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old iron (and fiberglass) from Road America today -
600mm f/4.0 with TC-16A, shot at f5.6 1/400s ISO 200
600mm f/4.0 with TC-16A, shot at f5.6 1/400s ISO 640
600mm f/4.0 with TC-16A, shot at f11 1/400s ISO 640
After reviewing a lot of these TC-16A shots, I have to say that on the 600mm, it really drops the quality quite a bit unless the light is very good and you can shoot f/8 or higher, but even then the corners are very soft and you get other artifacts in the finer detail that are impossible to correct. Fringing is pretty extreme compared to the plain 600mm as well. In fact, I am not very happy with the amount of correction I have to apply with the plain 600mm at times, but then I guess that's why I can buy four of these lenses for the price of a 2013 600mm. At least in CS6 I can correct it quite well, 95% of it at least.