Sigma 70-300mm vs Pentax 55-300mm
I have the Sigma 70-300mm (non APO) and am reasonably happy with it. However, I just got the K7 and there is a rebate for the 55-300mm.
Does Pentax 55-300mm offer a significant quality increase over the Sigma 70-300mm (non APO)? It's about $200 more for it, but if the IQ is far superior, then I would want to upgrade, especially with the rebate in mind.
Also, does anyone know if a TC is available for the Pentax 55-300mm? Preferably one that I could still us AF with?
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