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Vintage lens are total fucking garbage. They have no contrast, no resolution, are riddled with every aberration known to man. You should never use one as they will ruin every shot you ever take.
Speed boosters are total fucking garbage. They reduce resolution, flare obscenely, and add all kinds of aberrations to the image. You should NEVER use a speed booster.
Only NEW modern lenses mounted on modern full-frame sensors will provide an acceptable result. Quit being a poor fag, take out a second mortgage on your house, and buy PROPER NEW equipment. This is the only way you will ever get a good shot.