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Brian G
Guest
I have recently started taking pictures at a local dirt track. I use a digital rebel xti and a sigma DG 70-300 f/4-5.6 lens. As the day gets darker into the night I notice that the lens has a hard time autofocusing. So my question is do I need a better lens to catch the fast action of the cars as its gets darker out. Or do I need a really good flash unit to help keep the photos from becoming blurry. I'm new to the photography world so any help would be much appreciated. Thanks