Thread: Sigma 500 IF and no IF
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Old 22-10-07, 18:23
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Michael Hogan Michael Hogan is offline  
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Location: Wicklow, Ireland
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Default Sigma 500 IF and no IF
What is the difference between a Sigma 500mm f4.5 APO EX DG HSM and a Sigma 500mm f4.5 APO EX DG HSM IF - and don't say 'IF'

Thanks

Michael
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