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Why incorrect focal length when using a TC14EII?

t_jones

Laurel, US
691 posts

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t_jones Silver Member Nikonian since 05th Oct 2006
Wed 08-May-13 08:19 PM

Out of curiosity, I was wondering whether this is typical behavior. I bought a used 200-400mm VR from another Nikonian and just purchased a used TC14EII from KEH. The teleconverter just arrived so I was testing it out before heading out in the field. When taking photos with the 200-400mm lens zoomed all the way to 400 mark, my camera (D300) reports an effective focal length of 550mm. By my calculations 400 * 1.4 = 560. When I try the teleconverter with my 70-200mm VR, the D300 reports 280mm effective focal length when the lens is zoomed to 200mm setting.

Is the discrepancy (only a reported 10mm difference) anything to worry about? I have checked that the 200-400mm is recording 400mm to the EXIF when zoomed to that setting.

Thanks in advance,
Tim

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