When mounting lenses via a teleconverter like the Canon 2x, does the EXIF metadata record this information somehow? Will the recorded focal length be adjusted by the camera or the extender? Is there a metadata flag that indicates the presence of the extender during shooting?
Answer
When I use a third party teleconverter with a Canon lens, the EXIF records the lens only in the Lens field, but the actual Av and Focal Length are correctly recorded.
The EXIF info below is from a shot taken at maximum aperture and focal length of an EF 70-200mm f/2.8 L IS II + Kenko C-AF 2X Teleplus Pro 300. As you can see the aperture is recorded as f/5.6 and the focal length as 400mm.
When a Canon extender is used, the EXIF data includes the extender in the lens data.
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