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Bob,
Sorry for the delay in posting these.
These were captured on the 5th of February.
This is the same image, one has been pushed by 1 stop, the other by 2 stops.
Canon EOS 5D Mark III, Canon EF 70-200mm f/2.8L II IS USM, Canon EF 1.4x Extender
10s f/4.0 @ 280.0mm iso3200
The images are purely to show how little this extender vignettes. Any residual vignetting can easily be removed by using the in-built Peripheral Illumination Correction (in Digital Photo Professional, applied to the RAW), or by flat fielding.
I hope this helps, somewhat.
H
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