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I too am absolutely delighted, but have a question. Having purchased the Sigma 17-70 lens, I find that it does not always go below f4.5, ie not to its maximum 2.8: what could be the reason for this? I have cleaned the contacts, but find that the only solution is to remove, fit another lens, vary the aperture, then refit the Sigma. I know it could be either a lens or a body fault, how would I go about identifying which it is?
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