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You used F1,8 Iso 800 and 1/125

so you can`t go up in F the Canon 1000 can ISO 1600 but I doubt that the Color noise will be acceptable. the sweet spot for rc car photos is about 1/400to 1/800.

For comparison: Canon 350D EF-S 55-250 EX430 in High speed mode, F5, ISO1600, 1/320

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