diff --git a/src/UsgsAstroFrameSensorModel.cpp b/src/UsgsAstroFrameSensorModel.cpp
index bb93473a7e523a595fe8dcb60bba562eabab21d8..6116a18dbb58bb9e28483c43bba7dfa2228210da 100644
--- a/src/UsgsAstroFrameSensorModel.cpp
+++ b/src/UsgsAstroFrameSensorModel.cpp
@@ -206,8 +206,8 @@ csm::ImageCoord UsgsAstroFrameSensorModel::groundToImage(
 
   //Convert distorted mm into line/sample
   double sample, line;
-  sample = m_iTransS[0] + m_iTransS[1] * distortedx + m_iTransS[2] * distortedx + m_ccdCenter[0] - 0.5;
-  line =   m_iTransL[0] + m_iTransL[1] * distortedy + m_iTransL[2] * distortedy + m_ccdCenter[0] - 0.5;
+  sample = m_iTransS[0] + m_iTransS[1] * distortedx + m_iTransS[2] * distortedx + m_ccdCenter[0];
+  line =   m_iTransL[0] + m_iTransL[1] * distortedy + m_iTransL[2] * distortedy + m_ccdCenter[0];
 
   return csm::ImageCoord(line, sample);
 }
@@ -244,8 +244,8 @@ csm::EcefCoord UsgsAstroFrameSensorModel::imageToGround(const csm::ImageCoord &i
 
   //Convert from the pixel space into the metric space
   double optical_center_x, optical_center_y, x_camera, y_camera;
-  optical_center_x = m_ccdCenter[0] - 0.5;
-  optical_center_y = m_ccdCenter[1] - 0.5;
+  optical_center_x = m_ccdCenter[0];
+  optical_center_y = m_ccdCenter[1];
   y_camera = m_transY[0] + m_transY[1] * (lo - optical_center_y) + m_transY[2] * (lo - optical_center_y);
   x_camera = m_transX[0] + m_transX[1] * (so - optical_center_x) + m_transX[2] * (so - optical_center_x);
 
@@ -301,8 +301,8 @@ csm::EcefLocus UsgsAstroFrameSensorModel::imageToRemoteImagingLocus(const csm::I
                                                              csm::WarningList *warnings) const {
   // Find the line,sample on the focal plane (mm)
   // CSM center = 0.5, MDIS IK center = 1.0
-  double col = imagePt.samp - (m_ccdCenter[0] - 0.5);
-  double row = imagePt.line - (m_ccdCenter[1] - 0.5);
+  double col = imagePt.samp - (m_ccdCenter[0]);
+  double row = imagePt.line - (m_ccdCenter[1]);
   double focalPlaneX = m_transX[0] + m_transX[1] * col + m_transX[2] * col;
   double focalPlaneY = m_transY[0] + m_transY[1] * row + m_transY[2] * row;
 
diff --git a/tests/FrameCameraTests.cpp b/tests/FrameCameraTests.cpp
index e5bddd4d2296e7d7550fdc88f7e599a95ba53797..edfb857d8b4d38b51decddd1258b9acddcd91ce1 100644
--- a/tests/FrameCameraTests.cpp
+++ b/tests/FrameCameraTests.cpp
@@ -57,14 +57,14 @@ class FrameSensorModel : public ::testing::Test {
 
 //centered and slightly off-center:
 TEST_F(FrameSensorModel, Center) {
-   csm::ImageCoord imagePt(7.0, 7.0);
+   csm::ImageCoord imagePt(7.5, 7.5);
    csm::EcefCoord groundPt = sensorModel->imageToGround(imagePt, 0.0);
    EXPECT_NEAR(groundPt.x, 10.0, 1e-8);
    EXPECT_NEAR(groundPt.y, 0, 1e-8);
    EXPECT_NEAR(groundPt.z, 0, 1e-8);
 }
 TEST_F(FrameSensorModel, SlightlyOffCenter) {
-   csm::ImageCoord imagePt(7.0, 6.0);
+   csm::ImageCoord imagePt(7.5, 6.5);
    csm::EcefCoord groundPt = sensorModel->imageToGround(imagePt, 0.0);
    EXPECT_NEAR(groundPt.x, 9.80194018, 1e-8);
    EXPECT_NEAR(groundPt.y, 0, 1e-8);
@@ -73,28 +73,28 @@ TEST_F(FrameSensorModel, SlightlyOffCenter) {
 
 //Test all four corners:
 TEST_F(FrameSensorModel, OffBody1) {
-   csm::ImageCoord imagePt(14.5, -0.5);
+   csm::ImageCoord imagePt(15.0, 0.0);
    csm::EcefCoord groundPt = sensorModel->imageToGround(imagePt, 0.0);
    EXPECT_NEAR(groundPt.x, 0.44979759, 1e-8);
    EXPECT_NEAR(groundPt.y, -14.99325304, 1e-8);
    EXPECT_NEAR(groundPt.z, 14.99325304, 1e-8);
 }
 TEST_F(FrameSensorModel, OffBody2) {
-   csm::ImageCoord imagePt(-0.5, 14.5);
+   csm::ImageCoord imagePt(0.0, 15.0);
    csm::EcefCoord groundPt = sensorModel->imageToGround(imagePt, 0.0);
    EXPECT_NEAR(groundPt.x, 0.44979759, 1e-8);
    EXPECT_NEAR(groundPt.y, 14.99325304, 1e-8);
    EXPECT_NEAR(groundPt.z, -14.99325304, 1e-8);
 }
 TEST_F(FrameSensorModel, OffBody3) {
-   csm::ImageCoord imagePt(-0.5, -0.5);
+   csm::ImageCoord imagePt(0.0, 0.0);
    csm::EcefCoord groundPt = sensorModel->imageToGround(imagePt, 0.0);
    EXPECT_NEAR(groundPt.x, 0.44979759, 1e-8);
    EXPECT_NEAR(groundPt.y, 14.99325304, 1e-8);
    EXPECT_NEAR(groundPt.z, 14.99325304, 1e-8);
 }
 TEST_F(FrameSensorModel, OffBody4) {
-   csm::ImageCoord imagePt(14.5, 14.5);
+   csm::ImageCoord imagePt(15.0, 15.0);
    csm::EcefCoord groundPt = sensorModel->imageToGround(imagePt, 0.0);
    EXPECT_NEAR(groundPt.x, 0.44979759, 1e-8);
    EXPECT_NEAR(groundPt.y, -14.99325304, 1e-8);