in  the
place  indicated below, whereupon this letter will  constitute  and
amendment  to the loan documents. This letter applies to  the  loan
agreements dated 1-5-06 for the $462,378.40 principal amount  first
mortgage loan and the $200,000 line of credit.

  -     In  view  of  the  existing loan made by Citizens  Bank  of
     Massachusetts ("Citizens") to Optometrics Corporation, which is a
     wholly-owned subsidiary of Dynasil, the statements made in the
     first sentence under the heading "Miscellaneous Provisions  --
     Subsidiaries and Affiliates of Borrower" cannot be applied (see
     page 4 of the Business Loan Agreement). For all purposes,  the
     Borrower (or the Grantor) under the loan documents must refer only
     to Dynasil. In the same vein, the pledge of "all assets" of the
     Borrower as collateral cannot be deemed to include the stock of
     Optometrics. As per the commitment letter, the collateral for these
     loans only includes the operating assets used in Dynasil's New
     Jersey operations at its operation in West Berlin, NJ.

  -     Similarly, and as you are aware, Citizens currently  has  a
     second lien position on the New Jersey operating assets excluding
     the real estate. Although Citizens has agreed to subordinate that
     lien position to your first position in the collateral securing the
     mortgage loan, as per the commitment letter, Susquehanna Patriot
     will have a first and third position in those assets, with Citizens
     keeping its second position.  The Citizens loans also include a
     guarantee by Dynasil Corporation.

- -    Clearly, as to the mortgage loan, the Loan Proceeds will be
     used to repay the existing Premier Bank mortgage loan.
- -    As to the items listed under "Affirmative Covenants --
     Performance", we will comply to the extent that they are material
     (See Business Loan agreement page 2)
- -    We plan to comply with the covenant under "Affirmative
     Covenants -- Operations" by furnishing you with copies of documents
     or reports we file with the Securities and Exchange Commission
     (quarterly 10-QSB reports, annual 10-KSB reports, and any special
     filings that would be relevant to this provision).  (See Business
     Loan Agreement page 2).
- -    Dynasil has a corporate seal and will bring it to the closing
     to place a seal on the "Corporate Resolution to Borrow/ Grant
     Collateral" documents.
- -    As per the broad definition of "hazardous substances" in these
     documents, Dynasil has in the past and currently uses "hazardous
     substances" in its processes so we are unable to represent that we
     have never used "hazardous substances" as stated in statement 1 of
     the Hazardous Substances paragraph at the bottom of page 1 of the
     Business Loan Agreements, on page 2 of the Mortgage Agreement, and
     anywhere else where this disclosure may apply.  In addition, please
     reference the Phase 1 Environmental Site Assessment prepared for
     Susquehanna Patriot Bank dated 10/14/05 for a summary of
     disclosures of Dynasil's history and status regarding environmental
     matters regarding environmental language in all loan documents.



  Page 2                                     January 9, 2006

- -    In regard to the Litigation and Claims representation at the
     top of page two on the Business Loan Agreements, Dynasil was named
     in a California lawsuit along with approximately 20 other companies
     and we do not believe that an adverse outcome on this matter will
     have any material adverse effect on the company.  Please see item
     3, page 3 of Dynasil's 10-KSB report for fiscal year 2005 for more
     details.  The entire contents of that 10-KSB should be considered
     disclosures for the purpose of this letter.
- -    On page 2 of the Business Loan Agreements, it requires that
     annual statements be sent to the lender within 45 days and
     quarterly statements within 30 days.  Our current requirements with
     the SEC are to file reports within 90 days and 45 days
     respectively.  We will provide the statements as soon as they are
     available which should be within the SEC timing requirement but may
     not meet the timing in the Business Loan Agreement.
  -    Under "Negative Covenants -- Continuity of Operations" in the
     Business Loan Agreements, by this letter you are giving Dynasil
     approval to continue to pay dividends (since we currently have
     Preferred Stock where we are paying dividends) as long as the two
     financial covenants are being met.  Also under negative covenants,
     it requires your approval for acquisitions and other activities
     that are part of Dynasil's strategy to expand our company.  We
     recognize  that these activities will require the approval  of
     Susquehanna Patriot Bank and we are agreeing that approval would
     not be unreasonably withheld.

- -    Please provide us a copy of the full amortization schedule for
     the mortgage.

- -    In the Commercial Security Agreements, under "Grantor's
     Representations and Warranties With Respect to the Collateral --
     Notices to Lender", we propose to provide copies of our documents
     filed with the SEC. Further, and as you know, under that same
     heading, the provisions under "Transactions Involving Collateral"
     and "Title" are inconsistent with the Citizens loan to Optometrics.
- -    Both loan packages include Assignment of Leases and Rents
     documents and the Promissory Notes list Assignment of Leases and
     Rents as collateral.  We are disclosing here that there are no
     leases and rents in New Jersey. This also relates to some
     provisions in the Mortgages.


Sincerely,




/s/Craig T. Dunham
President and CEO


Susquehanna  Patriot  Bank acknowledges and agrees  that  the  loan
documents  referred to above will be deemed amended to  the  extent
inconsistent  with the foregoing letter and also  acknowledges  the
disclosures and clarifications in this letter.


/s/   David  Slobotkin                  January 5, 2006
David Slobotkin, Loan Officer             Date