dirty air filter
{"Image Make": "NIKON CORPORATION", "Image Model": "NIKON D300", "Image Orientation": "Horizontal (normal)", "Image XResolution": "9/1250", "Image YResolution": "9/1250", "Image ResolutionUnit": "Not Absolute", "Image Software": "Adobe Photoshop CS5.1 Windows", "Image DateTime": "2013:09:01 01:31:09", "Image ExifOffset": "218", "EXIF ExposureTime": "1/250", "EXIF FNumber": "28/5", "EXIF ExposureProgram": "Manual", "EXIF ISOSpeedRatings": "100", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2013:08:31 22:32:54", "EXIF DateTimeDigitized": "2013:08:31 22:32:54", "EXIF ShutterSpeedValue": "7217/906", "EXIF ApertureValue": "4946/995", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "3", "EXIF SubjectDistance": "3/2", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Flash", "EXIF Flash": "Flash did not fire", "EXIF FocalLength": "70", "EXIF SubSecTimeOriginal": "43", "EXIF SubSecTimeDigitized": "43", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "617", "EXIF ExifImageLength": "345", "EXIF SensingMethod": "One-chip color area", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Manual Exposure", "EXIF WhiteBalance": "Manual", "EXIF DigitalZoomRatio": "1", "EXIF FocalLengthIn35mmFilm": "105", "EXIF SceneCaptureType": "Standard", "EXIF GainControl": "None", "EXIF Contrast": "Normal", "EXIF Saturation": "Normal", "EXIF Sharpness": "Normal", "EXIF SubjectDistanceRange": "0", "EXIF LensSpecification": "[24, 70, 14/5, 14/5]", "EXIF LensModel": "24.0-70.0 mm f/2.8"}