D5100 + Sigma 50-200 lens vignetting problem
you must use a thin filter.
for example Hoya Pro1:
but with the 18-1200 DX lens you may have vignetting al wide angle f/3.5 because of the construction of the lens.
D7000 + Sigma 17-70 OS HSM + Nikkor 70-300 VR + AF-S 35 1.8G + Yongnuo YN-467 + AF Macro Extension Tubes
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