general wattmeter

Camera：Nikon D300, Lens：Tokina AT-X12-24mm F4DX
Exif：Aperture priority mode, 0EV, ISO= 200, SS= 1/640sec, f=4, Focus distance= 14mm, No flash
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Camera：Nikon D300, Lens：Tokina AT-X12-24mm F4DX
Exif：Aperture priority mode, 0EV, ISO= 200, SS= 1/100sec, f=4, Focus distance= 24mm, No flash
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Camera：Nikon D300, Lens：AF-S DX VR Nikkor ED 18-200mm F3.5-5.6G
Exif：Aperture priority mode, 0EV, ISO= 280, SS= 1/30sec, f=6.3, Focus distance= 50mm, No flash