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p.1 #7 · p.1 #7 · Nikkor 180 2.8 and 1.4 or 2 x teleconvertors | |
I did the exact test you are asking for just last week with a Tamron 1.4x TC, which as far as I know is the same as the Kenko. Be aware though, that there are two versions, one cheap and one slightly more expensive. Mine is "Tamron SP AF Tele-Converter" "140F-FNs 1.4x". It comes in a red an white box. If I remember correctly, the cheaper one comes in a blue and white or green and white box.
Sharpness:
f/2.8 Good center sharpness, acceptable edges and corners.
f/4.0 Very good center sharpness, good edges and acceptable corners.
f/5.6 Excellent center sharpness, and almost as good edges. Corners very acceptable.
Contrast is fine at all apertures, but better when stopped down. If you shoot RAW, the new anti-haze filter in ACR is excellent for increasing contrast, particularly if the image is slightly over exposed. The 180/2.8 is indeed a very nice lens, and the compact size makes it an excellent travel companion. The fact that it works well with the Tamron TC makes it even more versatile. The Tamron works well with screw drive lenses as well as AF-S lenses.
As for the mentioned Nikkor 300mm f/4 AF (not AF-S), that lens performs very badly with teleconverters. I've tried it, and my old 500mm f/8 Reflex was sharper with more contrast.
I think this is the one I have, except that mine is white:
http://www.bhphotovideo.com/c/product/185152-REG/Tamron_AF14PN700_1_4x_SP_Pro_Teleconverter.html
Edit:
I forgot to say; I use this combo on a D810. On cameras with less MP, it will obviously work even better.
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