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12-26-2015, 02:51 PM   #1
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Sigma Zoom Master Auto 35 - 70mm 1:3.5~4.5

i have A K50 and have just got a sigma zoom master auto 35/70 mm 1:3.5-4.5 lens.when i put it on my camera i have the aperture value come up as f- - ?
how can i get it to work ??


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