UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 25, 2005


                       CHASE MORTGAGE FINANCE CORPORATION
       (Issuer in respect of Chase Mortgage Finance Trust, Series 2005-S1)
                              (the "Certificates")
       -------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


Delaware                              333-110968-04        52-1495132
----------------------------          -------------        --------------------
(State or other jurisdiction          (Commission          (IRS Employer
 of incorporation)                     File Number)         Identification No.)


194 Wood Avenue South, 3rd Floor, Iselin, NJ           08830
--------------------------------------------           ----------
(Address of principal executive offices)               (Zip Code)


Registrant's telephone number, including area code:  (732) 205-0600


--------------------------------------------------------------
(Former name or former address, if changed since last report.)

Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

|_|   Written  communications  pursuant to Rule 425 under the Securities Act (17
      CFR 230.425)

|_|   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)

|_|   Pre-commencement  communications  pursuant  to  Rule  14d-2(b)  under  the
      Exchange Act (17 CFR 240.14d-2(b))

|_|   Pre-commencement  communications  pursuant  to  Rule  13e-4(c)  under  the
      Exchange Act (17 CFR 240.13e-4(c))
<PAGE>

Section 8 - Other Events

Item 8.01 Other Events.

On or about July 25, 2005, Chase Mortgage Finance  Corporation (the "Depositor")
made the  distributions  to holders of its Mortgage  Pass-Through  Certificates,
Series  2005-S1 as  contemplated  by the Pooling and Servicing  Agreement  among
Chase Mortgage Finance Corporation, JPMorgan Chase Bank, N.A. and Wachovia Bank,
N.A., dated as of April 1, 2005 (the "Pooling and Servicing Agreement").

Copies of the  Certificateholders'  Reports with  respect to such  distributions
delivered  pursuant to Section 6.02 of the Pooling and  Servicing  Agreement are
being filed as exhibits to this Current Report on Form 8-K.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(c) Exhibits.

Exhibit No.      Description
-----------      -----------

   99.1          Monthly Reports with respect to the July 25, 2005 distribution.
<PAGE>

                                   SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                       JPMORGAN CHASE BANK
                                       (f/k/a "The Chase Manhattan Bank"),
                                       As Paying Agent, on behalf of
                                       Chase Mortgage Finance Corp.


                                       By: /s/ Andrew M. Cooper
                                           -------------------------------
                                           Name:  Andrew M. Cooper
                                           Title: Assistant Vice President
                                           Date:  August 3, 2005
<PAGE>

                                INDEX TO EXHIBITS

Exhibit No.      Description
-----------      -----------

   99.1          Monthly Reports with respect to the distribution to
                 certificateholders on July 25, 2005.
{"company-data": {"conformed-name": "Chase Mortgage Finance Trust Series 2005-S1", "cik": "0001324874", "assigned-sic": "6189", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "333-110968-04", "film-number": "051003034"}, "business-address": {"street1": "194 WOOD AVENUE SOUTH", "street2": "C/O A HARDY EUBANKS III", "city": "ISELIN", "state": "NJ", "zip": "08830", "phone": "7322050600"}, "mail-address": {"street1": "194 WOOD AVENUE SOUTH", "street2": "3RD FLOOR", "city": "ISELIN", "state": "NJ", "zip": "08830"}}
UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 25, 2005

                       CHASE MORTGAGE FINANCE CORPORATION
       (Issuer in respect of Chase Mortgage Finance Trust, Series 2005-S1)
                              (the "Certificates")
       -------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

Delaware                              333-110968-04        52-1495132
----------------------------          -------------        --------------------
(State or other jurisdiction          (Commission          (IRS Employer
 of incorporation)                     File Number)         Identification No.)

194 Wood Avenue South, 3rd Floor, Iselin, NJ           08830
--------------------------------------------           ----------
(Address of principal executive offices)               (Zip Code)

Registrant's telephone number, including area code:  (732) 205-0600

--------------------------------------------------------------
(Former name or former address, if changed since last report.)

Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

|_|   Written  communications  pursuant to Rule 425 under the Securities Act (17
      CFR 230.425)

|_|   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)

|_|   Pre-commencement  communications  pursuant  to  Rule  14d-2(b)  under  the
      Exchange Act (17 CFR 240.14d-2(b))

|_|   Pre-commencement  communications  pursuant  to  Rule  13e-4(c)  under  the
      Exchange Act (17 CFR 240.13e-4(c))
Section 8 - Other Events

Item 8.01 Other Events.

On or about July 25, 2005, Chase Mortgage Finance  Corporation (the "Depositor")
made the  distributions  to holders of its Mortgage  Pass-Through  Certificates,
Series  2005-S1 as  contemplated  by the Pooling and Servicing  Agreement  among
Chase Mortgage Finance Corporation, JPMorgan Chase Bank, N.A. and Wachovia Bank,
N.A., dated as of April 1, 2005 (the "Pooling and Servicing Agreement").

Copies of the  Certificateholders'  Reports with  respect to such  distributions
delivered  pursuant to Section 6.02 of the Pooling and  Servicing  Agreement are
being filed as exhibits to this Current Report on Form 8-K.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(c) Exhibits.

Exhibit No.      Description
-----------      -----------

   99.1          Monthly Reports with respect to the July 25, 2005 distribution.
SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                       JPMORGAN CHASE BANK
                                       (f/k/a "The Chase Manhattan Bank"),
                                       As Paying Agent, on behalf of
                                       Chase Mortgage Finance Corp.

                                       By: /s/ Andrew M. Cooper
                                           -------------------------------
                                           Name:  Andrew M. Cooper
                                           Title: Assistant Vice President
                                           Date:  August 3, 2005
INDEX TO EXHIBITS

Exhibit No.      Description
-----------      -----------

   99.1          Monthly Reports with respect to the distribution to
                 certificateholders on July 25, 2005.