new sigma lens - what's the point

Started Nov 12, 2009 | Discussions thread
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maxT Junior Member • Posts: 49
Re: Other Issues

dlkeller wrote:

Is it HSM? Price? Weight and Size? Image Quality?

yup... IQ is a big factor or AF speed... on my old 70-300 Sigma (non APO) the best IQ/resolution was at F10-F13 with acceptable F9 (on KM 5D)...

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