diff --git a/autotests/propertyinfotest.cpp b/autotests/propertyinfotest.cpp
--- a/autotests/propertyinfotest.cpp
+++ b/autotests/propertyinfotest.cpp
@@ -132,6 +132,8 @@
         { Property::PhotoGpsLongitude,      true,  13.5,                    QStringLiteral("13.5") + QChar(0x00B0)},
         { Property::PhotoExposureTime,      true,  0.0015625,               QStringLiteral("0.00156")},
         { Property::PhotoExposureBiasValue, true,  0.3333333,               QStringLiteral("0.333")},
+        { Property::PhotoFNumber,           true,  4.0,                     QStringLiteral("f/4")},
+        { Property::PhotoFNumber,           true,  2.8,                     QStringLiteral("f/2.8")},
         { Property::ReplayGainAlbumGain,    true,  -9.90,                   QStringLiteral("-9.9")},
         { Property::ReplayGainAlbumPeak,    true,  1.512,                   QStringLiteral("1.51")},
         { Property::ReplayGainAlbumGain,    true,  10.44,                   QStringLiteral("10.4")},
diff --git a/src/formatstrings.cpp b/src/formatstrings.cpp
--- a/src/formatstrings.cpp
+++ b/src/formatstrings.cpp
@@ -162,3 +162,8 @@
 {
     return i18nc("Aspect ratio, normalized to one", "%1:1", QLocale().toString(round(value.toDouble() * 100) / 100));
 }
+
+QString FormatStrings::formatAsFNumber(const QVariant& value)
+{
+    return i18nc("F number for photographs", "f/%1", QLocale().toString(value.toDouble(), 'g', 2));
+}
diff --git a/src/formatstrings_p.h b/src/formatstrings_p.h
--- a/src/formatstrings_p.h
+++ b/src/formatstrings_p.h
@@ -53,6 +53,8 @@
 
     static QString formatAspectRatio(const QVariant& value);
 
+    static QString formatAsFNumber(const QVariant& value);
+
 };
 
 }
diff --git a/src/propertyinfo.cpp b/src/propertyinfo.cpp
--- a/src/propertyinfo.cpp
+++ b/src/propertyinfo.cpp
@@ -237,7 +237,7 @@
             d->name = QStringLiteral("photoApertureValue");
             d->displayName = i18nc("@label EXIF", "Photo Aperture Value");
             d->valueType = QVariant::Double;
-            d->formatAsString = &FormatStrings::formatDouble;
+            d->formatAsString = &FormatStrings::formatAsFNumber;
             break;
 
         case Property::PhotoDateTimeOriginal:
@@ -271,7 +271,8 @@
         case Property::PhotoFNumber:
             d->name = QStringLiteral("photoFNumber");
             d->displayName = i18nc("@label EXIF", "Photo F Number");
-            d->valueType = QVariant::Int;
+            d->valueType = QVariant::Double;
+            d->formatAsString = &FormatStrings::formatAsFNumber;
             break;
 
         case Property::PhotoFocalLength: