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It is possible to create a custom SIFT descriptor extractor:

SIFT siftDetectorExtractor = SIFT(200, 3, 0.04, 15, 1.6);

Mat logo = imread("logoName.jpg");

vector<KeyPoint> keyPoints;
Mat sifts;
siftDetectorExtractor(logo, Mat(), keyPoints, sifts);

or use the detector-class:

Ptr<FeatureDetector> detector = Ptr<FeatureDetector>( new SIFT( <your arguments> ) );