Sigma Questions

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I have a question regarding camera lenses. Is a Sigma 30mm F1.4 DC DN lens a better purchase....

...than a 16-50mm & 55-210mm Zoom Lens bundle? These lenses are the same price and I do not know which is better. And if you know what are the ...

0 answers | | Open

How to calculate: ∑(.60*5260.25)+∑(.67*2850)?

How does the sigma notation in front affect the equation inside the parenthesis?

0 answers | | Open

Will a Sigma 24-105 f/4 dg os hsm art lense work on a Canon 60D?I realize this is a full frame...

... lens. I just can't find out if it will fit this camera?

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