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SGosselin: 70-200f4L Vs 100 f2.8 macro
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SGosselin: Impact of (very) bad UV filter
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SGosselin: 200+ (bad) uv filter
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SGosselin: Canon 70-200 f4L Vs sigma 120-400 f4.5-5.6 OS HSM @ f5.6
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SGosselin: compar_f8