diff --git a/DeviceAdapters/Aravis/AravisCamera.cpp b/DeviceAdapters/Aravis/AravisCamera.cpp
index 7c740b3d3..ad492ba33 100644
--- a/DeviceAdapters/Aravis/AravisCamera.cpp
+++ b/DeviceAdapters/Aravis/AravisCamera.cpp
@@ -172,7 +172,7 @@ void AravisCamera::AcquisitionCallback(ArvStreamCallbackType type, ArvBuffer *cb
     md.put(MM::g_Keyword_Metadata_ROI_X, CDeviceUtils::ConvertToString((long)img_buffer_width));
     md.put(MM::g_Keyword_Metadata_ROI_Y, CDeviceUtils::ConvertToString((long)img_buffer_height));
     md.put(MM::g_Keyword_Metadata_ImageNumber, CDeviceUtils::ConvertToString(counter));
-    md.put(MM::g_Keyword_Meatdata_Exposure, exposure_time);
+    md.put(MM::g_Keyword_Metadata_Exposure, exposure_time);
     md.put(MM::g_Keyword_PixelType, pixel_type);
     
     // Pass data to MM.
diff --git a/DeviceAdapters/Basler/BaslerPylonCamera.cpp b/DeviceAdapters/Basler/BaslerPylonCamera.cpp
index c6403320e..c0b71a755 100644
--- a/DeviceAdapters/Basler/BaslerPylonCamera.cpp
+++ b/DeviceAdapters/Basler/BaslerPylonCamera.cpp
@@ -2131,7 +2131,7 @@ void CircularBufferInserter::OnImageGrabbed(CInstantCamera& /* camera */, const
 	md.put(MM::g_Keyword_Metadata_ROI_X, CDeviceUtils::ConvertToString((long)ptrGrabResult->GetWidth()));
 	md.put(MM::g_Keyword_Metadata_ROI_Y, CDeviceUtils::ConvertToString((long)ptrGrabResult->GetHeight()));
 	md.put(MM::g_Keyword_Metadata_ImageNumber, CDeviceUtils::ConvertToString((long)ptrGrabResult->GetImageNumber()));
-	md.put(MM::g_Keyword_Meatdata_Exposure, dev_->GetExposure());
+	md.put(MM::g_Keyword_Metadata_Exposure, dev_->GetExposure());
 	// Image grabbed successfully?
 	if (ptrGrabResult->GrabSucceeded())
 	{
diff --git a/DeviceAdapters/DahengGalaxy/ClassGalaxy.cpp b/DeviceAdapters/DahengGalaxy/ClassGalaxy.cpp
index 55414a544..a06cfd0bf 100644
--- a/DeviceAdapters/DahengGalaxy/ClassGalaxy.cpp
+++ b/DeviceAdapters/DahengGalaxy/ClassGalaxy.cpp
@@ -1863,7 +1863,7 @@ void CircularBufferInserter::DoOnImageCaptured(CImageDataPointer& objImageDataPo
     md.put(MM::g_Keyword_Metadata_ROI_X, CDeviceUtils::ConvertToString((long)objImageDataPointer->GetWidth()));
     md.put(MM::g_Keyword_Metadata_ROI_Y, CDeviceUtils::ConvertToString((long)objImageDataPointer->GetHeight()));
     md.put(MM::g_Keyword_Metadata_ImageNumber, CDeviceUtils::ConvertToString((long)objImageDataPointer->GetFrameID()));
-    md.put(MM::g_Keyword_Meatdata_Exposure, dev_->GetExposure());
+    md.put(MM::g_Keyword_Metadata_Exposure, dev_->GetExposure());
     // Image grabbed successfully ?
     if (objImageDataPointer->GetStatus()== GX_FRAME_STATUS_SUCCESS)
     {
@@ -2160,4 +2160,4 @@ void ClassGalaxy::SaveRaw(CImageDataPointer& objCImageDataPointer, const std::st
         ::WriteFile(hFile, pbuffer, dwImageSize, &dwBytesRead, NULL);
         CloseHandle(hFile);
     }
-}
\ No newline at end of file
+}
diff --git a/DeviceAdapters/Ximea/XIMEACamera.cpp b/DeviceAdapters/Ximea/XIMEACamera.cpp
index 1c9a3e003..d4410ef0a 100644
--- a/DeviceAdapters/Ximea/XIMEACamera.cpp
+++ b/DeviceAdapters/Ximea/XIMEACamera.cpp
@@ -798,7 +798,7 @@ int XimeaCamera::InsertImage()
 	// Important:  metadata about the image are generated here:
 	Metadata md;
 	double exp_time = (double)image.GetExpTime() / 1000;
-	md.put(MM::g_Keyword_Meatdata_Exposure, CDeviceUtils::ConvertToString(exp_time));
+	md.put(MM::g_Keyword_Metadata_Exposure, CDeviceUtils::ConvertToString(exp_time));
 	md.put(MM::g_Keyword_Elapsed_Time_ms, CDeviceUtils::ConvertToString((timeStamp - sequenceStartTime_).getMsec()));
 	md.put(MM::g_Keyword_Metadata_ImageNumber, CDeviceUtils::ConvertToString(imageCounter_));
 	md.put(MM::g_Keyword_Metadata_ROI_X, CDeviceUtils::ConvertToString((long)roiX_));
@@ -1742,4 +1742,4 @@ int XiSequenceThread::svc(void) throw()
 	return ret;
 }
 
-///////////////////////////////////////////////////////////////////////////////
\ No newline at end of file
+///////////////////////////////////////////////////////////////////////////////
diff --git a/MMDevice/MMDeviceConstants.h b/MMDevice/MMDeviceConstants.h
index 62aa53ce6..397f2369a 100644
--- a/MMDevice/MMDeviceConstants.h
+++ b/MMDevice/MMDeviceConstants.h
@@ -144,7 +144,7 @@ namespace MM {
 
    // image annotations
    const char* const g_Keyword_Metadata_CameraLabel = "Camera";
-   const char* const g_Keyword_Meatdata_Exposure    = "Exposure-ms";
+   const char* const g_Keyword_Metadata_Exposure    = "Exposure-ms";
    const char* const g_Keyword_Metadata_Score       = "Score";
    const char* const g_Keyword_Metadata_ImageNumber = "ImageNumber";
    // Removed: g_Keyword_Metadata_StartTime         = "StartTime-ms";