Which 70-300 For K7?

photo_DAD

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I am stuck in trying to choose a zoom for my k7. It is between:

Pentax 55-300 f/4-5.8 ED
Sigma 70-300 f/4-5.6 APO DG Macro Autofocus
Sigma 70-300 f/4-5.6 DG OS Telephoto Zoom

PLease explain your choice. Will the sigma with the Macro be as sharp at 300 as the others? My other lens is Pentax 18-55. Thank you
 

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