APS-C soccer - Sigma 70-200mm f/2.8 APO EX VS Sigma 100-300mm f/4

Started May 19, 2014 | Discussions thread
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PeterDejmek New Member • Posts: 6
APS-C soccer - Sigma 70-200mm f/2.8 APO EX VS Sigma 100-300mm f/4

Hello.

I wanna shoot soccer. Normal size or playground, 17 and 18 years old boys. I can sit/stand alongside line and my camera has APS-C sensor (1.5 crop factor..its Pentax K20D).

I will shoot in daylight but sometimes its overcast here.

Should I buy 70-200mm f/2.8 or 100-300mm f/4? I can buy them for same price (70-200mm is selling with 2x TC APO EX also)

Sigma 70-200mm f/2.8 APO EX - Can I shoot on 2.8 and have no problem with AF? I am afraid that it will be too short (105-300mm f/4.2 with crop factor).

Sigma 100-300 f/4 - is f/4 enough with crop factor for nice narrow DOF? (f6 with crop factor?? - am I understand with this right?)

Please, help me solve this problem.

Pentax K20D
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